Ion Fluxes and Phytochrome Protons in Mung Bean Hypocotyl Segments: II. Fluxes of Chloride, Protons, and Orthophosphate in Apical and Subhook Segments |
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Authors: | Brownlee C Kendrick R E |
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Institution: | Department of Plant Biology, The University, Newcastle upon Tyne, NE1 7RU, United Kingdom. |
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Abstract: | 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. |
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