Abstract

Imbibition of radiation-requiring seeds of lettuce in thiol group reagents delays the start of germination and reduces the final germination percentage. Photocontrol of the induced germination by brief far-red irradiation is retained in reagent-imbibed seeds for a longer time than in water-imbibed seeds. The delay in germination is attributed to a slowing of the action of the far-red-absorbing form of phytochrome, or to interference with some other process which occurs concurrently.

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