JP4159485B2 - Method for inducing flower buds of cruciferous plants - Google Patents

Description

  The present invention relates to a flower bud induction method and a flower bud induction device for promoting flower bud formation of cruciferous plants.

  The cruciferous plants include many vegetables such as radish, Chinese cabbage, cabbage, turnip and chingensai. In these cruciferous plants, flower buds are generally formed at a low temperature, and extraction of moss (sprouting) is promoted under the conditions of long days and high temperatures thereafter. And since flower bud formation and extraction determine the value of the product, thorough temperature and humidity management and fertilization management are performed, especially in winter and spring cultivation, where cruciferous plant flower bud formation is likely to occur. Year-round cultivation is carried out while avoiding moss.

  However, in recent years, flower buds of cruciferous plants such as Chingensai have been proved to be nutritious and very delicious, and are attracting attention as one of the ingredients. In addition, when seeds are collected, it is necessary to form flower buds to cause extraction. For these reasons, apart from the method of cultivating while avoiding the above-mentioned flower bud formation and extraction, there is a demand for the development of a method for causing cruciferous plants to form flower buds throughout the year.

Conventionally, a cultivation method for irradiating plant seedlings with artificial light has been studied. As such a technique, the following Patent Document 1 describes a method for cultivating a plant in which artificial light composed of blue light having a specific output wavelength and a specific photon flux density is irradiated to a growing plant. It is described to promote flower bud formation by such a method.
JP 2001-258389 A

  However, since the cultivation method described in Patent Document 1 is a cultivation method mainly aimed at promoting flower bud formation, fruit vegetables, fruit trees, and cereal flower bud formation, it is suitable for leaf vegetables, root vegetables, or flower vegetables. Even if the above cultivation method is applied to the cruciferous plants in which flower buds are formed under low temperature conditions and long day conditions in winter, it is difficult to sufficiently promote flower bud formation throughout the year.

  The present invention has been made in view of the above-described problems of the prior art, and provides a flower bud induction method and a flower bud induction apparatus capable of sufficiently promoting flower bud formation throughout the year. The purpose is to do.

  As a result of intensive studies to achieve the above-mentioned object, the present inventors have radiated a specific artificial light under a specific temperature condition to a seed of a cruciferous plant, thereby forming flower buds of a cruciferous plant throughout the year. Has been found to be sufficiently promoted, and the present invention has been completed.

That is, in the seedling room in which light from the outside is blocked, the present invention is a blue light having a wavelength of 400 to 500 nm emitted from a semiconductor light source to a seed of a cruciferous plant and a red light having a wavelength of 600 to 700 nm emitted from a semiconductor light source. The temperature in the nursery room when the artificial light including light is intermittently irradiated and the artificial light is irradiated is set to 13 to 20 ° C., and the temperature in the nursery room when the artificial light is not irradiated is set to 3 to 7 A flower bud of a cruciferous plant characterized in that the seedling is placed in a nursery room in a state where one or two main leaves have emerged, and the artificial light is intermittently irradiated to the seedling for at least 10 days. Provide a guidance method.

  Here, the red light is light that contributes significantly to the photosynthesis of cruciferous plants compared to light of other wavelengths, and it is considered that seedlings can efficiently perform photosynthesis. The blue light is considered to be an important light in shaping the shape of a plant as well as contributing to the photosynthesis of Brassicaceae plants next to red light. The contribution of blue light and red light to Brassicaceae plants is thought to be due to the photoreceptors of Brassicaceae plants.

  And the artificial light containing such blue light and red light is intermittently irradiated to the seedlings of the cruciferous plant, and the temperature when irradiating the artificial light is set to the above-mentioned relatively high temperature range, and the irradiation is performed. The temperature at the time of not performing is set to the above-mentioned range having a relatively low temperature. This makes it an optimal environment for promoting the growth of Brassica seedlings when irradiated with artificial light, and an optimal environment for promoting the flower bud differentiation of Brassicaceae plants when not irradiated with artificial light. By repeating this, it is possible to sufficiently and reliably promote the healthy growth and flower bud formation of cruciferous plant seedlings. In addition, by growing seedlings soundly, more flower buds can be formed in a shorter period of time. Moreover, since the seedlings of Brassicaceae plants can be grown under a constant environment throughout the year, flower bud formation can be sufficiently promoted throughout the year regardless of the growing season.

  Moreover, in the flower bud induction method of the cruciferous plant mentioned above, it is preferable that the said artificial light consists only of the said blue light and the said red light.

  By using such artificial light, it is possible to sufficiently and reliably promote the healthy growth and flower bud formation of cruciferous plant seedlings. And since only blue light and red light are used, it is possible to irradiate light uniformly to each seedling as compared with the case of using other light, and it is advantageous in terms of cost and efficiently. Seedlings can be grown.

  Furthermore, in the above-mentioned method for inducing flower buds of cruciferous plants, it is preferable to irradiate the seedlings with the artificial light continuously for 8 to 10 hours per day.

  When the artificial light irradiation time is less than 8 hours, the growth rate of the seedling tends to be lower than when the irradiation time is within the above range, and when the artificial light irradiation time exceeds 10 hours, the irradiation time Compared with the case where is within the above range, the time when flower buds are formed tends to be delayed.

Furthermore, in the flower bud induction method Brassicaceae described above, seedlings were placed in nursery room in a state in which one or two sheets true leaves exits, intermittent irradiation of artificial light to the plants, or at least 10 days It intends line.

  If the seedlings are placed in the nursery room before the seedlings appear in the nursery room and artificial light irradiation is started, the seedlings will not be able to perform sufficient photosynthesis, and the growth rate will be reduced. Compared to the case, the time when the flower bud is finally formed tends to be delayed. On the other hand, when artificial light irradiation is started after the number of true leaves exceeds two, the number of true leaves formed before the flower buds are formed increases, and seedlings are grown as described above. In comparison, the time when the flower bud is finally formed tends to be delayed. And while starting the irradiation of artificial light in a state where 1 to 2 true leaves have appeared in the seedling, it is possible to form more flower buds in a shorter period of time by performing the irradiation of artificial light for at least 10 days. There is a tendency to be able to.

  The present invention is also a flower bud induction device for promoting flower bud formation of a cruciferous plant, which is a nursery room in which light from the outside is blocked, and a wavelength of 400 to 500 nm that is installed in the nursery room and emitted from a semiconductor light source. Light irradiation means for intermittently irradiating the seedlings with artificial light containing blue light and red light having a wavelength of 600 to 700 nm emitted from the semiconductor light source, and in the nursery room when the artificial light is irradiated And a temperature control means for setting the temperature in the nursery room to 3 to 7 ° C. when the temperature is 13 to 20 ° C. and not being irradiated with artificial light. provide.

  According to such an apparatus, it is possible to sufficiently and reliably promote the healthy growth and flower bud formation of cruciferous plants throughout the year.

  In the apparatus for inducing flower buds of the Brassicaceae plant, the artificial light preferably comprises only the blue light and the red light.

  By providing such light irradiation means for irradiating artificial light, it is possible to sufficiently and reliably promote healthy growth and flower bud formation of cruciferous plant seedlings. And since a light irradiation means is for irradiating only blue light and red light, while being able to irradiate light uniformly to each seedling compared with the case where other light is further used, cost This is also advantageous, and seedlings can be efficiently grown.

  ADVANTAGE OF THE INVENTION According to this invention, the flower bud induction method and the flower bud induction apparatus of the cruciferous plant which can fully and reliably promote the healthy growth and flower bud formation of the cruciferous plant seedling throughout the year are provided. can do.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the same or corresponding parts are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a block diagram showing a preferred embodiment of the apparatus for inducing flower buds of the cruciferous plant of the present invention. As shown in FIG. 1, the flower bud induction device 10 includes a seedling room 12 that blocks light from the outside, a light irradiation means 14 installed in the seedling room 12, a power source control means 16, and a seedling room 12. A temperature control means 18 for controlling the temperature and a temperature detection means 20 for detecting the temperature in the nursery room 12 are provided. In the seedling room 12, a seedling tank 24 for growing the cruciferous plant seedling 22 is arranged. Hereinafter, each component which comprises the flower bud guidance apparatus 10 is demonstrated.

  The seedling room 12 is a room for growing seedlings of the cruciferous plant 22 in a state in which light from the outside such as sunlight is blocked, and is a chamber capable of keeping the internal temperature constant at a set temperature. A thermostat or the like can be used.

  The light irradiation means 14 intermittently irradiates the seedling 22 with artificial light including blue light having a wavelength of 400 to 500 nm emitted from the semiconductor light source and red light having a wavelength of 600 to 700 nm emitted from the semiconductor light source. belongs to. Here, from the viewpoint of sufficiently promoting the healthy growth of the cruciferous plants, the wavelength of blue light is preferably 450 to 490 nm, and the wavelength of red light is preferably 640 to 680 nm.

  It is preferable that the light irradiation means 14 provided with such a semiconductor light source has a configuration capable of emitting blue light and red light sufficiently uniformly to each of the seedlings 22, for example, the light irradiation means 14. 2 has a configuration in which the semiconductor light sources 32 are arranged in a lattice pattern on the substrate 30 as shown in FIG. Here, in the semiconductor light source 32, the arrangement configuration of a light source that emits blue light (hereinafter referred to as “blue light source”) and a light source that emits red light (hereinafter referred to as “red light source”) includes, for example, a blue light source and a red light source. Each of the seedlings 22 is irradiated with the blue light and the red light sufficiently uniformly. It is the composition which becomes.

  Further, the ratio of the number of blue light sources to red light sources is not particularly limited, but in order to sufficiently promote the healthy growth and flower bud formation of the seedling 22, the number of blue light sources: the number of red light sources is set to 10: 90-50. : 50 is preferable. The arrangement when the number of blue light sources and red light sources is not the same may be such that blue light and red light are irradiated as uniformly as possible to each of the seedlings 22. For example, when the number of blue light sources is 20 and the number of red light sources is 80, the arrangement of blue light sources 34 and red light sources 36 as shown in FIG.

  As the semiconductor light source 32, a semiconductor laser or a light emitting diode (LED) having excellent monochromaticity and light emission efficiency is used. Here, the shape of the semiconductor light source 32 is not particularly limited, and may be a cannonball type or a chip type, or may be an element such as an LED itself. In the case of the chip type, there is an advantage that the semiconductor light sources 32 can be more densely arranged on the substrate 30. When an element such as an LED itself is used (for example, an LED array of an LED element arrangement type) In the case of the light irradiation means 14), the semiconductor light sources 32 can be arranged more densely on the substrate 30, and the influence of directivity can be reduced more than the chip type, which is ideal. There is an advantage that it is possible to perform simple light irradiation. By using these semiconductor light sources, the generation of heat at the time of light irradiation can be sufficiently reduced, so that it is possible to prevent the occurrence of high temperature failure of the seedling 22 due to the light source, and the seedling 22 and the semiconductor light source Can be sufficiently shortened, and temperature management in the nursery room 12 is facilitated.

  Further, the light irradiation means 14 may include a light source other than the red light source and the blue light source as long as the growth of the seedling 22 and the flower bud formation are not inhibited.

  The power supply control means 16 is for performing on / off control of the light irradiation means 14, control of supplied power, and the like, whereby intermittent irradiation of artificial light is performed.

  The temperature control means 18 sets the temperature in the nursery room 12 when the artificial light is irradiated to the seedling 22 by the light irradiation means 14 to 13 to 20 ° C., and the temperature control means 18 in the nursery room 12 when the artificial light is not irradiated. It is for setting temperature to 3-7 degreeC. In addition, from a viewpoint of forming a flower bud more reliably in a short period, the temperature control means 18 is for making the temperature in the nursery room 12 at the time of irradiating artificial light into 13-18 degreeC. preferable. The temperature control means 16 is a seedling room according to the temperature in the seedling room 12 detected by the temperature detection means 20 such as a temperature sensor so that the temperature in the seedling room 12 becomes a temperature set within the above range. The temperature is adjusted by controlling a heating / cooling device (not shown) disposed in the inside.

  The seedling raising tank 24 is for raising the seedlings 22 of the cruciferous plant, and is in a state in which, for example, the cultivated soil is put in a container such as a seedling pallet and irrigated.

  Next, the case where the flower bud induction | guidance | derivation method of the cruciferous plant of this invention is performed using the flower bud induction | guidance apparatus 10 of the cruciferous plant which has the structure mentioned above is demonstrated. In addition, in the following description, the case where the cruciferous plant is Chingensai will be described.

  First, seedling seeds are sown in the seedling tank 24 and naturally cultivated in a normal environment. At this time, the light source is not particularly limited, and in addition to sunlight, a lamp, a semiconductor light source, or the like can be used as appropriate. In addition, irrigation and fertilization are performed under the same conditions as usual. Then, natural cultivation is performed until the seeds of Chingensai germinate and several true leaves (about 1 to 3) emerge.

  Next, the seedlings 22 grown as described above are placed in the seedling raising room 12 of the flower bud induction device 10 together with the seedling raising tank 24, and artificial light is irradiated by the light irradiation means 14. Here, the inside of the seedling room 12 is blocked from outside light such as sunlight, and is emitted from the semiconductor light source with blue light having a wavelength of 400 to 500 nm (preferably 450 to 490 nm) emitted from the semiconductor light source. Artificial light including red light having a wavelength of 600 to 700 nm (preferably 640 to 680 nm) is intermittently applied to the seedling 22. In addition, the time which puts the seedling 22 in the nursery room 12 and starts irradiation of artificial light may be after 1 to 2 main leaves appear on the seedling 22 from the viewpoint of forming flower buds in a shorter period of time. preferable.

  Here, the artificial light preferably includes only the blue light and the red light. Moreover, it is preferable that the artificial light irradiation is performed continuously for 8 to 10 hours per day, and the healthy growth and flower bud formation of the Chingensai seedling 22 are performed by intermittently irradiating the artificial light with such a period. It can be promoted more fully.

Further, the light intensity of the artificial light is adjusted so that the photosynthesis effective photon flux density (PPFD) on the upper surface of the seedling 22 when growing is started in the nursery room 12 is 50 to 60 μmol · m ⁻² · s ^−1. It is preferable to do. Thereby, the healthy growth and flower bud formation of Chingensai can be more fully promoted. The light intensity may be constant from the start to the end of the seedling 22 in the nursery room 12, and is adjusted according to the growth of the seedling 22 so that the PPFD on the upper surface of the seedling 22 is always constant. May be.

  The temperature in the seedling room 12 is set to 13 to 20 ° C. when the artificial light is irradiated by the temperature control means 18, and the seedling room 12 when the artificial light is not irradiated. The inside temperature is 3-7 ° C. In addition, it is preferable to make the temperature in the seedling raising room 12 at the time of irradiating artificial light into 13-18 degreeC from a viewpoint of forming a flower bud more reliably in a short period.

  In the flower bud induction method of the present invention, the period for performing the artificial light irradiation described above is not particularly limited, but until several more true leaves appear on the seedling 22 (the total number of true leaves is about 2 to 5). It is preferable to carry out. Further, the specific number of days varies depending on the seedling age when the seedling 22 is put in the nursery room 12, the set temperature in the seedling room 12, and the like, but it is 10 after the seedling 22 is put in the seedling room 12. It is preferable to carry out for more than a day, and it is preferable to carry out for 20-30 days.

  In addition, during the growth of the seedlings 22 using the flower bud induction device 10, irrigation, fertilization, etc. are performed under the same conditions as those for the normal growth of seedlings.

  Thus, after growing the seedling 22 using the flower bud induction device 10, the seedling 22 is planted and cultivated naturally under a normal environment. The light source at this time is not particularly limited, and in addition to sunlight, a lamp, a semiconductor light source, or the like can be used as appropriate. In addition, irrigation and fertilization are performed under the same conditions as usual.

  By growing the Brassicaceae plant seedlings 22 by the flower bud induction method described above, the seedlings 22 can be grown healthy and the flower buds can be reliably formed throughout the year.

  And when flower buds are needed for food, Chingensai grows sufficiently and is harvested after confirming flower bud formation and extraction. On the other hand, when seeds are required, the formation of flower buds and extraction are confirmed, the seeds are collected after the flower buds have bloomed and seeds have been formed.

  EXAMPLES Hereinafter, although this invention is demonstrated more concretely based on an Example and a comparative example, this invention is not limited to a following example.

[Example 1 and Comparative Examples 1 to 4]
Soil was placed in a seedling pallet (10 holes × 20 rows) and seeds of Chingensai (variety: Sayaka Hayase) were sown in each hole, followed by sufficient irrigation. In addition, sowing was performed at the end of November (daytime temperature: 8 to 10 ° C.), which is the time when flower buds are formed even when naturally cultivated.

  And after seed germination, it was naturally cultivated by using sunlight as a light source for about one week until 1 to 3 main leaves appeared. The conditions such as irrigation and fertilization at this time were the same as the conditions for growing a normal Chingensai seedling. Five seedling pallets for growing seedlings up to this stage were prepared for Example 1 and Comparative Examples 1 to 4.

  Next, for the seedlings grown as described above, seedlings were grown under the following conditions for each of Example 1 and Comparative Examples 1 to 4 for 30 days until 2 to 5 true leaves appeared. The conditions for irrigation, fertilization, etc. were the same as the conditions for growing a normal Chingensai seedling.

(1) Example 1
First, the above seedling pallet was moved into a chamber where external light was blocked. Next, 20 bullet-shaped blue LEDs (trade name: NSPB500, manufactured by Nichia Corporation, irradiation angle: 30 °, luminous intensity: 2.4 cd) emitting blue light with a central wavelength of 470 nm, and red with a central wavelength of 660 nm 80 bullet-shaped red LEDs emitting light (trade name: HLMP-C025, manufactured by Hewlett-Packard, irradiation angle: 25 °, luminous intensity: 1 cd) are arranged on a substrate as shown in FIG. An LED array having a configuration covered with a transparent plastic cover was prepared. This LED array was arranged at a position about 10 cm away from the top surface of the seedling so as to be parallel to the seedling pallet.

In this state, the seedlings were irradiated with artificial light composed of blue light and red light by the LED array. The artificial light was irradiated for 9 hours from 8:00 to 17:00 per day, and the other 15 hours were not irradiated. The temperature in the chamber was 15 ° C. when irradiated with artificial light and 5 ° C. when not irradiated. Moreover, the light intensity at the time of artificial light irradiation is adjusted so that the PPFD on the upper surface of the seedling is about 54 μmol · m ⁻² · s ⁻¹ (illuminance: 1000 lx), and the voltage applied to the LED array is 24 V, The current was 0.3A.

(2) Comparative Example 1
Natural cultivation was performed using sunlight as a light source under the same conditions as natural cultivation until one to two true leaves were produced. In addition, the average temperature at the time of raising seedlings was about 10 ° C. during the day (8:00 to 17:00) and about 4 ° C. at night (17:00 to 8:00).

(3) Comparative Example 2
Except for using an LED array comprising 100 bullet-type red LEDs (trade name: HLMP-C025, manufactured by Hewlett-Packard, irradiation angle: 25 °, luminous intensity: 1 cd) emitting red light having a center wavelength of 660 nm. Seedlings were grown under the same conditions as in Example 1.

(4) Comparative Example 3
Implemented except that an LED array having 84 chip-type red LEDs (trade name: TLOH1100, manufactured by Toshiba Corporation, irradiation angle: 180 °, luminous intensity: 0.27 cd) emitting red light with a central wavelength of 660 nm was used as the LED array. Seedlings were grown under the same conditions as in Example 1.

(5) Comparative Example 4
As the LED array, one having 84 chip-type blue LEDs (trade name: NSCB310, manufactured by Nichia Corporation, irradiation angle: 180 °, luminous intensity: 0.63 cd) emitting blue light having a central wavelength of 470 nm was used. The seedlings were grown under the same conditions as in Example 1 except for the above.

  As mentioned above, the day when the seedling conditions were changed for each of Example 1 and Comparative Examples 1 to 4 was regarded as the first day, and the seedling growth state (the height of seedlings and the number of true leaves) up to the 30th day after the lapse of days. Was observed. Table 1 shows the results of measuring the height [mm] of the seedlings, and Table 2 shows the results of counting the number of real leaves [sheets]. Here, the height of the seedling and the number of true leaves are average values of arbitrarily selected 5 seedlings. Moreover, FIG. 4 is a graph which shows the relationship between the elapsed days and the height of a seedling in the seedling of Example 1 and Comparative Examples 1-4.

  FIG. 5 (a) is a diagram showing the tissue of the seedlings on the 30th day of Example 1, and FIG. 5 (b) is a diagram of the seedlings shown in FIG. 5 (a). FIG. 6A is a diagram showing the structure of the seedling of the 30th day of Comparative Example 1, and FIG. 6B is a diagram of the seedling shown in FIG. 6A. FIG. 7A is a diagram showing the structure of the seedling of the 30th day of Comparative Example 2, and FIG. 7B is a diagram of the seedling shown in FIG. FIG. 8A is a diagram showing the structure of the seedling of the 30th day of Comparative Example 3, and FIG. 8B is a diagram of the seedling shown in FIG. 8A. FIG. 9A is a diagram showing the structure of the seedling of the 30th day of Comparative Example 4, and FIG. 9B is a diagram of the seedling shown in FIG. 9A.

  As is clear from the results shown in Tables 1 and 2 and FIGS. 5 to 9, the seedlings of Example 1 showed similar growth to the seedlings of Comparative Example 1 while comparing stem thickness and leaf size. There were about twice as many seedlings as in Example 1, and the leaves were strong in dark green and confirmed to be growing healthy. It was confirmed that the seedlings of Comparative Example 2 were weak green and green so that the whole was yellow-green and the true leaves did not come out. The seedling of Comparative Example 3 was confirmed to be extremely poor in growth, thin in stem, thin in leaf and small, and in a state where subsequent planting was impossible. It was confirmed that the seedling of Comparative Example 4 had a very large length, a thin stem and a palm shape, and the leaf size was very small as compared with Example 1.

  Next, the seedlings of Example 1 and Comparative Examples 1 to 2 and 4 that were raised as described above were planted (fixed planting interval: 30 cm × 15 cm), and the sun was grown for about 2 months until they were grown to the extent that they could be harvested. Naturally cultivated using light as a light source. In addition, conditions, such as irrigation and fertilization, were made the same as the normal cultivation conditions of Chingensai.

  During this cultivation period, by observing the appearance, flower buds were confirmed earliest in Chingensai of Example 1 (52 days after planting), then Comparative Example 1 (59 days after planting), and Comparative Example 2 (planting) On the 62nd day after), flower buds were confirmed in the order of Comparative Example 4 (65th day after planting). In addition, Table 3 shows the height [cm] of the Chingsai rhinoceros just before harvesting. Here, the height of Ching Xing Sai is an average value of 5 Ching Xing Sai selected arbitrarily.

  As described above, the Ching Xingi of Example 1 grew better than those of Comparative Examples 1 to 4, and flower buds were confirmed earliest.

[Examples 2-3 and Comparative Example 5]
After cultivating soil into a seedling pallet (10 holes × 20 rows) and sufficient irrigation, seeds of chingensai (variety: Hayakyo Hankyo) were sown in each hole. In addition, sowing was normally performed at the end of March (daytime temperature: 18 to 23 ° C.) when flower buds were not formed.

  And after seed germination, it was naturally cultivated using sunlight as a light source for about one week until 1 to 2 true leaves were produced. The conditions such as irrigation and fertilization at this time were the same as the conditions for growing a normal Chingensai seedling. Three seedling pallets for growing seedlings up to this stage were prepared for Examples 2-3 and Comparative Example 5.

  Next, for the seedlings grown as described above, seedlings were grown under the following conditions for Examples 2 to 3 and Comparative Example 5 for 34 days until 2 to 5 true leaves were produced. The conditions for irrigation, fertilization, etc. were the same as the conditions for growing a normal Chingensai seedling.

(1) Example 2
Seedlings were grown under the same conditions as in Example 1.

(2) Example 3
Seedlings were grown under the same conditions as in Example 1.

(3) Comparative Example 5
Seedlings were grown under the same conditions as in Comparative Example 1. In addition, the average temperature at the time of raising seedlings was about 20 ° C. during the day (8:00 to 17:00) and about 8 ° C. at night (17:00 to 8:00).

  As described above, the day when the seedling conditions were changed for each of Examples 2 to 3 and Comparative Example 5 was regarded as the first day, and the growth state of the seedlings up to the 34th day (number of seedlings and the number of true leaves). Was observed. Table 4 shows the results of measuring the height [mm] of the seedlings, and Table 5 shows the results of counting the number of true leaves [sheets]. Here, the height of the seedling and the number of true leaves are average values of arbitrarily selected 5 seedlings. Moreover, FIG. 10 is a graph which shows the relationship between the elapsed days and the height of a seedling in the seedlings of Examples 2-3 and Comparative Example 5.

  It was confirmed that all the seedlings of Examples 2 to 3 and Comparative Example 5 were growing healthy. However, the leaf color of the seedlings of Examples 2-3 was stronger and darker than that of Comparative Example 5.

  Next, the seedlings of Examples 2 to 3 and Comparative Example 5 that were grown as described above were planted (fixed planting interval: 30 cm × 15 cm), and were subjected to sunlight for 22 days until they were grown to the extent that they could be harvested. Grown naturally. In addition, conditions, such as irrigation and fertilization, were made the same as the normal cultivation conditions of Chingensai.

  During this cultivation period, by observing the appearance, flower buds were confirmed on the 15th day after planting in the strains of Examples 2 and 3, but in the strain of Comparative Example 5, flower buds were observed even on the 22nd day. It was not confirmed.

  FIG. 11 (a) is a view showing the structure of the chingensai strain on the 22nd day after the planting of Example 2 in a vertical section, and FIG. 11 (b) shows the chinjinsai shown in FIG. 11 (a). FIG. FIG. 12 (a) is a diagram showing the structure of the chingensai strain on the 22nd day after the planting of Comparative Example 5 in a vertically divided manner, and FIG. 12 (b) is shown in FIG. 12 (a). FIG.

  As is clear from the results shown in FIG. 11, it was confirmed that flowering buds were formed on the dung beetle of Example 2 and extraction was carried out. On the other hand, it was confirmed that no flower buds were formed on the Chingensai of Comparative Example 5.

  As described above with reference to Examples and Comparative Examples, according to the method of inducing flower buds of the Brassicaceae plant of the present invention, it is possible to grow seedlings soundly and reliably form flower buds regardless of the season. It is possible.

It is a block diagram which shows suitable one Embodiment of the flower bud induction | guidance | derivation apparatus of the cruciferous plant of this invention. It is a schematic diagram which shows an example of the light irradiation means 14 in the flower bud induction apparatus 10. 4 is a schematic diagram showing an example of the arrangement of a blue light source 34 and a red light source 36 in the light irradiation means 14. FIG. It is a graph which shows the relationship between the elapsed days and the height of a seedling in the seedling of Example 1 and Comparative Examples 1-4. (A) is a figure which shows the structure | tissue of the seedling of the 30th day of Example 1, (b) is a diagram of the seedling represented in (a). (A) is a figure which shows the structure | tissue of the seedling of the 30th day of the comparative example 1, (b) is a diagram of the seedling represented in (a). (A) is a figure which shows the structure | tissue of the seedling of the 30th day of the comparative example 2, (b) is a diagram of the seedling represented in (a). (A) is a figure which shows the structure | tissue of the seedling of the 30th day of the comparative example 3, (b) is a diagram of the seedling represented in (a). (A) is a figure which shows the structure | tissue of the seedling of the 30th day of the comparative example 4, (b) is a diagram of the seedling represented in (a). It is a graph which shows the relationship between the elapsed days in the seedlings of Examples 2-3 and Comparative Example 5, and the height of a seedling. (A) is a figure which shows the structure | tissue of what divided the strain of the Chingensai of the 22nd day from the fixed planting of Example 2, and (b) is the diagram of the strain of the Chingensai represented in (a). is there. (A) is a figure which shows the structure | tissue of what divided the strain of Chingensai of the 22nd day from the fixed planting of the comparative example 5 and (b) is a diagram of the strain of Chingensai represented in (a). is there.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Flower bud induction | guidance apparatus, 12 ... Nursery room, 14 ... Light irradiation means, 16 ... Power supply control means, 18 ... Temperature control means, 20 ... Temperature sensor, 22 ... Seedling, 24 ... Nursery tank, 30 ... Substrate, 32 ... Semiconductor Light source 34 ... blue light source 36 ... red light source.

Claims (3)

Artificial light containing blue light with a wavelength of 400 to 500 nm emitted from a semiconductor light source and red light with a wavelength of 600 to 700 nm emitted from a semiconductor light source in a nursery room that blocks light from the outside Is irradiated intermittently,
The temperature in the nursery room when irradiating the artificial light is 13 to 20 ° C, the temperature in the nursery room when not irradiating the artificial light is 3 to 7 ° C ,
A flower bud of a cruciferous plant characterized in that the seedling is placed in the nursery room in a state where one or two main leaves are exposed, and the artificial light is intermittently irradiated to the seedling for at least 10 days. Guidance method.   The method according to claim 1, wherein the artificial light comprises only the blue light and the red light. The method for inducing flower buds of cruciferous plants according to claim 1 or 2, wherein the artificial light is irradiated to the seedling continuously for 8 to 10 hours per day.

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