Which consequence results when a C4 plant's mesophyll cells are damaged, impairing PEP carboxylase function?

💡 Explanation

When mesophyll cells are damaged, PEP carboxylase impairment blocks initial CO2 fixation because this enzyme no longer efficiently captures CO2, funneling directly to the bundle sheath cells. Therefore, increased photorespiration results, rather than increased efficiency, water control or salinity tolerance which require functional C4 pathways and distinct biochemical mechanisms.

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