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Inhibition of Prechill-induced Dark Germination in Sorghum halepense (L.) Pers. Seeds by Phytochrome Transformations

Agricultural Environmental Quality Institute, Agricultural Research Service, United States Department of Agriculture, Beltsville, Maryland 20705

A 10 C dark prechilling of johnsongrass [Sorghum halepense (L.) Pers.] seeds, when terminated by a 2-hr, 40 C temperature shift, potentiates about 40% germination at 20 C in darkness. Irradiation of the seeds before, during, and at the end of prechilling with far red light reduces the subsequent germination, although red irradiation after the far red can overcome some of the inhibition. However, either brief red or far red irradiation given immediately after the temperature shift inhibits subsequent germination by one-third to one-half. The results suggest that the far red-absorbing form of phytochrome is a factor in the prechill-induced dark germination and that phytochrome participates in the inhibition of germination by irradiations immediately after the temperature shift.