Ion Fluxes and Phytochrome Protons in Mung Bean Hypocotyl Segments: II. Fluxes of Chloride, Protons, and Orthophosphate in Apical and Subhook Segments 1
AUTOR(ES)
Brownlee, Colin
RESUMO
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.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=543056Documentos Relacionados
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