JP3079763B2 - Method for promoting germination and early growth of plant seeds - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for promoting germination and early growth of plant seeds.

[0002]

2. Description of the Related Art In cultivating crops, it is important to improve the germination rate and initial growth of seeds in order to secure a necessary growth amount and obtain a stable yield.
For example, in direct sowing cultivation of rice in flooded soil, seeds are directly buried in paddy soil after shaking, and cultivation can be omitted as compared with mechanical transplant cultivation. However, in cultivation in flooded soil, it is necessary to make the seeding depth uniform in order to stabilize the germination rate and the seedling establishment rate, but the current seeding technique varies the seeding depth. In particular, when the seeding depth is 3 cm or more, the germination rate and the seedling establishment rate decrease due to a physiological disorder due to lack of oxygen, and the growth of rice after germination becomes poor.

[0003] The sowing time of direct sowing cultivation in flooded soil is as follows:
It is carried out from late April to mid-June, but especially when sown from late April to mid-May, there are many opportunities to encounter low temperatures after sowing. Due to obstacles, the seedling establishment rate tends to decrease. As a method for promoting germination and early growth in direct sowing cultivation in flooded soil subjected to various environmental stresses, dressing of seeds with calcium peroxide (Hodogaya Chemical trade name: Calper) has been put to practical use. I have. However, in some cases, the effect of promoting germination and initial growth is insufficient even when dressed with calper, and a method for further improving the effect of promoting germination and initial growth is desired. In addition, a method that eliminates the need to dress the calper is expected.

[0004] On the other hand, uniconazole P is used as a lodging alleviating agent for rice. The method of use is a method of treating a flooded soil with an active ingredient amount of 0.8 to 1.2 g / 10a 20 to 10 days before heading. As a result, the culm length is reduced, and lodging is reduced. Further, uniconazole ((RS)-(E) form) or uniconazole P ((S)-(E) form) was added to rice germinated seeds (germinated seeds) at a concentration exceeding 10 ^-8 M (about 2.91 ppb). It is known that continuous immersion suppresses rice elongation (Plant & Cell Physiol., 25 (4), 611-617 (1984)).

[0005]

Means for Solving the Problems The present inventors have found that when uniconazole or uniconazole P is treated on ungerminated plant seeds, germination is promoted and germination and elongation are suppressed as in the case of treating germinated seeds. The present inventors have found that there is no unexpectedly early growth promoting effect, and completed the present invention.

The present invention relates to a method for promoting germination and early growth of plant seeds (hereinafter referred to as "promoting seeds"), comprising treating an ungerminated plant seed with an effective amount of uniconazole or uniconazole P.
(Referred to as the method of the present invention). Examples of plant seeds include rice, radish, carrots, spinach and the like,
Especially rice.

The form of uniconazole or uniconazole P to be treated in the present invention is not particularly limited, but is preferably in the form of an aqueous solution, and its concentration is usually 0.01
100100 ppb, preferably 0.1-10 ppb.
Examples of the treatment method include a method of dipping seeds before germination in an aqueous solution of uniconazole or uniconazole P, a method of spraying the seeds with the aqueous solution, and a method of dipping the seeds before germination.

When immersing seeds before germination, the immersion time is not particularly limited, but is usually 1 hour or more.
Preferably, it is 5 hours or more. The seed thus treated is washed with water, dried and sown. However, in the case of rice, after washing with water, the rice is germinated by soaking in water at room temperature for 3 to 5 days. The uniconazole or uniconazole P used in the method of the present invention is practically used in the form of wettable powders, flowables, emulsions, liquids, and the like, which are produced by ordinary methods. Also,
It is practically used as a mixture with other plant growth regulators, pesticides such as fungicides, insecticides, herbicides, or fertilizers.

Next, specific examples of preparations containing uniconazole P as an active ingredient are shown, but the preparations used in the method of the present invention are not limited thereto. In the following formulation examples, "parts" means parts by weight. [Formulation example] Liquid preparation Uniconazole P 0.0001 parts Ethanol 1.0 parts Water 98.9999 parts The above are mixed uniformly to form a liquid preparation. Before use, dilute the above solution 10 to 100,000 times with water to reduce the active ingredient concentration.
Use it after adjusting to 0.01 to 100 ppb.

[0010]

【Example】

[Test Example 1] A pre-germinated rice seed (variety: Nipponbare) was immersed for 24 hours in an aqueous solution of a predetermined concentration using the reagent agent prepared according to the above-mentioned formulation example. After washing with water, soak in water to germinate,
Culper (Hodogaya Chemical trade name) was sowed separately in a section where the dressing was performed and a section where the calper was not dressed. Paddy rice topsoil was put into a plastic vat (45 × 30 cm ² , height 15 cm), and 20 seeds were sowed in each treatment section. Seeding was performed using tweezers, and planted at a depth of 3 cm in a greenhouse section and 2 cm in a low-temperature section (a constant temperature of 15 ° C.). Embryos were sprouted and grown in a greenhouse and an outdoor artificial weather chamber (at a constant temperature of 15 ° C.) with a water depth of 3 cm.

[0011] The test was conducted in duplicate, and the greenhouse section was examined 25 days after sowing and the low temperature section was examined 35 days after sowing. The results are shown in Tables 1 and 2.

[0012]

[Table 1] Table 1 Greenhouse ────────────────────────────── Calper uniconazole P Budding rate Plant height Leaf age Living weight powder Clothing concentration (ppb)% cm g / 100 本 Yes 0 60 23.8 2.9 18.3 1 65 24.5 3.0 20.1 10 80 24.8 3.1 23.7 None 0 55 23.2 2.7 15.5 1 60 24.0 2.9 18.3 10 70 24.8 2.9 20.4 ─────────────────────────── ───

[0013]

[Table 2] Table 2 Low temperature zone (15 ℃ constant temperature)） Calper uniconazole P Budding rate Plant height Leaf age Fresh weight Powder coating Concentration (ppb)% cm g / 100 ────────────────────────────── Yes 0 20 4.3 2.1 13.3 1 35 5.5 2.3 15.9 10 50 5.3 2.3 19.8 None 0 5 3.8 1.9 9.5 1 60 4.5 2.1 14.2 10 55 4.8 2.1 13.8 ────────────────────── ────────

[Test Example 2] Carrot seeds (variety: Shin Kuroda 5 sun) before germination were soaked for 1 hour in an aqueous solution of a predetermined concentration of the reagent agent prepared according to the above-mentioned preparation example. After washing and air-drying the carrot seeds, a plastic vat (30 x 45
(cm ² , height 6cm) was filled with dirt and covered with 20 seeds in each treatment area. It was a two-part run. Germination was performed in a greenhouse, and the germination rate was examined 10 days after sowing. The results are shown in Table 3.

[0015]

[Table 3]

Claims (4)

(57) [Claims] 1. A method for promoting germination and early growth of plant seeds, comprising treating an ungerminated plant seed with an effective amount of uniconazole or uniconazole P. 2. The method according to claim 1, wherein the ungerminated plant seed is immersed in an aqueous solution of uniconazole or uniconazole P. 3. The method according to claim 1, wherein the concentration of the aqueous solution of uniconazole or uniconazole P is 0.01 to 100 ppb. 4. The method according to claim 1, wherein the plant seed is rice.