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Plant and Cell Physiology, 1973, Vol. 14, No. 6 1133-1141
© 1973

Article

Effects of some SH-inhibitors and EDTA on flowering in Lemna perpusilla 6746

Atsushi Takimoto and Osamu Tanaka

Laboratory of Applied Botany, Faculty of Agriculture, Kyoto University Kyoto, Japan

Lemna perpusilla 6746, a short-day duckweed, flowered under continuous illumination on M-sucrose medium containing CuSO4, AgNO3 and HgCl2, which are SH-inhibitors. The optimum concentrations of CuSO4, AgNO3 and HgCl2 were 5, 1 and 20 µM, respectively. Other metal ions tested were ineffective, but at least two other SHinhibitors, potassium ferricyanide and iodoacetamide, also induced long-day flowering at the concentrations of 0.1-1 µM.

Adding 50 µM EDTA to the medium prevented the effect of cupric ion, but not that of other SH-inhibitors. EDTA at 200 µM induced some long-day flowering when added to a medium with no SH-inhibitors. It also permitted some flowering when added together with cupric ion, and accelerated flowering in the presence of the other SHinhibitors listed above. EDTA and SH-inhibitor effects appeared to be additive.

(Received May 25, 1973; )
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W. S. Hillman
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