Which process limits CO2 intake affecting photosynthetic rate during high temperature stress in plants?

💡 Explanation

During high temperature stress, increased abscisic acid triggers stomatal closure, which limits CO2 intake needed for the Calvin cycle because of reduced water loss through transpiration. Therefore, stomatal closure occurs, rather than chloroplast damage or rubisco/thylakoid degradation, which occur through independent heat stress mechanisms without immediate stomatal action.

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