Suppression of long-day flowering by nitrogenous compounds in Lemna perpusilla 6746

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The long-day flowering of Lemna perpusilla 6746 on an SH inhibitor-containing medium was inhibited by the application of ammonium ion to the medium. Ammonium ion not only suppressed long-day flowering, but relieved the inhibition of vegetative growth caused by the inhibitors. Nitrite, casamino acids, glutamine and asparagine had a similar effect, suggesting that the inhibition of long-day flowering by ammonium ion is not a direct effect of the ion. Most amino acids, with the exception of glutamate and aspartate, also prevented long-day flowering, but their effects on vegetative growth varied. No qualitative differences in amino acid composition were observed among plants cultured on media containing nitrate, nitrite or NH_4NO_3 as the sole nitrogen source. However, the amounts of free and total amino acids were higher in plants fed with nitrite or NH_4NO_3 than in those fed with nitrate. This suggests that the inhibition of long-day flowering by ammonium and nitrite can be ascribed to increased nitrogen metabolism. Though decreased activity by SH inhibitors of nitrate reductase (SH enzyme) is assumed to result in long-day flowering by lowering the nitrogen metabolism, lowering the nitrogen level in M medium did not bring about floral initiation in the absence of SH inhibitors.
日本植物生理学会の論文