JP7137739B2 - Method for suppressing bulla in plants, method for producing plants, and device for suppressing bulla in plants - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for suppressing bulla in plants, a method for producing plants, and a device for suppressing bulla in plants.

In the sale of plant seeds, the seeds to be sold are subject to quality control. Specifically, the germination rate is examined by extracting some seeds and raising seedlings (Non-Patent Documents 1 and 2). In addition, the appearance and color of the seedlings obtained from the seeds are visually inspected (Non-Patent Document 3).

Ministry of Agriculture, Forestry and Fisheries, ``Determining the method of indicating the germination rate based on the provisions of the Ordinance for Enforcement of the Seed and Seedling Law,'' 1989 Ministry of Agriculture, Forestry and Fisheries, "Standards for Production of Specified Seedlings", 2002 Ikuo Fukasawa, "Agricultural Technology System, Vegetable Edition, Diagnosis of Seedlings and Judgment of Additional Fertilization and Irrigation", 1997, +271 to +276

The present inventors found that when the light source used for raising seedlings from the seeds was changed from a fluorescent lamp to an LED (light emitting diode) lamp, blistering occurred in the resulting seedlings, particularly tomato plants. Found it. In addition, although the occurrence of blisters can be suppressed by irradiating with ultraviolet rays, ultraviolet rays have an adverse effect on the human body.

Therefore, the present invention provides a method for suppressing blistering in plants that enables visual quality inspection by including green light even when an LED lamp is used, and that can suppress the onset of blistering. With the goal.

In order to achieve the above object, the method for suppressing bullous disease in plants of the present invention (hereinafter also referred to as "suppression method") includes a first irradiation step of irradiating the plant with light,
the light includes blue light, green light and red light;
The ratio (L _R /L _B ) of the photon flux density of red light (L _R ) and the photon flux density of blue light (L _B ) satisfies the range of 0.6≦L _R /L _B ≦2.

The plant production method of the present invention (hereinafter also referred to as "production method") includes a growth step of irradiating the plant with light to grow,
The growth step is performed by the control method of the present invention.

The apparatus for suppressing bullous disease in plants of the present invention (hereinafter also referred to as "suppressor") comprises a first irradiation unit capable of irradiating a plant with blue light;
a second irradiation unit capable of irradiating plants with green light;
a third irradiation unit capable of irradiating a plant with red light;
a control unit that controls irradiation by the first irradiation unit, the second irradiation unit, and the third irradiation unit;
The control unit controls the photon flux density (L _R ) of red light emitted from the third irradiation unit during irradiation by the first irradiation unit, the second irradiation unit, and the third irradiation unit. and the photon flux density (L _B ) of the blue light emitted from the first irradiation unit (L _R /L _B ) satisfies the range of 0.6≦L _R /L _B ≦2 , to control the irradiation of the first irradiation unit and the third irradiation unit.

According to the present invention, even when an LED lamp is used, the presence of green light enables visual inspection of quality and suppresses the onset of blistering.

FIG. 1 is a schematic diagram showing an example of the suppression device of the present invention.

<Method for Suppressing Bullous Disease>
The method for suppressing bullous disease in plants of the present invention, as described above, includes the first irradiation step of irradiating the plant with light, the light includes blue light, green light and red light, and the photon of red light The ratio (L _R /L _B ) between the flux density (L _R ) and the photon flux density (L _B ) of blue light satisfies the range of 0.6≦L _R /L _B ≦2. The suppression method of the present invention is characterized in that L _R /L _B satisfies 0.6≦L _R /L _B ≦2, and other steps and conditions are not particularly limited.

As a result of intensive research, the present inventors have found that even when an LED lamp containing green light is used, although the mechanism is unknown, the photon flux density of red light (L _R ) and the photon flux density of blue light (L _B ) to a certain range, that is, by setting L _R /L _B to a range that satisfies 0.6 ≤ L _R /L _B ≤ 2, during plant growth, particularly during seedling raising The inventors have found that the occurrence of bullous disease can be suppressed, and have established the present invention. In the present invention, since the green light is included as a component of the irradiation light to the plant, the blue light and the red light irradiated together with the green light provide a whitish light color. Therefore, according to the present invention, visual quality inspection becomes possible, and occurrence of bullous disease in plants can be suppressed. Moreover, according to the present invention, by setting L _R /L _B to 0.6≦L _R /L _B ≦2, for example, a plant having a healthy seedling shape can be grown. Furthermore, according to the present invention, the occurrence of blisters can be suppressed by controlling L _R /L _B , so that, for example, ultraviolet irradiation is unnecessary. Therefore, according to the present invention, for example, plants can be grown in a safe environment that does not use ultraviolet rays.

According to the suppression method of the present invention, the occurrence of bullous disease can be suppressed, for example, when raising seedlings from plant seeds or growing adult plants from seedlings. Therefore, the suppression method of the present invention can also be regarded as a seedling raising method in which the occurrence of bulla is suppressed, or a plant growth method in which the occurrence of bulla is suppressed.

In the present invention, "healthy seedling" means, for example, a plant seedling that satisfies any one of the following (1) to (4), preferably a seedling that satisfies all of them.
(1) Soft and not elongated, hypocotyls, cotyledons and true leaves are moderately hard (2) Cotyledons and true leaves are widely spread (3) Leaf color is dark green and slightly glossy (4) Cotyledons Leaves and true leaves are thick and have clear veins

In the present invention, the plant is not particularly limited, and examples thereof include plants used in agriculture or gardening, such as agricultural plants. Examples of the agricultural plants include vegetables and flowers in the horticultural classification. Since the suppression method of the present invention can effectively suppress, for example, the blistering disease, the plant is preferably a tomato plant (tomato).

Examples of the vegetables include fruit vegetables, leafy stems, and root vegetables. The fruit vegetables include cereals such as corn; adzuki beans, kidney beans, peas, edamame, cowpeas, winged beans, fava beans, soybeans, jack beans, groundnuts, lentils, sesame seeds; Takanotsume, red pepper, white pepper, habanero, green pepper, paprika, colored green pepper, pumpkin, zucchini, cucumber, horned gourd, white cucumber, bitter gourd, red pepper, chayote, loofah, milkweed, okra, strawberry, watermelon, melon, Japanese melon; . The leaf stems include, for example, ice plant, Angelica keiskei, mustard, cabbage, watercress, kale, Japanese mustard spinach, salad greens, sunny lettuce, radish, lettuce, Shandong greens, perilla, chrysanthemum, junsai, shirona, seri, celery, taassai, radish ( Suzushiro), takana, chisha, bok choy, tsukena, rape blossoms, nozawana, Chinese cabbage, parsley, haruna, chard, spinach, hotokenoza, mizuna, green chickweed, chickweed, bovine chickweed, mibuna, mitsuba, Brussels sprouts, mulukhiya, leaf lettuce, arugula, lettuce , wasabina; leafy vegetables such as green onions, thin green onions, chives, Chinese chives, asparagus, udo, kohlrabi, Chinese cabbage, bamboo shoots, garlic, green onions, green onions, spring onions, stem vegetables such as onions; artichokes, broccoli, cauliflower, edible chrysanthemums, Flowering vegetables such as Nabana, Fukinoto and Japanese ginger; Sprouted vegetables such as sprouts, bean sprouts and radish sprouts; The root vegetables include, for example, potatoes such as sweet potato, taro, potato, Chinese yam (Japanese yam), and yam (yam, wild yam); , lotus root, lily root;

The above flowering plants include, for example, hollyhock, bouvardia, godetia, azalea, stock, habotan, lunaria, acidanthera, iris, gladiolus, California poppy, peperomia, calceolaria, snapdragon, torenia, primrose, cyclamen, hemlock, anthurium, calla, caladium, calamus , syngonium, spathiphyllum, dieffenbachia, philodendron, cacti, ajuga, cactorrano, salvia, begonia, curcuma, water lily, portulaca, violet, white lace flower, cetocleacea, purple omoto, purple dayflower, garden balsam, tsuno eggplant, petunia, physalis , carnation, dianthus, sekichiku, gypsophila, perennial gypsophila, mustrithria, guzmania, strelitzia, moss phlox, oleander, oleander, oleander, amaryllis, amaryllis, chrysanthemum, margaret, kunsilan, kirtanthus, daffodil, snowflake, tamasudare, nerine, hamaomoto, Eucharis, Licorice, Agave, Celosia, Sennichikou, Morning Glory, Evolvulus, Cleome, Geranium, Kalanchoe, Scabiosa, Sweet Pea, Lupine, Borage, Forget-me-not, Astilbe, Saxifrage, Agapanthus, Polygonum, Aloe, Ornithogalum, Omoto, Orizurran, Hosta, Black Lily, Gloriosa, Colchicum, Sansevieria, Sandersonia, Janobeard, Tulip, Tsurubachia, German Lily of the Valley, Dracaena, Tritherea, Narcolily, New Cyran, Fritillaria, Hyacinth, Hototogisu, Lily lily, Yabran, Lily, Alstroemeria, Ruscus, Cypripedium, Ebine, Oncidium, Cattleya, Korumanara, Birlan, Cymbidium, Cerosene, Dendrobium, Doritaenopsis, Nagoran, Paphiopedilum, Vanda, Birstekera, Phalaenopsis, Braunau, Miltonia, Exacum, Lisianthus, Gentian, Lantana, Rose, Sakura, Garve and the like. The flowering plant may be, for example, a plant whose leaves are used for admiration, and specific examples thereof include sakaki, cycad, fern, dracaena, haran, monstera, pothos, compactor, polyscious, jungle bush, liquorice, beargrass, pitosporum, and the like. is given.

In the present invention, the growth stage of the plant is not particularly limited, and examples thereof include seeds, germinated seeds that have germinated seeds, seedlings that have grown from the germinated seeds, and adults that have grown from the seedlings. Since the suppression method of the present invention can effectively suppress, for example, the bullous disease, the growth stage of the plant is preferably from the seed to the seedling, more preferably from the germinated seed to the seedling. The seedling means, for example, a plant after seeding germination and before planting.

In the present invention, the light includes visible light as its component, but may also include invisible light, ie, at least one of ultraviolet light and infrared light. Examples of the infrared rays include near infrared rays and far infrared rays. In the present invention, the "ultraviolet" means light having a wavelength of, for example, less than 400 nm. The "blue light" means, for example, light with a wavelength of 400 nm or more and less than 500 nm. The "green light" means, for example, light with a wavelength of 500 nm or more and less than 600 nm. The "red light" means, for example, light with a wavelength of 600 nm or more and less than 700 nm. The "near-infrared" means, for example, light with a wavelength of 700 nm or more and less than 780 nm. The "far-infrared rays" means, for example, light with a wavelength of 780 nm or longer.

In the present invention, "bullicular disease" means a physiological disorder in which, for example, non-pathogenic bumps occur on leaves, stems, and the like. When a plant suffers from bullous disease, for example, the plant develops blister-like bumps in the leaf tissue, and chloroplasts are removed, leading to a decrease in photosynthetic rate, growth inhibition, and withering.

In the present invention, "inhibition of bullous disease" may be used to mean, for example, suppression or prevention of occurrence (development) of bullous disease and suppression or termination of progression of symptoms of bullous disease.

The first irradiation step is a step of irradiating the plant with light. The first irradiation step may be performed, for example, once or multiple times. In the first irradiation step, the plant is irradiated with light continuously or discontinuously, and the former is preferred. The continuous irradiation can also be called continuous irradiation, for example. The discontinuous irradiation can also be called intermittent irradiation, for example.

The first irradiation step can be performed, for example, by using a light source and irradiating the plant with light emitted from the light source. As a specific example, the first irradiation step can be performed, for example, by irradiating the plant with light from a light source installed above the plant with the light projection direction directed downward.

Examples of the light source include a light source capable of emitting one or more of the blue light, the green light, and the red light. The light source is, for example, one or more. When there is one light source, the light source emits the blue light, the green light and the red light, and the blue light and the red light satisfy the aforementioned L _R /L _B. On the other hand, when there are a plurality of light sources, the light sources may be, for example, a combination of light sources that emit the blue light, the green light, or the red light. A plurality of light sources emitting at least one of them may be combined. As a specific example, the light source is a combination of a light source emitting the blue light, the green light, and the red light, a light source emitting the blue light, and a light source emitting the red light, a light source of white light, and the blue light. and a light source emitting the red light.

The light source emitting each color has, for example, a wavelength distribution over part or all of the wavelength region of each light, and preferably has a wavelength distribution over the entire wavelength region because the blistering disease can be effectively suppressed.

Examples of the light source that can be used include LEDs, fluorescent tubes, metal halide lamps, sodium lamps, halogen lamps, xenon lamps, neon tubes, inorganic electroluminescence, organic electroluminescence, chemiluminescence (chemiluminescence), lasers, and the like, but are preferably , LEDs. In addition, the light source may be used by passing through a spectral filter in order to irradiate desired light. Also, the light source may be a combination of different light emitting means.

The plant may be, for example, an isolated plant, a plant planted in the cultivation container or its seed, or a plant permanently planted in agricultural land such as a rice field or a field or its seed.

The photon flux density of the light (L _A ) is the photon flux density of the blue light (L _B ), the photon flux density of the green light (L _G ), and the photon flux density of the red light (L _R ). means the sum of In the first irradiation step, the photon flux density (L _A ) of the light is not particularly limited, and is, for example, 160 to 280 μmol m ⁻² s ⁻¹ , preferably 180 to 230 μmol m ⁻² s ^{− 1} .

In the first irradiation step, the photon flux density (L _B ) of the blue light is not particularly limited. The lower limit of L _B is not particularly limited, and is, for example, 45 μmol m ⁻² s ⁻¹ . The upper limit of L _B is not particularly limited, and is, for example, 120 μmol m ⁻² s ⁻¹ , and preferably 100 μmol m ⁻² s because the bullous disease can be effectively suppressed and seedlings can be grown into healthy plants. ⁻¹ , 80 μmol m ⁻² s ⁻¹ , more preferably 60 μmol m ⁻² s ⁻¹ . The range of L _B is, for example, 45 to 120 μmol m ⁻² s ⁻¹ , and is preferably 45 to 100 μmol m ⁻² s ⁻ because the blistering disease can be effectively suppressed and seedlings can be grown into healthy plants. ¹ , more preferably 45 to 80 μmol m ⁻² s ⁻¹ or 45 to 60 μmol m ⁻² s ⁻¹ .

In the first irradiation step, the photon flux density (L _G ) of the green light is not particularly limited. The lower limit of L _G is not particularly limited, and is, for example, 60 μmol m ⁻² s ⁻¹ , preferably 65 μmol m ⁻² s ⁻¹ . The upper limit of L _G is not particularly limited, and is, for example, 90 μmol m ⁻² s ⁻¹ , and is preferably 80 μmol m ⁻² s because the blistering disease can be effectively suppressed and seedlings can be grown into healthy plants. ^-1 . The range of L _G is, for example, 60 to 90 μmol m ⁻² s ⁻¹ , preferably 65 to 80 μmol m ⁻² s ⁻¹ .

In the first irradiation step, the photon flux density (L _R ) of the red light is not particularly limited. The lower limit of L _R is not particularly limited, and is, for example, 60 μmol m ⁻² s ⁻¹ . The upper limit of the L _R is not particularly limited, and is, for example, 110 μmol m ⁻² s ⁻¹ , and is preferably 80 μmol m ⁻² s because the bullous disease can be effectively suppressed and seedlings can be grown into healthy plants. ^-1 . The upper limit of L _{2 R} is, for example, 60 to 110 μmol m ⁻² s ⁻¹ , and preferably 60 to 80 μmol m ⁻² s ⁻¹ because the bullous disease can be effectively suppressed.

In the present invention, the photon flux density can be measured using a photon flux density measuring instrument. A light analyzer (model number: LA105, Nihon Ika Kikai Seisakusho Co., Ltd.) can be used as the measuring instrument. The photon flux density can be obtained by placing the light-receiving surface of the measuring device in the opposite direction of the cultivated ground (light irradiation direction), placing it in the center of the cultivated ground (for example, on the culture vessel), and measuring. . The light-receiving surface is arranged, for example, at a height of 2 to 2.5 cm with respect to the cultivation ground. A measuring instrument other than a light analyzer may be used as the measuring instrument. In this case, the photon flux density in the present invention is a value obtained by converting the measured value of another measuring instrument into the measured value of the light analyzer.

In the first irradiation step, the ratio of L _R to L _B (L _R /L _B ) is in the range of 0.6≦L _R /L _B ≦2, and the bullous disease is can be effectively suppressed and _seedlings can be _grown into healthy plants. It is more preferably in the range of 1≦L _R /L _B ≦1.4 because it can be suppressed and healthy plants can be raised.

In the first irradiation step, the ratio of _LR to _LG ( _LR / _LG ) is not particularly limited, and is, for example, in the range of 0.6 ≤ _LR /LG _≤ 1.6. , Since the above-mentioned bulla disease can be effectively suppressed and plant growth can be suppressed, the range of 0.8 ≤ L _R /L _G ≤ 1.4 is more preferable, and the bulla disease can be suppressed for a wider variety. It is in the range of 0.9≦L _R /L _G ≦1.1 because it can be suppressed more effectively and seedlings can be grown into healthy plants.

The irradiation time (T ₁ ) in the first irradiation step is not particularly limited, and can be appropriately set, for example, according to the period of one day. Said T ₁ is, for example, 12 to 20 hours, preferably 14 to 18 hours or 15 to 17 hours. When the _daily cycle is 24 hours, the T1 is, for example, 12-20 hours, preferably 14-18 hours or 15-17 hours.

The suppression method of the present invention may include, for example, a non-irradiation step in which the plant is not irradiated with light. In the one-day cycle, the non-irradiation step can be, for example, a step other than the first irradiation step. The non-irradiation step can be performed, for example, by preventing light from being emitted from the light source used in the first irradiation step. The time (T ₃ ) of the non-irradiation step can be appropriately set according to the irradiation time of the first irradiation step.

The control method of the present invention preferably includes a second irradiation step of irradiating the plant with blue light after the first irradiation step. By including the second irradiation step, the suppression method of the present invention can more effectively suppress the blistering disease and suppress the growth of the plant. The second irradiation step may be performed, for example, once or multiple times. In the second irradiation step, the plant is irradiated with light continuously or discontinuously, and the former is preferred.

The second irradiation step can be performed, for example, by using a blue light source and irradiating the plant with blue light emitted from the light source. As a specific example, the second irradiation step can be performed, for example, by irradiating the plant with blue light from a light source installed above the plant with the light projection direction directed downward. The light source used in the second irradiation step may be the same as or different from the light source used in the first irradiation step.

In the second irradiation step, the photon flux density (L _B ) of the blue light is not particularly limited. The lower limit of L _B is not particularly limited, and is, for example, 20 μmol m ⁻² s ⁻¹ , preferably 30 μmol m ⁻² s ⁻¹ . The upper limit of L _B is not particularly limited, and is, for example, 60 μmol m ⁻² s ⁻¹ , preferably 50 μmol m ⁻² s ⁻¹ . The range of L _B is, for example, 20 to 60 μmol m ⁻² s ⁻¹ , and preferably 30 to 50 μmol m ⁻² s ⁻ because the bullous disease can be effectively suppressed and seedlings can be grown into healthy plants. ¹ .

The irradiation time (T ₂ ) in the second irradiation step is not particularly limited, and can be appropriately set, for example, according to the period of one day. _The T2 is, for example, 1 to 5 hours, and is preferably 3 to 5 hours because the blistering disease can be effectively suppressed and healthy plants can be raised.

The ratio of T ₂ to T ₁ (T ₂ /T ₁ ) is not particularly limited, and is, for example, in the range of 0.1 ≤ T ₂ /T ₁ ≤ 0.3, preferably 0.2. ≦T ₂ /T ₁ ≦0.3.

When the suppression method of the present invention includes the second irradiation step, the suppression method of the present invention preferably includes the non-irradiation step. In this case, in the cycle of one day, the non-irradiation step can be, for example, a step other than the first irradiation step and the second irradiation step. When the suppression method of the present invention includes the second irradiation step and the non-irradiation step, the suppression method of the present invention can effectively suppress the blistering disease and raise seedlings into healthy plants. It is preferable to perform the irradiation step, the second irradiation step, and the non-irradiation step in this order.

When the suppression method of the present invention includes the first irradiation step, the second irradiation step, and the non-irradiation step, the suppression method of the present invention includes, for example, the first irradiation step, the first 2 irradiation step and the non-irradiation step are regarded as one set, and it is preferable to carry out a plurality of sets of these steps. The plurality is not particularly limited, and can be appropriately set, for example, according to the period until the plant grows to a desired growth stage. As a specific example, when the time for one set of the first irradiation step, the second irradiation step and the non-irradiation step is 24 hours, that is, one day, and the plant is raised from seed to seedling, The first irradiation step, the second irradiation step and the non-irradiation step are performed, for example, 10 to 20 sets (10 to 20 days), preferably 14 to 16 sets (14 to 16 days).

When the suppression method of the present invention performs a plurality of sets of the first irradiation step, the second irradiation step, and the non-irradiation step, between each set, the first irradiation step, the second and other steps other than the irradiation step and the non-irradiation step. The other step includes, for example, a step of irradiating the plant with light under conditions different from those of the first irradiation step and the second irradiation step.

In the suppression method of the present invention, the plant cultivation method and cultivation conditions in each step are not particularly limited, and can be appropriately determined according to the type of the plant. Specific examples of the cultivation temperature include 10 to 35°C and 15 to 30°C. Humidity during cultivation is, for example, 10 to 90%, 30 to 80%, and 50 to 80%. The humidity may be, for example, the humidity of the place where the plant is cultivated or the humidity of the base of the plant. The frequency of watering is, for example, once every 1 to 5 days and once every 1 to 3 days. The potting soil used for cultivating the plant is not particularly limited, and can be appropriately determined according to the type of the plant.

<Plant production method>
As described above, the plant production method of the present invention includes a growing step of irradiating the plant with light to grow, and the growing step is carried out by the suppressing method of the present invention. The production method of the present invention is characterized in that the growth step is performed by the suppression method of the present invention, and other steps and conditions are not particularly limited. According to the production method of the present invention, seedlings in which the occurrence of bullous disease is suppressed can be produced. In addition, according to the production method of the present invention, the occurrence of bullous disease during growth can be suppressed, so seedlings that can be used for fixed planting can be efficiently produced. For the production method of the present invention, the description of the suppression method of the present invention can be used.

The growth stage of the plant is not particularly limited. The plant seedling means, for example, a plant seedling, and may be an autologous seedling or a grafted seedling. For the plant seedlings, the description of the suppression method of the present invention can be used.

The growing step is carried out, for example, until the plant reaches the desired growth stage.

<Suppressor>
As described above, the apparatus for suppressing blistering in plants of the present invention includes a first irradiation unit capable of irradiating the plant with blue light, a second irradiation unit capable of irradiating the plant with green light, and a red light unit capable of irradiating the plant with red light. a third irradiation unit capable of irradiating light; and a control unit controlling irradiation by the first irradiation unit, the second irradiation unit, and the third irradiation unit, wherein the control unit comprises the Photon flux density (L _R ) of red light emitted from the third irradiation unit and the first irradiation during irradiation by the first irradiation unit, the second irradiation unit, and the third irradiation unit The first irradiation is performed so that the ratio (L _R /L _B ) of the photon flux density (L _B ) of the blue light emitted from the unit satisfies the range of 0.6≦L _R /L _B ≦2. control the illumination of the unit and the third illumination unit; In the suppressing device of the present invention, when the control unit performs irradiation by the first irradiation unit, the second irradiation unit, and the third irradiation unit, L _R /L _B is 0.6≦L _R It is characterized by controlling the irradiation of the first irradiation unit and the third irradiation unit so as to satisfy the range of /L _B ≦2, and other configurations and conditions are not particularly limited. The suppressing device of the present invention can use the description of the suppressing method and production method of the present invention.

Next, an example of the suppressing device of the present invention will be described with reference to the drawings.

FIG. 1 shows an example of the suppression device of the present invention. As shown in FIG. 1 , the suppression device 10 comprises a first irradiation unit 11 , a second irradiation unit 12 , a third irradiation unit 13 and a control unit 14 . As shown in FIG. 1, the suppression device 10 is arranged above the plant P, and the first irradiation unit 11, the second irradiation unit 12, and the third irradiation unit 13 of the suppression device 10 are respectively , emit blue, green and red light. The first irradiation unit 11, the second irradiation unit 12 and the third irradiation unit 13 respectively comprise light sources for blue, green and red light. The control unit 14 is connected to the first irradiation unit 11, the second irradiation unit 12 and the third irradiation unit 13, controls ON/OFF of the light source of each irradiation unit, controls the illumination time and the intensity of each light. do. The control unit 14 may be a microcomputer or the like, or may have the same configuration as a personal computer or the like including an arithmetic device such as a CPU. The control unit 14 controls each irradiation unit, as described above, according to a program that executes the suppression method of the invention. In FIG. 1, the first irradiation unit 11, the second irradiation unit 12, and the third irradiation unit 13 are configured by separate members, but any two or more of them may be configured integrally, and all may be integrally configured. Also, the control unit 14 is configured as a separate member from the first irradiation unit 11, the second irradiation unit 12, and the third irradiation unit 13, but may be configured integrally with any of the irradiation units. , that is, it may be incorporated inside the irradiation unit. The suppressing device 10 is used by controlling each irradiation unit with the control unit 14 so as to perform the same suppressing method as the suppressing method of the present invention.

Next, examples of the present invention will be described. In addition, the present invention is not limited or limited by the following examples.

[Example 1]
It was confirmed that the suppression method of the present invention can suppress the onset of bullous disease.

After introducing bed soil (hydrous cell culture soil initial fertilizing type, manufactured by Takii Seed Co., Ltd.) into a seeding tray with 200 holes, tomato plant seeds (Momotaro Piece, B Barrier or TTM-079, both Takii Seed Co., Ltd. made) was sown on bed soil. Next, cover soil (hydrous cell culture soil initial fertilization type) was introduced into the seeding tray. Then, after sufficiently watering the seeding tray, cultivation was continued until two true leaves developed (14 to 16 days after seeding). Cultivation conditions and light irradiation conditions were as follows. For the samples without the second irradiation step, the non-irradiation step was performed for 8 hours. On the other hand, the samples subjected to the second irradiation step for 4 hours were subjected to the non-irradiation step for 4 hours. The photon flux density in the plant was measured by placing the above-described measuring device in the center of the seeding tray with the light receiving surface facing the light source side.

(Cultivation conditions)
Daily cycle: 24 hours Humidity (cultivation room): 60%
Humidity (stock source): 80%
Irrigation: Bottom irrigation once every 3 days

(Light irradiation conditions)
T ₁ : 16 hours T ₂ : 0 or 4 hours T ₃ : 8 or 4 hours Photon flux density of each light in the first irradiation step: Photon flux density of blue light in the second irradiation step as shown in Table 1 below: 40 μmol m ⁻² s ⁻¹

After the cultivation, each plant was evaluated based on the evaluation criteria for blistering and the following evaluation criteria for length. The length of the hypocotyl was evaluated by measuring the length (L) of the hypocotyl above the culture soil. These results are shown in Table 1 below.

(Evaluation criteria for bullous disease)
◎: No onset ○: Premonition or extremely mild onset ×: Onset

(Evaluation criteria for length)
◎: L<4.0 (cm)
○: 4.0 ≤ L < 5.0 (cm)
×: 5.0 ≤ L (cm)

As shown in Table 1 above, blistering occurred in both Comparative Examples 1A and 1B where L _R /L _B =0.5 or 2.4. On the other hand, all of Examples 1A to 1, which satisfy 0.6≦L _R /L _B ≦2, inhibited the onset of bullous disease. In particular, Examples 1A to G satisfying 0.8≦L _R /L _B ≦2.0 were able to effectively suppress blistering in a wider range of breeds. Furthermore, in Examples 1D, E and G satisfying 1.0≦L _R /L _B ≦1.4 and 0.9≦L _R /L _G ≦1.1, blistering was observed for wider varieties. The disease could be effectively suppressed, and the growth of seedlings could be suppressed. In Examples 1D, E, and G satisfying 1.0≦L _R /L _B ≦1.4 and 0.9≦L _R /L _G ≦1.1, the above (1) to (4) ), and healthy plant seedlings could be raised.

From the above, it was found that the suppression method of the present invention can suppress the onset of bullous disease.

[Example 2]
It was confirmed that the suppression method of the present invention can suppress the onset of bullous disease.

In the same manner as in Example 1, except that the photon flux density of each light in the first irradiation step shown in Table 2 below was used instead of the photon flux density of each light in the first irradiation step shown in Table 1. were evaluated for bullous disease and attrition length. These results are shown in Table 2 below.

As shown in Table 2 above, all of Examples 2A to 2J satisfying 0.6≦L _R /L _B ≦2 suppressed the onset of bullous disease. Further, in Examples 2D to G satisfying 1.0≦L _R /L _B ≦1.4 and 0.9≦L _R /L _G ≦1.1, bullous disease was observed in a wider range of breeds. It could be effectively suppressed and the elongation of seedlings could be suppressed. In Examples 2D to G satisfying 1.0≦L _R /L _B ≦1.4 and 0.9≦L _R /L _G ≦1.1, the above (1) to (4) The conditions were met, and healthy plant seedlings could be raised. Furthermore, as is clear from the results of the Momotaro pieces of Examples 2A and 2B, the inclusion of the second irradiation step effectively suppressed the lengthening. And, as is clear from the results of the Momotaro pieces of Examples 2H and 2I, the inclusion of the second irradiation step suppressed the onset of bullous disease.

From the above, it was found that the suppression method of the present invention can suppress the onset of bullous disease.

[Example 3]
It was confirmed that the suppression method of the present invention can suppress the onset of bullous disease and the elongation of plants in raising seedlings for different tomato varieties.

As plant seeds, instead of Momotaro Piece, B Barrier, and TTM-079, the tomato seeds in Table 3 below were used, and the following irradiation conditions were used. evaluated. These results are shown in Table 3 below.

・Irradiation conditions for varieties 1 to 10 T ₁ : 16 hours T ₂ : 4 hours T ₃ : 4 hours Photon flux density of each light in the first irradiation step:
L _G : L _R : L _B =75:90:55 (μmol m ⁻² s ⁻¹ )
L _R /L _B =1.8
L _R /L _G =1.2
Photon flux density of blue light in the second irradiation step: 30 μmol m ⁻² s ⁻¹
Irradiation conditions for varieties 11 to 25 T ₁ : 16 hours T ₂ : 4 hours T ₃ : 4 hours Photon flux density of each light in the first irradiation step:
L _G : L _R : L _B =75:60:45 (μmol m ⁻² s ⁻¹ )
L _R /L _B =1.3
L _R /L _G =0.8
Photon flux density of blue light in the second irradiation step: 30 μmol m ⁻² s ⁻¹

As shown in Table 3 above, in all varieties, bullous disease was inhibited, and elongation was inhibited.

From the above, it was confirmed that the suppression method of the present invention can suppress the occurrence of blistering in different tomato varieties, and can also suppress the elongation of plants in raising seedlings.

Although the present invention has been described with reference to the embodiments and examples, the present invention is not limited to the above embodiments and examples. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

<Appendix>
Some or all of the above-described embodiments and examples can be described as the following supplementary notes, but are not limited to the following.
(Appendix 1)
Including a first irradiation step of irradiating the plant with light,
the light includes blue light, green light and red light;
The ratio (L _R /L _B ) of the photon flux density of red light (L _R ) to the photon flux density of blue light (L _B ) satisfies the range of 0.6≦L _R /L _B ≦2, in plants Method for controlling bullous blisters.
(Appendix 2)
The suppressing method according to appendix 1, wherein the L _R /L _B satisfies the range of 1≦L _R /L _B ≦1.4.
(Appendix 3)
3. The suppression method according to appendix 1 or 2, wherein in the first irradiation step, the photon flux density (L _G ) of the green light is 60 μmol m ⁻² s ⁻¹ or more.
(Appendix 4)
4. The suppression method according to any one of Appendices 1 to 3, wherein in the first irradiation step, the photon flux density (L _A ) of the light is in the range of 160 to 280 μmol m ⁻² s ⁻¹ .
(Appendix 5)
The ratio (L _R /L _G ) between the photon flux density of red light (L _R ) and the photon flux density of green light (L _G ) satisfies the range of 0.6≦L _R /L _G ≦1.6. , Supplementary notes 1 to 4, the suppression method according to any one of
(Appendix 6)
6. The suppression method according to any one of Appendices 1 to 5, wherein the irradiation time (T ₁ ) of the first irradiation step is 12 to 20 hours.
(Appendix 7)
7. The suppression method according to any one of Appendixes 1 to 6, including a second irradiation step of irradiating the plant with blue light after the first irradiation step.
(Appendix 8)
The ratio (T ₂ /T ₁ ) of the irradiation time (T ₂ ) of the second irradiation step and the irradiation time (T ₁ ) of the first irradiation step is 0.1≦T ₂ /T ₁ ≦0 Suppression method according to appendix 7, wherein the range of .
(Appendix 9)
The suppression method according to appendix 7 or 8, wherein the irradiation time (T ₂ ) of the second irradiation step is 1 to 5 hours.
(Appendix 10)
10. The control method according to any one of Appendices 1 to 9, including a non-irradiation step in which the plant is not irradiated with light.
(Appendix 11)
11. The suppression method according to any one of appendices 1 to 10, wherein the light originates from an LED.
(Appendix 12)
12. The control method according to any one of Appendices 1 to 11, wherein the plant is a tomato plant.
(Appendix 13)
Including the seedling raising process of irradiating the plant seedlings with light and raising the seedlings,
13. A method for producing plant seedlings, wherein the seedling-raising step is performed by the control method according to any one of Appendices 1 to 12.
(Appendix 14)
a first irradiation unit capable of irradiating a plant with blue light;
a second irradiation unit capable of irradiating plants with green light;
a third irradiation unit capable of irradiating a plant with red light;
a control unit that controls irradiation by the first irradiation unit, the second irradiation unit, and the third irradiation unit;
The control unit controls the photon flux density (L _R ) of red light emitted from the third irradiation unit during irradiation by the first irradiation unit, the second irradiation unit, and the third irradiation unit. and the photon flux density (L _B ) of the blue light emitted from the first irradiation unit (L _R /L _B ) satisfies the range of 0.6≦L _R /L _B ≦2 , A device for suppressing blistering in plants, which controls the irradiation of the first irradiation unit and the third irradiation unit.
(Appendix 15)
Appendix 14, wherein the control unit controls the first irradiation unit and the third irradiation unit such that L _R /L _B satisfies a range of 1≦L _R /L _B ≦1.4. suppression device.
(Appendix 16)
16. The suppression device according to appendix 14 or 15, wherein the control unit controls the second irradiation unit such that the photon flux density (L _G ) of the green light is 60 μmol m ⁻² s ⁻¹ or more.
(Appendix 17)
The control unit controls the first illumination unit, the second illumination unit, and the third illumination unit to be photon flux densities (L _A ) of light including the blue light, the green light, and the red light. 17. The suppression device according to any one of Appendices 14 to 16, wherein is controlled to be in the range of 160 to 280 μmol m ⁻² s ⁻¹ .
(Appendix 18)
The control unit controls the second irradiation unit and the third irradiation unit as a ratio (L _R /L _G ) of the photon flux density of red light (L _R ) to the photon flux density of green light (L _G ). ) satisfies the range of 0.6≦L _R /L _G ≦1.6.
(Appendix 19)
Appendices 14 to 18, wherein the control unit controls the irradiation time (T ₁ ) by the first irradiation unit, the second irradiation unit, and the third irradiation unit to be 12 to 20 hours. A restraining device according to any one of the preceding claims.
(Appendix 20)
The control unit controls to irradiate the plant with blue light by the first irradiation unit after irradiation by the first irradiation unit, the second irradiation unit, and the third irradiation unit. 20. A restraining device according to any one of clauses 14-19.
(Appendix 21)
The control unit controls the first irradiation unit, the second irradiation unit, and the third irradiation unit for the irradiation time (T ₂ ) by the first irradiation unit and the irradiation time (T ₁ ). _21. The suppressing device according to additional note 20, wherein the _ratio (T ₂ /T ₁ ) of .
(Appendix 22)
22. The suppression device according to appendix 20 or 21, wherein the control unit controls the first irradiation unit such that the irradiation time (T ₂ ) by the first irradiation unit is 1 to 5 hours.
(Appendix 23)
23. The suppression device according to any one of appendices 14 to 22, wherein the control unit controls not to perform irradiation by the first irradiation unit, the second irradiation unit, and the third irradiation unit.
(Appendix 24)
24. The suppressing device according to any one of clauses 14 to 23, wherein the first illumination unit, the second illumination unit and the third illumination unit comprise LEDs as light sources.
(Appendix 25)
25. The restraint device of any of Clauses 14-24, wherein the plant is a tomato plant.
(Appendix 26)
26. The restraining device according to any one of appendices 14 to 25, which is used in the restraining method according to any one of appendices 1 to 12.

As described above, according to the present invention, even when an LED lamp is used, visual quality inspection is possible by including green light, and the onset of blistering can be suppressed. Moreover, according to the present invention, by setting L _R /L _B to 0.6≦L _R /L _B ≦2, for example, a plant having a healthy seedling shape can be grown. Furthermore, according to the present invention, the occurrence of blisters can be suppressed by controlling L _R /L _B , so that, for example, ultraviolet irradiation is unnecessary. Therefore, according to the present invention, for example, plants can be grown in a safe environment that does not use ultraviolet rays. Therefore, the present invention is extremely useful in the field of agriculture, such as quality control of seeds and raising seedlings in plant factories.

10 suppression device 11 first irradiation unit 12 second irradiation unit 13 third irradiation unit 14 control unit

Claims (13)

including a first irradiation step of irradiating the plant seedling with light,
the light includes blue light, green light and red light;
The blue light, green light and red light are light derived from LEDs,
The wavelength of the blue light is 400 nm or more and less than 500 nm,
The wavelength of the green light is 500 nm or more and less than 600 nm,
The wavelength of the red light is 600 nm or more and less than 700 nm,
the photon flux density (L _A ) of the light is in the range of 160 to 280 μmol m ⁻² s ⁻¹ ;
the photon flux density (L _B ) of the blue light is 45 to 110 μmol m ⁻² s ⁻¹ ;
the photon flux density (L _R ) of the red light is 60 to 100 μmol m ⁻² s ⁻¹ ;
The ratio (L _R /L _B ) between the photon flux density of red light (L _R ) and the photon flux density of blue light (L _B ) satisfies the range of 0.6≦L _R /L _B ≦2,
In the first irradiation step, without irradiating ultraviolet rays,
A method for suppressing blistering in plants, wherein the wavelength of the ultraviolet rays is less than 400 nm. 2. The suppression method according to claim 1, wherein said L _R /L _B satisfies a range of 1≦L _R /L _B ≦1.4. 3. The suppression method according to claim 1, wherein in the first irradiation step, the photon flux density (L _G ) of the green light is 60 μmol m ⁻² s ⁻¹ or more. The suppression method according to any one of claims 1 to 3, wherein in the first irradiation step, the photon flux density (L _A ) of the light is in the range of 180 to 230 µmol m ^-2 s ^-1 . . The ratio (L _R /L _G ) of the photon flux density of red light (L _R ) to the photon flux density of green light (L _G ) is in the range of 0.6≦L _R /L _G ≦1.6. 5. A control method as claimed in any one of claims 1 to 4, which satisfies. A suppression method according to any one of claims 1 to 5, wherein the irradiation time (T ₁ ) of said first irradiation step is 12 to 20 hours. The suppression method according to any one of claims 1 to 6, comprising a second irradiation step of irradiating the plant with blue light after the first irradiation step. The ratio (T ₂ /T ₁ ) of the irradiation time (T ₂ ) of the second irradiation step and the irradiation time (T ₁ ) of the first irradiation step is 0.1≦T ₂ /T ₁ ≦0 8. A suppression method according to claim 7, wherein the range is .3. The suppression method according to claim 7 or 8, wherein the irradiation time (T ₂ ) of the second irradiation step is 1 to 5 hours. The suppression method according to any one of claims 1 to 9, comprising a non-irradiation step in which the plant is not irradiated with light. The control method according to any one of claims 1 to 10 , wherein the plant is a tomato plant. Including a growth process of irradiating light on plant seedlings to grow,
A method for producing a plant, wherein the growing step is performed by the control method according to any one of claims 1 to 11 . A device for use in the method for suppressing bulla blisters in plants according to any one of claims 1 to 11,
a first irradiation unit capable of irradiating a plant with blue light;
a second irradiation unit capable of irradiating plants with green light;
a third irradiation unit capable of irradiating a plant with red light;
a control unit that controls irradiation by the first irradiation unit, the second irradiation unit, and the third irradiation unit;
The first irradiation unit, the second irradiation unit, and the third irradiation unit each include an LED as a light source,
The wavelength of the blue light is 400 nm or more and less than 500 nm,
The wavelength of the green light is 500 nm or more and less than 600 nm,
The wavelength of the red light is 600 nm or more and less than 700 nm,
The control unit controls the photon flux density (L _R ) of red light emitted from the third irradiation unit during irradiation by the first irradiation unit, the second irradiation unit, and the third irradiation unit. and the photon flux density (L _B ) of the blue light emitted from the first irradiation unit (L _R /L _B ) satisfies the range of 0.6≦L _R /L _B ≦2 , controlling the irradiation of the first irradiation unit and the third irradiation unit;
The first irradiation unit, the second irradiation unit, and the third irradiation unit do not irradiate ultraviolet rays,
A device for suppressing blistering in plants, wherein the wavelength of the ultraviolet rays is less than 400 nm.

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