Plant growth promoter

Details Plant growth promoter Plant growth promoter

1995-08-25

1998-07-07

Robinson, Allen J.

Plant protecting and regulating compositions

Plant growth regulating compositions

Organic active compound containing

504320, A01N 3700

Patent

active

057768609

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

This application is a 371 of PCT/JP94/00303, filed Feb. 25, 1994.
The present invention relates to a plant growth promoter. More particularly, the present invention relates to a plant growth promoter applied to root vegetables, potatoes (tuber crops), cereals, fruit vegetables, fruit trees, flowers and ornamental plants, industrial crops, etc.
Promotion of ordinary growth and development of crops for their increased production has been a big task in the agricultural technology. This task is becoming more important because food shortage on global scale is anticipated in the future.
The method for achieving the task includes a method by a technique employing an agricultural facility capable of controlling the temperature, light, etc. applied. This method, however, has had problems in that the facility and equipment therefor are required and that the method has a limitation as compared to the labor needed for said control.
Meanwhile, there have recently been made attempts of isolating a physiologically active substance from plant tissue samples and studying its effect on the life cycle (germination, growth, blooming, bearing and aging) of plants in order to promote their growth and development for increased production. However, the number of cases is very small yet in which a physiologically active substance having a plus effect on the growth and development of plants has been put into practical use. Moreover, the number of substances is also very small which can exhibit a growth promotion action on plants in their actual outdoor cultivation.
Under the above situation, the present inventors made an extensive study and, as a result, found out that certain jasmonic acid derivatives have a growth promotion action on plants. The finding has led to the completion of the present invention.
According to the present invention there is provided a plant growth promoter comprising, as an active ingredient, a jasmonic acid derivative represented by the following formula: ##STR2## wherein R.sup.1 represents a pentyl group or a pentenyl group and R.sup.2 represents a hydrogen atom or an alkyl group.
According to the present invention there is also provided a plant growth promoter comprising, as active ingredients, a jasmonic acid derivative and a brassinosteroid.
The jasmonic acid derivative represented by the formula (1), according to the present invention is restricted to those jasmonic acid derivatives wherein R.sup.1 is a pentyl group or a pentenyl group and R.sup.2 is a hydrogen atom or an alkyl group. The pentenyl group is preferably 2-pentenyl group. The alkyl group is exemplified by methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group and decanyl group. R.sup.2 is preferably an alkyl group of 2-6 carbon atoms, particularly preferably an alkyl group of 3 or 4 carbon atoms.
Each of these jasmonic acid derivatives is a known compound and can be produced by an ordinary process. For example, a dihydrojasmonic acid derivative which is a jasmonic acid derivative of formula (1) having a pentyl group as R.sup.1 and an alkyl group of 1-10 carbon atoms as R.sup.2, can be obtained by subjecting, to Michael addition, 2-pentylcyclopentene-1-one and an alkyl malonate and then subjecting the resulting adduct to decarboxylation.
The content of the jasmonic acid derivative in the plant growth promoter of the present invention cannot be specified in a general range because it varies depending upon the kind of plant to which said promoter is applied, the form, method and timing by and at which said promoter is used, etc. However, when the plant growth promoter is used in the form of a solution and by spraying, said content is controlled in a concentration of generally 0.01-500 ppm, preferably 0.05-300 ppm, more preferably 0.1-200 ppm.
When the concentration is outside the above range, the concentration is not economical; the growth promotion effect of the present promoter is not expressed in some cases; and even the growth

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