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This study aims to determine how stromal acidification influences the inhibition of photosynthesis under osmotic dehydration in vivo.

August 1, 1983PLANT PHYSIOLOGYOpen Access

Stromal Acidification Mediates In Vivo Water Stress Inhibition of Nonstomatal-Controlled Photosynthesis

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Randomized trial investigates how stromal acidification affects photosynthesis under water stress in plants, suggesting a reversal strategy.

This study aims to determine how stromal acidification influences the inhibition of photosynthesis under osmotic dehydration in vivo.
Investigated effects of NH(4)Cl on CO(2) fixation in vacuum-infiltrated spinach leaf slices, Chlamydomonas reinhardii, and Aphanocapsa 6308 cells under stress and isotonic conditions.
Measured CO(2) fixation rates under varying osmotic potentials with different concentrations of mannitol and sorbitol.
Five millimolar NH(4)Cl increased CO(2) fixation in spinach leaf slices by 43% under stress conditions (0.67 molar sorbitol).
Chlamydomonas reinhardii showed CO(2) fixation rates of 99 micromoles/mg chlorophyll at 0.1 molar mannitol, and 17 micromoles/mg at 0.28 molar mannitol, with a 147% increase from NH(4)Cl under stress conditions.
Photosynthesis inhibitions in Aphanocapsa 6308 were also partially reversed by NH(4)Cl.

Berkowitz et al. (1983) studied this question.

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Randomized trial investigates how stromal acidification affects photosynthesis under water stress in plants, suggesting a reversal strategy.