Which outcome occurs when a rapidly growing C4 plant experiences prolonged magnesium deficiency?

💡 Explanation

When magnesium is deficient, there is reduced synthesis of chlorophyll since it is a key component, limiting energy harvesting due to inhibited chloroplast-based cyclic electron flow in the bundle sheath cells, in C4 plants, therefore decreasing bundle sheath CO2 assimilation. This reduces bundle sheath activity, rather than increased photorespiration, reduced initial fixation, or increased loss, which result from direct effects on the mesophyll or from stomatal malfunction.

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