PHOTOCONTROL OF PLANT DEVELOPMENT BY THE SIMULTANEOUS EXCITATIONS OF TWO INTERCONVERTIBLE PIGMENTS

Abstract
The pigment in the reversible photo-reaction controlling plant growth and development at low irradiances, is effective at high irradiances in spectral regions where the absorbencies of the oxidized and reduced pigment form are both appreciable. The action with high irradiance depends in part upon the simultaneous absorptions of the 2 forms. This action controls anthocyanin formation and many other responses, including some aspects of photoperiodic induction of flowering and seed germination.

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