Vacuolar pH oscillations in mesophyll cells accompany oscillations of photosynthesis in leaves: Interdependence of cellular compartments, and regulation of electron flow in photosynthesis
✍ Scribed by Katharina Siebke; Zu-Hua Yin; Agepati S. Raghavendra; Ulrich Heber
- Publisher
- Springer-Verlag
- Year
- 1992
- Tongue
- English
- Weight
- 569 KB
- Volume
- 186
- Category
- Article
- ISSN
- 0032-0935
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✦ Synopsis
Oscillations of photosynthesis induced in leaves of Vicia faba L. were accompanied by oscillations not only in the pH of the chloroplast stroma, but also by pH oscillations in the cytosol and in the vacuole of leaf mesophyll cells. Cytosolic pH oscillations were in phase with stromal oscillations, but antiparallel to vacuolar pH oscillations. During maxima of photosynthesis, the cytosolic pH exhibited maxima and the vacuolar pH minima. Vacuolar acidification is interpreted to be the result of energized proton transport from the cytosol into the vacuole. Since the ratio of dihydroxyacetone phosphate to phosphoglycerate is maximal during the peaks of photosynthesis (