Effect of far‐red light on malate and potassium contents in cotton leaves: Relation to drought resistance

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Abstract
Long‐ or short‐term far‐red light given before a dark treatment modified the water status and the potassium and malate contents in cotton (Gossypium hirsutum L. cv. Bou) leaves. Upon a long‐term treatment, the leaf water content and the leaf water and osmotic potentials were lower whereas stomatal resistance was greater with a decrease in daily transpiration. There was a parallel increase in potassium and malate, but the calcium content was not significantly changed. This resulted in better water economy with an increase in drought resistance. Upon a short‐term treatment, the accumulation of potassium and malate was reversible and the drought resistance was modified accordingly. There was a positive correlation between the ability of a plant to resist water stress and the content of potassium and malate.