Flower-promoting effect of some amino acids and amides in Lemna paucicostata 6746

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Cultures of Lemna paucicostata 6746 were exposed to a single 96-hr dark period followed by continuous illumination at 24±1℃. Flowering percentage increased to a maximum 3 days after the end of the dark period and then fell off to 0% on the 5th day. Among 20 amino acids and 2 amides tested, addition of asparagine, aspartate, glutamate, α-alanine, glycine and serine clearly increased the flowering percentages and retarded the regression of floral buds by 2-3 days. These substances given after the end of the long dark period were more effective than those given during the dark period, suggesting that they favored the flower-producing process following the inductive dark process. On the other hand, if the above amino acids or amide were applied under repeated light-dark cycles, they shortened the critical dark period by 1-2 hr and almost completely nullified the light-break effect. They seem to promote the flower-inductive dark process, too. Glutamate, for instance, was effective even at 5 μM, while this amino acid is found in the plant body in large quantities. The mechanism of flower promotion by these amino acids and amide remains unknown.
日本植物生理学会の論文