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Red light initiates many important morphogenetic responses in plants through the mediation of the pigment, phytochrome. How phytochrome promotes photomor-phogenesis is unknown. The evidence that photoactivated phytochrome initiates calcium fluxes in cells is reviewed and how these fluxes could regulate several known red-light induced effects in plants is discussed.
BioScience © 1984 American Institute of Biological Sciences