The green and bleached portions within seed lots were separated and compared to minimize differences that might be due to genotype and production environment. In the laboratory, the seeds were further sorted by eye on an opal plastic plate over a fluorescent lamp, sized, and stored in sealed cans at -120 until used.
Abstract.-Evidence is advanced for a network of three photoreactions and five dark reactions in control of plant growth and development by phytochrome.Introduction.-Plant responses potentiated by the photoreversible change of phytochrome (P) are often negated or modified by irradiation for a long time in the 680-760 nm region.' These responses to energies much higher than are required for reversible change of P are grouped under HER as an acronym. Various explanations of the HER have been advanced, but none is without question. Attempts by us and others to involve light absorption in the HER by pigments other than P have, generally led back to P. The most satisfactory model for the HER is that of Hartmann.2 It is shown in Figure 1, where X is
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