Flower Induction by Suppression of Nitrate Assimilation in Lemna paucicostata 6746 :

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Abstract

In vitro activity of nitrate reductase was studied in Lemna paucicostata 6746 grown on modified Hoagland medium supplemented with 1% sucrose, containing various inhibitors. Copper, silver, tungstate or cyanide which induces daylength-independent flowering, inhibited the nitrate reductase activity, but azide which does not induce daylength-independent flowering did not. Molybdate-deficient medium induced flowering, and inhibited nitrate reductase activity. Lowering of nitrate level of the medium also induced daylength-independent flowering. These results suggest that the suppression of nitrate assimilation causes daylength-independent flowering in Lemna paucicostata 6746, and that one of the flower-inducing actions of the copper, silver, tungstate, cyanide or the deletion of molybdate is to suppress the nitrate assimilation.

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