Phytochrome-induced Increase of Fluorescein Translocation in Mung Bean Hypocotyls.
Moderate doses of red (660 nanometer) irradiation cause a rapid increase in the translocation of fluorescein in dark-grown mung bean hypocotyl (Vigna radiata L.) segments. The increase fails to appear following large doses of red (660 nanometers) irradiation. The red induced increase is prevented by a subsequent far red (730 nanometer) irradiation. Reversibility suggests the participation of phytochrome in the process. The increase in translocation is attributed to the generation of a positive electrostatic charge in the plasma membrane by some action of phytochrome on membrane molecules.
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Light and Plant Growth Laboratory, Plant Physiology Institute, Federal Research, SEA, United States Department of Agriculture Beltsville, Maryland 20705.