Phytochrome Action in Tomato-Seed Germination

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Abstract
Dark-germinating seeds of Ace and Porte tomato varieties can be inhibited by far-red radiation. Germination of inhibited seed is promoted by red radiation and in turn is reversed by far-red radiation, indicative of control by phytochrome. In the Ace variety initial inhibition requires only a single short far-red exposure. Prolonged far-red irradiation extending over many hours is required for inhibition of Porte seeds. The prolonged exposure can be replaced by cyclical far-red irradiation for 3.3% of the total time. This effect is considered as arising in part from conversion of Pfr to Pr as phytochrome appears in the seed by rehydration. Effects are also evident of exhaustion of endogenous factors other than P fr needed for germination when P fr is maintained at a low level.

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