Zwergwuchs und Abscisinsäure

Summary Extracts from actively growing parts of dwarf rice plants (stem apex and basal parts of the leaves) contained a higher amount (up to 50 %) of abscisic acid (ABA) than those from tall plants. The ABA content of the leaf blades did not show significant differences. Application of various concentrations of ABA either to etiolated rice coleoptile sections or to intact green rice seedlings growing in a water culture revealed a different sensibility to ABA of dwarf and tall plants. Therefore it is concluded that dwarfism not only depends upon the endogenous amount of gibberellins. The content of inhibitors as well as the sensibility of the plant to them may also play a certain role.