Responses of Avena and Pisum Tissues to Phytochrome Conversion by Red Light

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Abstract
For an initial brief illumination to saturate the subsequent growth response in excised segments of either etiolated Pisum stems or Avena coleoptiles, it muct convert a substantial proportion of the phytochrome of Pfr. In both these materials, the results of experiments conducted with photostationary state illuminations are consistent with those ob-tained with various dosages of pure red. There is no evidence in either tissue for maximal or near-maximal effects of dosages too low to give spectrophotometrically detectable phytochiome conversions.