JPH07322759A - Treatment of plant for raising - Google Patents

Abstract

PURPOSE:To obtain seedlings advanced in flower bud differentiation by irradiating a plant for raising with red light of specific wavelengths under specified conditions to conduct efficient dark/low-temperature treatment to prevent the leaves and stems from unnecessary growth or yellowing. CONSTITUTION:A plant for raising such as strawberry or a kind of Cruciferae vegetables is irradiated with red light 660+ or -50 (pref. 660+ or -30)nm in wavelength having an energy of >=0.6 (pref. 3.2-6.0)mumol/m<2>/sec for 4-16 (pref. 8-12) hr/day to conduct dark/low-temperature treatment. It is preferable that, for strawberry, the low-temperature treatment be made at 10-15 deg.C for 14-21 days, while, for Cruciferae vegetables, at 0-5 deg.C for 20-40 days.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating plants, and more particularly, to prevent overgrowth and yellowing of plants for dark / low temperature treatment of plants for cultivation such as strawberries and cruciferous vegetables. Regarding processing method.

[0002]

[Problems to be solved by the prior art and invention] In autumn forcing cultivation of strawberries and forcing cultivation of cruciferous vegetables such as rapeseed and Chinese cabbage, seedlings with accelerated flower bud differentiation are planted by dark / low temperature treatment. It is recognized that, for example, when strawberry seedlings are continuously placed in a dark state, newly emerged leaves remarkably grow and yellow without forming chlorophyll. Moreover, the leaves are extremely soft and easily broken, which makes it difficult to carry seedlings and to perform planting work such as planting. Also, when returning to natural light,
The formation of chlorophyll also requires a certain period of time. From the above, it is the current situation that the method of cultivating a plant that performs dark / low temperature treatment has been delayed in spread, although it can be cultivated in a relatively inexpensive facility.

In order to prevent such overgrowth and yellowing of plants, plant growth inhibitors have been conventionally applied.
It has been recognized that the prevention of overgrowth by a drug also suppresses flower bud development and suppresses or delays fruit ripening. It is an object of the present invention to provide a dark / low temperature treatment method for cultivating plants, which solves such problems.

[0004]

[Means for Solving the Problems] That is, according to the present invention, when a plant for cultivation is subjected to dark / low temperature treatment, the plant is subjected to 660
Red light with a wavelength of ± 50 nm is 0.6 μmol / m ² / se
The present invention provides a method for treating a plant for cultivation, which comprises irradiating with energy of c or more for 4 to 16 hours / day.

Cultivation plants to which the present invention is applied include cruciform vegetables other than strawberries, and such vegetables include those capable of eating flower stems, such as rapeseed, Chinese cabbage, cabbage, radish, Examples include turnips, Taisai, and Kairan.

These plants are subjected to low temperature treatment in the dark prior to forcing cultivation. This treatment is carried out for the purpose of promoting flower bud differentiation and the like, and is usually -1 to 18
C., 10 to 40 days, preferably 10 to 10 for strawberries
Perform at 15 ° C for 14-21 days. In the case of cruciferous vegetables, it is preferably carried out at 0 to 5 ° C for 20 to 40 days. In the present invention, in the treatment, red light having a wavelength of 660 ± 50 nm, preferably 660 ± 30 nm, is added to the plant in order to prevent overgrowth and yellowing of the plant.
l / m ² / sec or more, usually 1.2 to 12.0 μmol / m
² / sec, preferably 3.2 to 6.0 μmol / m ² / s
ec energy of 4 to 16 hours / day, preferably 8 to
The irradiation is performed for 12 hours / day.

[0007]

EXAMPLES Next, the present invention will be described in detail with reference to Examples. Example 1 Seedlings of strawberry (variety: Onamine) were stored in a warehouse at 15 ° C. for 1 day.
In the dark / low-temperature treatment for 5 consecutive days, the section that is left unexposed in the dark, red light (National Colored Fluorescent Light Pure Red, FL20S / R-F) 20W is daily from 9 am to 17 pm
Area for 8 hours and white fluorescent light (National
A full white fluorescent lamp, FL20SS · N / 18) 18W was provided every day from 9 o'clock every 4 hours for 30 minutes intermittently for 3 times intermittently for 3 times. Also, natural light (85% shade)
The ward was also set up.

The wavelength distribution of red light is in the range of 600 to 700 nm with a peak at 660 nm, and the energy is 3.2 to 1.2 μmol / m ² / se immediately below and at the farthest distance.
It was c (see FIG. 1). Also, white fluorescent lamps are 5.1-1.
It was 5 μmol / m ² / sec.

As a result, in low temperature treatment for 15 days,
The petiole length of the leaves that had been released before the treatment did not differ in the treatment interval, and the leaves newly emerged during the low temperature treatment were 27 cm on average in the dark plot, compared to 15 cm of the other light irradiation plots. It was found to be significantly lengthened (see FIG. 2). When the dark / low temperature treatment was carried out for 33 days, the petiole length of the newly emerged leaves was 25 to 36 cm in the dark area, while it was 11 to 14 cm in the red light irradiation area.

[0010] Therefore, the suppression of the petiole length of the petiole of the new leaf by irradiation with red light was examined as a control in the dark section without irradiation, and it was found that the suppression of elongation of epidermal cells was the cause (see Table 1).

[0011]

[Table 1] Table 1 ─────────────────────────────────── Treatment conditions Petiole length Epidermal cells Number of long epidermal cells Days (cm) (μm) ─────────────────────────────────── 15 Dark area 25.6 184.8 1385 Red light irradiation area 11.3 74.4 1518 ─────────────────────────────────── 33 Dark area 35.6 235.1 1514 Red light irradiation area 13.9 92.4 1504 ────────────────────────────────────

On the other hand, the flower bud differentiation rate was 100% in all plots including the untreated dark plot. The buds and flowering days are 2.5 days and 3.5 days, respectively, in the red light irradiation area compared to the dark area.
It was early (see Figure 3).

Regarding the number of flowers, the number of flowers and the weight of fruit clusters, the red light irradiation group had the largest number, and the appearance rate of axillary clusters was clearly higher in the red light irradiation group. Furthermore, from the developmental status of flower buds, it is considered that red light may be effective not only for preventing overgrowth and yellowing, but also for promoting the photoperiod effect and flower bud differentiation.

Example 2 In Example 1, rapeseed (variety: Kizaquino rapeseed) was used instead of strawberry, and low temperature dark treatment was performed at 3 ± 1 ° C. for 30 days. At that time, red light (National Colored Fluorescent Light Pure Red, FL20S / R-F) 20W is irradiated every day for 12 hours from 6:00 to 18:00 (wavelength distribution of red light: 660n
The peak was at m, and the range was 600 to 700 nm, and the energy was 4 μmol / m ² / sec). As a result, the stem length of the new stem (hypocotyl) was 122.3 mm on average in the dark area, whereas it was 28.1 mm in the red light irradiation area. Therefore, even in the case of cruciferous vegetables such as rapeseed, the stem (hypocotyl) can be prevented from growing under low temperature and dark conditions.

[0015]

INDUSTRIAL APPLICABILITY According to the present invention, low temperature and dark treatment for the purpose of forcing cultivation of strawberries and cruciferous vegetables can be carried out more effectively than the conventional method, and the leaves and stems of stalks and yellows can be effectively treated. Can be prevented. Therefore, it is possible to efficiently obtain seedlings in which flower bud differentiation is promoted. The method of the present invention is also effective for low temperature treatment of bulbs such as tulips, gladiolus and daffodils.

[Brief description of drawings]

FIG. 1 shows a wavelength distribution of red light.

FIG. 2 is a graph showing the effect of light irradiation during low temperature treatment on petiole length.

FIG. 3 is a graph showing the effect of light irradiation during low temperature treatment on buds and flowering days.

Claims (4)

[Claims] 1. A red light having a wavelength of 660 ± 50 nm is applied to a plant for darkening and low temperature treatment at a temperature of 0.6 μm.
A method for treating a plant for cultivation, which comprises irradiating with energy of mol / m ² / sec or more for 4 to 16 hours / day. 2. The method for treating plants according to claim 1, wherein the plants are strawberries or cruciferous vegetables. 3. When the plant is strawberry, the temperature is 10 to 15 ° C.
The method for treating a plant according to claim 1, wherein the low temperature treatment is carried out for 14 to 21 days. 4. When the plant is cruciferous vegetables, 0 to
The method for treating plants according to claim 1, wherein low temperature treatment is performed at 5 ° C for 20 to 40 days.