Plant Physiol.
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Plant Physiology 64:211-213 (1979)
© 1979 American Society of Plant Biologists

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Articles

Ion Fluxes and Phytochrome Protons in Mung Bean Hypocotyl Segments

II. Fluxes of Chloride, Protons, and Orthophosphate in Apical and Subhook Segments 1

Colin Brownlee2 and Richard E. Kendrick

a Department of Plant Biology, The University, Newcastle upon Tyne, NE1 7RU, United Kingdom

The active form of phytochrome (Pfr) decreased CI– uptake by subhypocotyl hook segments of Phaseolus aureus Roxb. and increased uptake by apical segments. Pfr had similar effects on Pi [32Pi] uptake. Modulations of Pi [32Pi] uptake were detectable 10 minutes following photoconversion. Pfr may modulate Pi influx across the plasmalemma. Pfr inhibited H+ extrusion by subhook segments and enhanced extrusion by apical hook segments. No rapid effects on H+ extrusion were found. Phytochrome may regulate a K+ -H+ exchange process. The differential responses of the two regions of the hypocotyl are discussed with respect to Pfr-mediated changes in growth and development.

2 Present address: Botany Department, The University, P.O. Box 147, Liverpool, L69 3BX, United Kingdom; to whom requests for reprints and information should be addressed.

1 Supported by an S.R.C. Studentship to C. B. and by a Royal Society Scientific Investigations Grant to R. E. K.






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ASPB Publications PLANT PHYSIOLOGY THE PLANT CELL
Copyright © 1979 by the American Society of Plant Biologists