Hormonal Regulation of Source-sink Relationship : Effect of Hormones on Excised Source and Sink Organs of Cereals

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The regulatory role of plant growth substances in relation to source and sink activity was studied. Leaching of electrolytes from flag leaf cells increased with age. Abscisic acid, however, increased the permeability of leaf cells at 10^<-4> _M and lower concentrations. Plant growth regulators like auxin, gibberellin and cytokinin at 10^<-5> _M inhibited the leaching of electrolytes but slightly enhanced the process at 10^<-3> _M. The efflux of ^<14>C-sucrose loaded on the flag leaves was not detectable in the very early stage of panicle development but was prominent in the later stages. While auxin prevented sucrose efflux at all stages of panicle development, gibberellin and cytokinin were effective only in different degrees. All the three growth regulators enhanced the activity of α-amylase in the flag leaf cells but protease activity was enhanced only by gibberellin. Synthesis of polymers like starch, DNA, RNA and protein in developing rice grains was stimulated by gibberellin, cytokinin and auxin largely in the order mentioned.
日本植物生理学会の論文