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Effect of light and temperature on the germination of lettuce seeds
1Departamento de Bioquímica, Universidade Federal de Permambuco, 50. 000, Recife, PE, Brasil.
Abstract:
A short period (15-30 min) at 30° C promotes germination of seeds of Lactuca sativa L. cv. Repolhuda in darkness. Far-red light reverses this stimulation, and the escape curves for phytochrome and high-temperature action are quite similar, indicating that the two factors act at a common point in the chain of events leading to germination. It is suggested that high temperature acts by decreasing the threshold of the active, far-red absorbing, form of phytochrome (Pfr) needed to promote germination.
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