Plant Physiol.
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Plant Physiology 65:1058-1061 (1980)
© 1980 American Society of Plant Biologists

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Comparison of the Ability of Salicylic Acid and Ferricyanide to Induce Flowering in the Long-day Plant, Lemna Gibba G3

Osamu Tanaka1 and Charles F. Cleland

Smithsonian Institution, Radiation Biology Laboratory, 12441 Parklawn Drive, Rockville, Maryland 20852

Both salicylic acid and ferricyanide induce flowering in the long-day plant Lemna gibba L., strain G3 under 8- and 9-hour short days. In both cases the effect is daylength-dependent. Salicylic acid is ineffective on daylengths less than 8 hours and ferricyanide is ineffective on daylengths less than 5 hours. When both substances are given together a striking synergistic interaction is observed, and some flowering is obtained on daylengths as short as 3 hours. However, even with the optimal combinations the flower-inducing effect remains daylength-dependent.

Flowering of L. gibba G3 is inhibited under continuous light in both half-strength Hutner's medium (0.5 H), which contains 1.25 millimolar ammonium, and in ammonium-free half-strength Hutner's medium (NH4+-free 0.5 H). Salicylic acid is able to reverse the inhibition substantially in 0.5 H medium and to cause complete reversal in NH4+-free 0.5 H medium. By contrast, ferricyanide has no effect in 0.5 H medium and causes only a small reversal in NH4+-free 0.5 H medium. Flowering of L. gibba G3 is also inhibited under continuous light by copper. This inhibition is largely reversed by salicylic acid but ferricyanide has no effect.

1 Present address: Laboratory of Applied Botany, Faculty of Agriculture, Kyoto University, Kyoto 606, Japan.






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Copyright © 1980 by the American Society of Plant Biologists