Plant protecting and regulating compositions – Plant growth regulating compositions – Plural active ingredients
Patent
1997-04-23
1998-09-29
Clardy, S. Mark
Plant protecting and regulating compositions
Plant growth regulating compositions
Plural active ingredients
A01N 3702, A01N 3706, A01N 4322
Patent
active
058145818
DESCRIPTION:
BRIEF SUMMARY
This application has been filed under 35 USC 371 as the national stage of International application PCT/JP95/01093, filed Aug. 25, 1995.
TECHNICAL FIELD
This invention relates to a plant growth promoter. More particularly, it relates to a plant growth promoter composition exhibiting growth-promoting effects for root-crops, potatoes and taroes, cereals, fruity vegetables, pulses, leafy vegetables, fruit-trees, woody plants, flowering plants, and industrial crops.
BACKGROUND ART
It has heretofore been a great problem in agricultural techniques to promote ordinary growth of crops and increase an agricultural production. It is expected that there will be a dearth of food in future in many lands on the globe, and the above-mentioned problem is becoming more important than ever. To solve this problem, many techniques have been proposed for controlling temperature and light irradiation in agricultural facilities, but special equipments or apparatuses are necessary, and the effects of growth promotion and production increase are not proportional to the labor expended.
In recent years, researches have been made on the actions of physiologically active substances isolated from vegetable tissues, which are exerted on the life environment of vegetables, i.e., on germination, growth, florescence, fructification and senescence, for the purpose of growth promotion and production increase. However, only a limited number of physiologically active substances exhibiting growth promotion of vegetables have heretofore been put to practical use, and only few active substances are practicable under the existing circumstances for the growth promotion in field cultivation.
DISCLOSURE OF INVENTION
A primary object of the present invention is to provide a plant growth promoter exhibiting an enhanced activity for the growth of plants.
After thorough research, the inventors have found that a combination of a jasmonic acid or jasmonate with a specific brassinosteroid compound exhibits an enhanced activity for plant growth-promotion, and thus, the present invention has been completed.
In accordance with the present invention, there is provided a plant growth promoter comprising as the active ingredient (i) a jasmonic acid or jasmonate represented by the following formula (1): ##STR3## wherein R.sup.1 is a pentyl or pentenyl group and R.sup.2 is hydrogen or an alkyl group, and (ii) brassinosteroid represented by the following formula (2): ##STR4##
BEST MODE FOR CARRYING OUT THE INVENTION
R.sup.1 in the formula (1) represents a pentyl group or a pentenyl group. As the pentenyl group, a 2-pentenyl group is preferable. R.sup.2 is a hydrogen atom or an alkyl group, and is preferably an alkyl group. The number of carbon atoms in the alkyl group is usually in the range of 1 to 10, preferably 2 to 6, and more preferably 3 or 4. As specific examples of the alkyl group, there can be mentioned methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, t-butyl, n-pentyl, isopentyl, 2-methylbutyl, 1-methylbutyl, n-hexyl, isohexyl, 3-methylpentyl, 2-methylpentyl, 1-methyl-pentyl, n-heptyl, isoheptyl, n-octyl, isooctyl, 2-ethyl-hexyl, nonyl and decyl groups.
The jasmonic acid and jasmonate can be prepared by conventional methods. For example, a dihydrojasmonate, which has a pentyl group as R.sup.1 in formula (1) and an alkyl group having 1 to 10 carbon atoms as R.sup.2 in formula (1), can be prepared by allowing 2-pentylcyclopenten-1-one to react with an alkyl malonate by Michael addition, and then decarboxylating the thus-obtained reaction product.
Brassinosteroid of formula (2) is a known compound, and can be prepared by conventional methods. For example, a method can be employed wherein (22E, 24S)-24S-ethyl-5.alpha.-cholesta-2,22-dien-6-one is incorporated with N-methyl-morpholine-N-oxide and acetone; a catalytical amount of osmium tetraoxide is added to the mixture whereby the former compound is oxidized to give 2.alpha.,3.alpha.-dihydroxy-24S-ethyl-5.alpha.-cholest-22-en-6-one is obtained; the thus-obtained compound is allowed
REFERENCES:
Journal of Plant Growth Regulation (1994) 13:93-108, "Novel Natural Substances Acting in Plant Growth Regulation".
Sembbdner et al. "The biochemistry and the physiological and molecular actions of jasmonates". Ann. Rev.Plant Physiol. Plant Mol. Biol. 44:569-589, 1993.
Meudt, Werner. "Chemical and Biological Aspects of Brassinolide". Chapter 5 in Ecology and Metabolism of Plant Lipids. ACS Symposium Series No. 325. pp. 53-75, 1987.
Hirakawa Shin-ichi
Kamuro Yasuo
Kuriyama Hiroki
Takatsuto Suguru
Watanabe Tsuyoshi
Clardy S. Mark
Nippon Zeon Co. Ltd.
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