Natural growth inhibitors associated with the cotyledon effect in light-grown dwarf and tall beans

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The contents of non-acidic, acidic and bound growth inhibitors in hypocotyls and cotyledons were compared between dark- and light-grown dwarf and tall beans by means of thin-layer chromatography and bioassay. In the non-acidic fraction, one major inhibitory activity appeared on the chromatogram, but its Rf zone was different between hypocotyls and cotyledons. In both the acidic and bound inhibitor fractions, one major inhibitory activity appeared at the Rf zone corresponding to ABA. The ABA-like substance which was the major inhibitor in the hypocotyl was more abundant in light-gorwn than dark-grown ones, especially in the dwarf variety, but light irradiation did not cause its transport from cotyledons to the hypocotyl. A larger amount of bound ABA-like substance, which was the major inhibitor in the cotyledon, was present in the dwarf than the tall variety regardless of the light condition. Cotyldon-enhanced photo-inhibition of hypocotyl growth could not be explained by the levels of the xanthoxin-and ABA-like inhibitors, or the transport of these free inhibitors from cotyledons.
日本植物生理学会の論文