Which limitation arises when stomata close during CAM photosynthesis under high temperatures?

💡 Explanation

When plants using CAM photosynthesis close their stomata during high temperatures, reduced transpiration occurs because dehydration would happen without that control, limiting available carbon dioxide required for the enzyme phosphoenolpyruvate carboxylase during nocturnal carbon fixation. Therefore reduced carbon dioxide uptake is the only possible outcome, rather than daytime photorespiration, malic acid reduction, or elevated oxygen which are countered using different CAM adaptations.

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