Source-Sink Relationship : Control of Photosynthesis in the Flag Leaf by the Panicle in Wheat

概要

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If the sink organs regulate the metabolic activity of the source organs through the transmission of a signal and that signal is chemical in nature, then it should be present among the substances coming out of the panicle. When flag leaf respiration and photosynthesis of wheat (Triticum aestivum L.) cv. HP 1459 were measured with an infrared gas analyser after feeding the flag leaves with the diffusate coming out of the panicle, it was observed that while respiration was unaffected, photosynthesis was sharply inhibited; the inhibition decreased with increasing age of the panicle. Among the known plant growth regulators none could satisfy the requirements of this role with the exception of abscisic acid which was found to inhibit photosynthesis by more than 50% even at 10^<-7> _M, when respiration was affected by only 8%. Apparently, abscisic acid inhibited photosynthesis through its effects on stomatal movement.
日本植物生理学会の論文