why does high temperature inhibit photosynthetic action
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The Rubisco oxygenase side reaction promotes the production of H2O2, which can be toxic to plant cells. Transitory or constant high temperature causes morphological, physiological, and biochemical changes that reduce photosynthesis and thus limit plant growth and productivity
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At high temperatures (20°-40°C). The rate of photosynthesis decreases because the enzymes do not work as efficiently at this temperature. This is despite the increase of carbon dioxide diffusion into leaves. ... Above the optimum temperature the rate begins to decrease, as enzymes are denatured, until it stops.
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