JPH06256105A - Plant flowering inducer - Google Patents

Abstract

PURPOSE:To provide a plant flowering inducer containing a compound such as a polyamine. CONSTITUTION:This is a plant flowering inducer containing one or more kinds of compounds among diamines represented by formula RHN(CH2)nNHR' [R and R' are each a hydrogen atom or a lower alkyl group. R and R' may be same or mutually different; (n) is an integer of 2 to 9] and salts thereof as the active components. Plant flowering controlled by nature can be artificially controlled and, therefore, a very advantageous culture can be carried out.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a flowering inducer in plants.

[0002]

2. Description of the Related Art The flower bud formation of a plant is delicately controlled by its own regulatory mechanism that works due to changes in day length, seasonal changes, temperature, and the like. Among these, the photoperiod is the most important factor, and due to the length of photoperiod that forms flower buds,
Classified as long-day plants and neutral plants.

For example, morning glory is a horticultural flower peculiar to Japan that was grown in the Edo era with a creeping plant belonging to the family Convolvulaceae native to tropical America or tropical Asia. However, morning glory is a typical short-day plant, and the photoperiod is a decisive factor in its flower bud formation. For example, in the case of Kuki, which is one cultivar of morning glory, flower buds are not formed unless there is a continuous dark period longer than the critical dark period (8 hours 45 minutes). As such, morning glory is a flower plant that is widely popular, but its use is limited due to its short-day nature, so if it can induce flowering in long-term, oligotrophic conditions, its consumption can be greatly expanded. Expected

[0004] Asparagus is widely consumed in root-root vegetables, but males and females have different strains, and the quality and yield of males and females differ. If the male and female strains can be distinguished at an early stage and only the male strains can be cultivated, not only the production amount but also the quality can be improved, so that the development thereof is strongly required. However, under the present circumstances, asparagus cannot discriminate between males and females as they wait for natural flowering.

As described above, if artificial flowering of plants controlled by nature can be easily induced artificially, it is expected to be applied in various fields.

Shinozaki et al. Reported that the flower bud formation of plants was induced by physical stress such as low temperature conditions or suppression of root elongation (Me.
m. Coll. Agric. Kyoto Univ. N
o. 126: 1-20), there is no report that a chemical substance induced flower bud formation of plants.

[0007]

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a plant flowering inducer that can be advantageously cultivated by inducing flower bud formation of a plant using a chemical substance. .

[0008]

[Means for Solving the Problems] In view of the above circumstances, the present inventors have conducted extensive studies as a result of developing a drug having an effect of inducing flowering of plants, and as a result, have the activity of certain polyamines. The present invention was completed by finding out that there are compounds.

That is, according to the present invention, formula (1): RHN- (CH ₂ ) _n -NHR '(1) (wherein R and R'are the same or different and each represents a hydrogen atom or a lower alkyl group). , N represents an integer of 2 to 9), and a plant flowering inducer containing at least one diamine represented by the formula (2) to (9) or a salt thereof as an active ingredient.

In the formula (1), the lower alkyl group represented by R and R'is a linear or branched alkyl group having 1 to 4 carbon atoms, such as methyl group, ethyl group and n-propyl group. Group, isopropyl group, butyl group and the like. Examples of the salt include salts of inorganic acids such as hydrohalic acid (hydrochloric acid, hydrobromic acid, etc.), sulfuric acid, phosphoric acid, etc., and organic acids such as acetic acid, propionic acid, oxalic acid, malonic acid, benzoic acid, etc. Mention may be made of salt.

Most of the compounds represented by the formula (1) are known compounds and are commercially available as reagents.
If necessary, a known synthesis method (Org. Syn., Col.
vol. IV, 819, 1963, Ber. , 18, 2
956, 1885, etc.).

The flowering inducer of the present invention can be produced by incorporating at least one compound represented by the above formula (1) or a salt thereof as an active ingredient. That is, the compound is dissolved in water as it is, or is dissolved in an appropriate solvent and then diluted with water before use. Also,
Add a suitable carrier, solvent, surfactant, etc., if desired,
It can also be used by formulating it in the form of a wettable powder, an emulsion or the like.

[0013]

The present invention will be described in more detail below with reference to test examples, but the present invention is not limited by these test examples.

In the following test examples, as typical examples of the compound represented by the formula (1), commercially available 1,3-diaminopropane (compound 1), putrescine (compound 2), cadaverine (compound 3), 1 , 6-diaminohexane (compound 4), 1,7-diaminoheptane (compound 5), 1,
The test was conducted using 8-diaminooctane (compound 6), 1,9-diaminononane (compound 7) and N, N'-dimethylethylenediamine (compound 8).

Test Example 1 Flower Bud Induction Test for Morning Glory (Killer ) Morning Glory Seeds (Pharbitis nil, cv. K)
Ichida) is prepared in the required number, soaked in concentrated sulfuric acid for 50 minutes,
After removing the hard seed coat, it was washed with water for 1 day. After that, the seeds were arranged on a petri dish lined with moistened sand, and placed at 20 ° C. under continuous light (5000 lux) for 1 day. After one day, the petri dish on the sand of the petri dish had already rooted, so it was buried in a vat filled with sand that had been appropriately dampened. In this state, it was left for 3 days under continuous light (5000 lux) at 20 ° C. Since most of the seeds germinated in this state, the germinated seeds (seedlings) were transplanted to a poor nutrient medium containing an aqueous solution of the test compound at a predetermined concentration, and the seeds were cultivated at 20 ° C. under continuous light (5000 lux) for 24 days. Hydroponically grown. Then, after transplanting to a nutrient medium and growing under the same conditions for 2 weeks, the presence or absence of flower bud formation was observed under a microscope. The induction rate (%) was calculated from the number of individuals in which flower bud formation was induced. The results obtained are shown in Table 1.

[Table 1]

Test Example 2 Test compound 3 for inducing flower bud formation of asparagus was diluted with water to prepare a solution having a concentration of 10 μM.
Seeds of asparagus (variety Mary Washington) were immersed in the above solution and left at 25 ° C for 12 days. The seeds were washed with water, sown in soil, and cultivated at 25 ° C. for 12 hours with a photoperiod of 13 days. The presence or absence of flower bud formation in the obtained seedlings was observed under a microscope. As a result, flower bud formation was observed in about 30% of the seedlings.

[0017]

EFFECTS OF THE INVENTION By using the agent for inducing flower bud formation of the present invention, it is possible to artificially control flowering of a plant which is naturally controlled, for example, morning glory can be flowered even after long days. Therefore, cultivation can be performed extremely advantageously.

Claims (2)

[Claims] 1. A formula _{(1): RHN- (CH 2} ) n -NHR '(1) ( wherein, R and R' are the same or different and represent a hydrogen atom or a lower alkyl group, n 2 A plant flowering inducer containing as an active ingredient at least one compound of a diamine or a salt thereof represented by an integer of up to 9). 2. The flowering inducer according to claim 1, wherein the plant to be applied is a morning glory genus.