Inhibition of Flowering in the Long-Day Plant Lemna gibba G3 by Hutner's Medium and its Reversal by Medium Modification

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The long-day plant Lemna gibba G3 flowers normally in E medium (Hoagland-type medium plus 30 μM EDTA) but in 0.5 H medium there is no flowering. Ammonium is present in 0.5 H medium and is known to inhibit flowering in L. gibba G3, but even in NH_4^+-free 0.5 H medium there is virtually no flowering under continuous light. In-creasing the phosphate concentration of the NH_4^+-free 0.5 H medium from 1,15 mM to 12 or 16 mM results in substantial flowering. Decreasing the EDTA concentration from 850 μM to 250 μM, or raising the nitrate concentration from 4 mM to 12 mM, results in only a small increase in flowering. If the decrease in EDTA and increase in nitrate are combined with the increase in phosphate, however, the flowering response is nearly as good as that obtained using E medium. Thus, with these three changes the inhibitory effect of NH_4^+-free 0.5 H medium for flowering in L. gibba G3 is almost completely reversed. In the above studies flowering was not limited by daylength. When plants were grown on E medium under an 11 hour daylength where flowering is limited by day-length, decreasing the phosphate concentration in the medium reduced flowering, but increasing the phosphate concentration in the medium did not stimulate flowering. Thus, when flowering is limited by daylength, high phosphate will not cause flowering, but a certain level of phosphate appears to be necessary for the expression of photo-induction under long days.
日本植物生理学会の論文

Inhibition of Flowering in the Long-Day Plant Lemna gibba G3 by Hutner's Medium and its Reversal by Medium Modification

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