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Plant and Cell Physiology, 1984, Vol. 25, No. 6 929-933
© 1984

Article

Effects of Ferrous and Phosphate Ions on Flowering in Lemna paucicostata 6746 in Diluted Hutner's Medium

Hiroyuki Mori

Biological Institute, Nagoya University Chikusa, Nagoya 464, Japan

In Lemna paucicostata 6746, P2 (flower induction period) in continuous darkness was largely extended by dilution of 1/2 H1S medium (Hutner's medium supplemented with 1% sucrose) to 1/10 strength. The dilution of 1/2 H1S medium to 1/10 strength removed completely the extension of P1 (pre-flower induction period) and P2 due to a red light pulse given at the 7th h of the dark period, which was observed in 1/2 H1S medium.

When iron and phosphate ions were added to 1/10 H1S medium up to the same concentration as in 1/2 H1S medium, the extension of P2 was removed completely. The red light pulse-induced extension of P1 was observed in 1/10 H1S medium only when iron ions were added. It is suggested that iron (Fe$ $) and phosphate ions are important in determining the rate of photoperiodic flower induction in L. paucicostata 6746.

(Received December 23, 1983; Accepted June 6, 1984)
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