Abstract: The present invention relates to a plant growth regulator comprising as an active ingredient an epoxycyclohexane derivative represented by general formula (1): ##STR1## wherein R.sup.1 is a hydrogen atom, a C.sub.1 -C.sub.6 alkyl group or C.sub.3 -C.sub.6 cycloalkyl group, and R.sup.2 and R.sup.3 are independently C.sub.1 -C.sub.6 alkyl groups or are combined to form a C.sub.2 -C.sub.3 polymethylene group which may be substituted with a C.sub.1 -C.sub.6 alkyl group, as well as to a plant growth regulator comprising the epoxycyclohexane derivative and a brassinosteroid as active ingredients. The epoxycyclohexane derivatives exhibit a potent plant growth regulating action which is equivalent to or higher than that of abscisic acid, and are useful as plant growth regulators such as a plant growth accelerator, a germination growth accelerator, a transpiration and wilting inhibitor, a cold resistance enhancer, an accelerator for growing, thickening or maturing fruits, roots, stems or bulbs, etc.

Abstract: A plant growth promoter comprising as the active ingredients (i) a jasmonic acid or jasmonate of the formula (1): ##STR1## wherein R.sup.1 is pentyl or pentenyl and R.sup.

Abstract: The present invention relates to a plant growth regulator comprising as an active ingredient an epoxycyclohexane derivative represented by general formula (1): ##STR1## wherein R.sup.1 is a hydrogen atom, a C.sub.1 -C.sub.6, alkyl group or C.sub.3 -C.sub.6 cycloalkyl group, and R.sup.2 and R.sup.3 are independently C.sub.1 -C.sub.6 alkyl groups or are combined to form a C.sub.2 -C.sub.3 polymethylene group which may be substituted with a C.sub.1 -C.sub.6, alkyl group, as well as to a plant growth regulator comprising the epoxycyclohexane derivative and a brassinosteroid as active ingredients. The epoxycyclohexane derivatives exhibit a potent plant growth regulating action which is equivalent to or higher than that of abscisic acid, and are useful as plant growth regulators such as a plant growth accelerator, a germination growth accelerator, a transpiration and wilting inhibitor, a cold resistance enhancer, an accelerator for growing, thickening or maturing fruits, roots, stems or bulbs, etc..

Abstract: Brassinosteroid derivatives expressed in formula (I) and formula (II) ##STR1## and a plant growth regulator containing one type or two types of these brassinosteroid derivatives as active ingredient.The invention thereby presents novel brassinosteroid analogous compounds expressed in formula (I) and formula (II) and a plant growth regulator containing these compounds showing a persisting plant growth regulating action.

Abstract: Disclosed herein is a novel brassinosteroid derivative represented by the formula: ##STR1## wherein R.sub.3 represents C.sub.1-2 -alkyl,R.sub.1 and R.sub.2 which may be the same or different, represent hydrogen or acyl, respectively, otherwise R.sub.1 and R.sub.2, combining together, may form ##STR2## wherein R.sub.4 and R.sub.5 represent C.sub.1-2 -alkyl, and R.sub.3 represents methyl only in this case.The brassinosteroid derivative represented by the above formula (I) exhibits a favorable plant growth regulating effect on various plants in agriculture and horticulture.

Abstract: A process for producing a steroid compound which is useful as an intermediate for synthesizing plant growth regulators, brassinosteroids, and is represented by the general formula (4): ##STR1## in which R.sub.2 is a methyl or ethyl, and * indicates the binding site of R.sub.1 to a steroid nucleus, or general formula (5): ##STR2## wherein R.sub.1 is as defined above. According to the process disclosed herein, an intermediate for a brassinolide, epibrassinolide, homobrassinolide or derivatives thereof can be produced highly advantageously in the industries.