Plant protecting and regulating compositions – Plant growth regulating compositions – Plural active ingredients
Patent
1999-02-25
2000-09-05
Clardy, S. Mark
Plant protecting and regulating compositions
Plant growth regulating compositions
Plural active ingredients
504297, 504312, 504313, A01N 3742, A01N 4312
Patent
active
061142840
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a gibberellin-containing plant growth regulator exhibiting an enhanced gibberellin activity, and a method of regulating plant growth
BACKGROUND ART
Gibberellins are known as a plant growth regulator. Their plant growth regulating activities include, for example, seedless fruitage, maturation period acceleration and fruit enlargement of grape; fruit drop control for persimmon, navel orange and others; growth and development acceleration of Mituba (Cryptotaenia japonica MAKINO), spinach, Japanese butterbur and others; acceleration of growth and development of Udo salad plant (Aralia eordata THIMB) and others by breaking of dormancy; prevention of production of puffy tomato and others; fruit enlargement of cucumber and others; enhancement of number of set fruits of strawberries and others; and bloom acceleration of tulip, cyclamen and other flowers and ornamental plants.
Although gibberellin have various activities as mentioned above, its application is limited because it is expensive and must be applied to crops at a high concentration.
To obviate the difficulties of gibberellin, great progress is being made in development of synergists. For example, plant growth regulators having the following synergists have been proposed: parachlorophenoxyacetic acid (Japanese Examined Patent Publication (hereinafter abbreviated to "JP-B") S57-11281), cyclic-3',5'-adenylic acid (JP-B S57-15726), tryptophan (JP-B S58-27245), streptomycin (JP-B S60-39325), 6-benzyladenine (JP-B S61- 15044), choline (JP-B H5-78522), pyrazole compounds (Japanese Unexamined Patent Publication (hereinafter abbreviated to "JP-A") H4-199104) and abscisic acid (JP-A H5-139912). Most of the proposed plant growth regulators still have problems such that gibberellin must be applied at a high concentration, e.g., 100 ppm, for seedless fruitage and fruit enlargement of grapes, and the effect of plant growth regulation is not satisfactory.
Jasmonic acid esters represented by the general formula (1), below, are known compounds, which are described in WO94/18833. It is reported that the jasmonic acid esters have activities such as coloring improvement and sweetness enhancement of fruits of grape; growth and development acceleration of potatoes, rice, wheat and others; and fruit enlargement of strawberry, tomato and others. However, the activities of the jasmonic acid esters as observed when they are used alone, are not satisfactory for some crops.
DISCLOSURE OF THE INVENTION
To solve the problems of the prior art, the inventors made extensive researches, and found that the amount of gibberellin can be reduced as described in Plant Hormone Handbook (I), page 15, published by Baifukan, Japan, by the combined use of gibberellin with specified jasmonic acid esters, and further found that gibberellin and the jasmonic acid ester synergistically act for the effects of plant growth regulation such as growth and development acceleration, fruit enlargement, seedless fruitage, and germination acceleration, which effects cannot be obtained with the single use of these active ingredients. Based on these findings, the present invention has been completed.
In accordance with the present invention, there is provided a plant growth regulator which comprises, as active ingredients, gibberellin and a jasmonic acid ester represented by the general formula (1): ##STR2## wherein each of R.sup.1 and R.sup.2 represents a hydrocarbon group, at a ratio (gibberellin/jasmonic acid ester) of 1/0.001 to 1/1,000,000 by weight.
Further, in accordance with the present invention, there is provided a method of regulating growth of a plant which comprises applying to crops gibberellin and a jasmonic acid ester represented by the above general formula (1) in combination. The combined application of gibberellin and the jasmonic acid ester can be effected either by a procedure of applying a mixture of these two active ingredients, or by a procedure of applying separately the two active ingredients, i.e., a procedure wherein, while the earlier ap
REFERENCES:
patent: 3821864 (1974-07-01), Stottlemyer
patent: 5776860 (1998-07-01), Kamuro et al.
Fujisawa Hiroshi
Kamuro Yasuo
Morishige Nada
Clardy S. Mark
Nippon Zeon Co. Ltd.
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