JP4601370B2 - How to grow ornamental plants - Google Patents

Description

  The present invention relates to a method for growing a flowering ornamental plant that has been hatched by the action of a gibberellin biosynthesis inhibitor, and particularly relates to a method for growing an ornamental plant.

  Conventionally, when a plant is hatched from the viewpoint of breeding and horticulture, a method of suppressing the biosynthesis of gibberellin, a plant growth-promoting hormone, by administering a gibberellin biosynthesis inhibitor such as uniconazole to the plant is known. ing. This gibberellin is a hormone synthesized in the plant body, and has effects such as flowering promotion and fruit enlargement in addition to promoting growth.

  However, as described above, since gibberellin is also involved in flowering, inhibition of gibberellin biosynthesis for hatching has a considerable effect on flowering. For example, in the case of sunflower, as shown in FIG. 3, under white light (fluorescent lamp), the flowering rate is 100% when untreated, whereas when uniconazole is treated, inflorescence formation is suppressed, Not only does the flowering rate drop to 20%, but the flowering time is also delayed.

However, when plant hormones such as gibberellins are externally administered as drugs to promote flowering (for example, Patent Document 1), the hatching effect of uniconazole, which is a gibberellin biosynthesis inhibitor, is reduced. There is a risk that stem elongation, which causes the appearance disorder, is promoted. In addition, the flowering effect of plant hormones is greatly influenced by individual differences and the environment, and there is a problem that it is extremely difficult to judge the dose and the timing.
JP-A-8-298868

  In view of these problems, the present invention was made for the first time by the inventor of the present invention after finding out the influence of light quality on flowering of a hatched plant, and the plant was hatched. However, it was intended to ensure that the flowers bloom securely and safely.

  That is, the method for growing an ornamental plant according to the present invention allows a gibberellin biosynthesis inhibitor to act on the ornamental plant, and only a predetermined monochromatic light determined according to the variety of the plant for at least a certain period before flowering. And the flowering inhibitory effect of the gibberellin biosynthesis inhibitor is reduced while maintaining the hatching action of the gibberellin biosynthesis inhibitor.

  A more specific method for growing an ornamental plant according to the present invention is to allow a gibberellin biosynthesis inhibitor to act on an ornamental sunflower and to irradiate only yellow monochromatic light for at least a certain period before flowering. The flowering inhibitory effect of the gibberellin biosynthesis inhibitor is reduced while maintaining the hatching action of the gibberellin biosynthesis inhibitor.

  Here, the yellow monochromatic light is preferably light having a wavelength in a range of ± 20 nm centering on 590 nm.

  In order to advance the flowering time and to make the flowering more reliable, it is preferable to further administer a predetermined amount of gibberellin.

  According to the present invention configured as described above, even when a plant is hatched from the viewpoint of breeding and horticulture, the flowering is performed in a very safe and reliable manner by simply irradiating the plant with monochromatic light unique to the plant. A decrease in rate can be suppressed. In addition, for example, even when an agent that promotes flowering such as gibberellin is added after the hatching treatment, the effect of promoting stem elongation that causes disturbance of the grass shape can be reduced and the hatching effect can be maintained. And by using such a method for agricultural production, it becomes possible to greatly increase the possibility of developing new agricultural products.

  An embodiment of the present invention will be described below with reference to the drawings.

  <Materials and methods>

  In this embodiment, dwarf sunflower (Helianthus annuus) 'Pinothio' is used as an ornamental plant.

The seeds were directly sown in an 88-well cell tray filled with Metromics and grown under irradiation with a white fluorescent lamp (100 μmol · m ⁻² · s ⁻¹ PPFD).

  On the 19th day after sowing, in which two true leaves were fully developed, 1 ml of 100 mg / l uniconazole was pre-treated as a pretreatment, and 1 ml of distilled water was irrigated in the control group, which were designated as a U-treated group and an untreated group, respectively.

On the next day, the plant 11 was immediately moved under the various LED irradiation facilities 10 (see FIG. 1), and irradiation with monochromatic light was started. LED irradiation was performed in 5 irradiation sections (peak wavelength: 470 nm: blue, 500 nm: blue green, 525 nm: green, 590 nm: yellow, 660 nm: red), and a white fluorescent lamp irradiation section was provided as a control light irradiation section. The light / dark cycle was 16 hours of irradiation / 8 hours darkness, the cultivation temperature was 24 ± 2 ° C., and the irradiation intensity was adjusted so that the irradiation intensity was 40 μmol · m ⁻² · s ⁻¹ PPFD on the soil surface in each irradiation section.

  Plant height was investigated every other week from the start of LED irradiation, and flowering dates were recorded as needed. The dismantling investigation was conducted 60 days after the start of LED irradiation (80 days after sowing). Here, the “flowering date” refers to the point in time when the tongue-shaped flower has developed and the cylindrical flower is visible, and 8 to 10 sunflowers are planted in each irradiation section in one treatment section.

  <Results and discussion>

  (1) The flowering rate in each irradiation section obtained as a result is shown as a graph in FIGS. Looking at the effect of light quality on the flowering rate, in the untreated area, the flowering rate is 100% in the fluorescent light irradiation area, the blue light irradiation area, the green light irradiation area, the yellow light irradiation area, and the red light irradiation area. In the irradiated area, it was 80%. That is, it can be seen that the flowering rate is 100% in almost all irradiated sections in the untreated section.

  On the other hand, the flowering rate of the U treatment group was maintained at 100% only in the yellow light irradiation group, and there was no significant delay in the flowering time. However, in the other irradiation areas, that is, in the fluorescent lamp irradiation area and the red light irradiation area, the flowering rate drops greatly to 20% and 40%, respectively, and in the green light irradiation area, the blue light irradiation area, and the blue-green light irradiation area, flowering occurs. The rate was 0%, and no flowering was observed within a certain cultivation period.

  In addition, the number of days until flowering in all irradiation groups tended to be slower in the U-treated group than in the untreated group.

  (2) From the above, regarding the flowering, it can be inferred that the flowering rate is 100% only in the yellow light irradiation section and also in the U treatment section, and the yellow light has the effect of promoting sunflower flowering. The example that suggested the action of such yellow light has never been before and is very unique.

  If this action is used for agricultural production, for example, a sunflower ultra-minipot flowering strain can be commercialized. That is, the cocoon treatment is an effective method for minipot production, but if it is left as it is, the flowering of sunflower is greatly delayed. However, even if it is treated with a dwarfing agent, if it is cultivated under yellow light, 100% flowering can be induced at an early stage.

  <Other embodiments>

  The present invention is not limited to the above embodiment. For example, plants are not limited to sunflowers, and yellow light (especially light having a peak wavelength in the range of ± 20 nm centered on 590 nm) is considered to promote flowering in other plants as described above. Of course, some varieties may be effective for light of other wavelengths. In any case, the growing method of inducing flowering by applying only a monochromatic light unique to the plant and inducing the flowering for a certain period before flowering after treatment with a fermenting agent is very unique. By using it, it is considered possible to greatly increase the possibility of developing new agricultural products.

  In the above embodiment, the light source is an LED because it is highly efficient, generates less heat, and is easy to control. However, for example, a desired monochromatic light may be extracted from white light by a filter.

Further, a predetermined amount of gibberellin may be administered at a predetermined time while irradiating with yellow light. FIG. 8 shows a case in which 50 mg / l and 100 mg / l of GA ₃ (a kind of gibberellin) is applied as a post-treatment in the yellow light irradiation section five times on the first, 14, 21, 28 and 35 days after the pre-treatment The data regarding the flowering at the time of foliar application (about 1 ml amount) are shown. As is clear from the figure, it can be seen that flowering is further accelerated by this treatment. In the figure, “U + GA50” indicates data when 50 mg / l GA ₃ is administered, and “U + GA100” indicates data when 100 mg / l GA ₃ is administered.

  On the other hand, FIG. 9 shows the stem length when gibberellin is administered from the outside in order to promote flowering as described above. Here, for comparison, the result of performing the same post-processing in each irradiation section is also displayed. As shown in the figure, in the yellow light irradiation section, the plant height is lower than that when irradiating with a white fluorescent lamp while maintaining a flowering rate of 100%, and the yellow light suppresses only the growth effect of gibberellin to some extent. It can be seen that the flowering rate is 100% while maintaining a considerable hatching effect. Incidentally, although the flowering rate is improved in the red light irradiation section, the blue light irradiation section, the blue-green light irradiation section, and the green light irradiation section, the plant height is longer than that in the case of irradiation with white fluorescent lamp light. That is, the effect by uniconazole treatment is suppressed, and the hatching effect is suppressed.

  Therefore, it is considered that by combining light quality control and gibberellin administration in this way, it is possible to control the flowering time and further improve the flowering rate while maintaining the hatching effect.

  In addition, the present invention is not limited to the illustrated examples and explanation examples, and some or all of the above-described configurations may be combined as appropriate, and various modifications may be made without departing from the spirit of the invention. .

  By utilizing the method according to the present invention for agricultural production, it is considered possible to greatly increase the possibility of developing new agricultural products.

The schematic diagram which shows the cultivation system of the sunflower in one Embodiment of this invention. The time-dependent graph which shows the difference in the flowering rate in the untreated group and uniconazole treated group when yellow light is applied. The time-lapse graph which shows the difference in the flowering rate in the untreated group and uniconazole treated group when a fluorescent lamp (white light) is applied. The time-lapse graph which shows the difference in the flowering rate in the untreated group and uniconazole treated group when blue light is applied. The time-course graph which shows the difference in the flowering rate in the untreated group and uniconazole treated group when green light is applied. The time-dependent graph which shows the difference in the flowering rate in the untreated group and uniconazole treated group when blue-green light is applied. The time-dependent graph which shows the difference in the flowering rate in the non-treatment group at the time of applying red light, and a uniconazole treatment group. The time-dependent graph which shows the difference in the flowering rate by the case where yellow light is irradiated and the case where gibberellin is administered in addition to yellow light irradiation. The graph which shows the influence with respect to the stem length (plant height) of each light quality in each process section.

Explanation of symbols

10 ... LED irradiation facility 11 ... plant

Claims (3)

  A method for growing an ornamental plant characterized by allowing a gibberellin biosynthesis inhibitor to act on an ornamental sunflower and irradiating it with only yellow monochromatic light for at least a certain period before flowering. . The monochromatic light yellow, method for growing ornamental plants according to claim 1, wherein the light of a peak wavelength in the range of ± 20 nm around the 590 nm. The method for growing ornamental plants according to claim 1 or 2 , wherein gibberellin is further administered before flowering .