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Plant and Cell Physiology, 1984, Vol. 25, No. 6 923-928
© 1984

Article

Induction and Production of Flowers in a Short-Day Duckweed, Lemna paucicostata 6746, in Diluted Hutner's Medium in Uninterrupted and Interrupted Darkness

Hiroyuki Mori

Biological Institute, Nagoya University Chikusa, Nagoya 464, Japan

Kinetics of induction and production of flowers were studied in Lemna paucicostata 6746 cultured in 1/4, 1/10, 1/20 and 1/80 H1S media (Hutner's media supplemented with 1% sucrose).

In continuous darkness, the floral parameters a (vegetative growth rate), {Phi} (flowering ratio), P1 (pre-flower induction period) and P4 (flower production period) in diluted media were similar to those in 1/2 H1S medium. However, P2 (flower induction period) was greatly extended by the dilution of the medium up to 1/10 strength and was gradually shortened by further dilution up to 1/80 strength.

P1 and P2 in 1/4 H1S medium were extended by 1.0 and 2.5 days, respectively, by the interruption of the dark period with 5-min red light at the 7th h. However, the extension of P1 and P2 due to dark period interruption was not observed in more diluted H1S medium.

It is suggested that certain ions in H1S medium are affecting the timing mechanism of flower induction in L. paucicostata 6746.

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