Comparison between Induction of Flowering by Nitrogen Deficiency and that by Short Days or Continuous Irradiation with Blue or Low-Intensity White Light in Lemna paucicostata 6746

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Flowering of Lemna paucicostata 6746, a short-day plant, is induced by nitrogen deficiency or by the suppression of nitrate reductase activity under continuous light. The plant also flowers under continuous blue or low-intensity white light. However, the nitrate reductase activity and levels of endogenous nitrogen of the plants did not decrease under these conditions. Glutamine synthetase activity decreased slightly in darkness, but daylength-independent flowering was not induced by the suppression of the enzymatic activity by methionine sulfoximine. Endogenous nitrogen levels of plants grown on nitrogen-deficient medium at 30℃ fell more rapidly than those of plants grown at 25℃, and thus difference was expressed as an enhancement of flowering at 30℃. Photoperiodic flowering was greatly suppressed by exposure of plants to a high temperature (30℃) during the dark period, whereas the flowering induced under continuous blue or low-intensity white light was enhanced only slightly by high temperature during culture.
日本植物生理学会の論文