Flowering Induced by Nitrogen Deficiency in Lemna paucicostata 151

概要

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Lemna paucicostata 151 is a weakly responsive short-day plant when grown in non-aseptic ten-fold diluted E medium supplemented with 1 μM 6-benzyladenine, but it flowered even under long-day conditions (continuous light) when grown in this medium for more than 14 days. On the 14th day of culture, the level of endogenous nitrogen in the plants decreased to about 60% of that in the plants inoculated at the start of the culture. The flowering obtained under long-day conditions was suppressed by raising the concentration of nitrogen in the medium, while it was induced more rapidly by lowering the concentration of nitrogen in the medium. Benzyladenine did not cause flowering by itself, but it was required for the flowering that was induced by a reduction in the level of nitrogen in the medium. Thus, the flowering observed under long-day conditions is due to nitrogen deficiency in the plants. Two inhibitors of proteases, bestatin and elastatinal, clearly inhibited the flowering induced by nitrogen deficiency. It appears, therefore, that the induction or activation of some protease(s) is involved in the flowering that is induced by nitrogen deficiency.
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