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Enhanced Phytochrome Sensitivity and Its Reversal in Amaranthus albus Seeds

Institut National de la Recherche Agronomique, Laboratoire de Malherbologie, BV 1540, 21034 Dijon Cedex, France, United States Department of Agriculture, Agricultural Research Service, Beltsville Agricultural Research Center, Weed Science Laboratory, Beltsville, Maryland 20705

Seed of Amaranthus alus L. develop an enhanced sensitivity to the farred absorbing form of phytochrome after prolonged imbibition at temperatures >32°C. The enhanced sensitivity developed at 40°C could be reversed by subsequent treatment at 20°C and similarly reestablished by repeating a 40°C treatment. It is concluded that relative sensitivity to the far-red absorbing form of phytochrome may be readily manipulated in seeds of A. albus.