Effect of Low Nitrogen and Sulfur Supply on Their Accumulation in the Cotton Plant

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Abstract
N. and S. accumulation in the leaves, chloroplast fragments, and bark of cotton plants grown at deficient levels of the 2 elements, were compared with those of plants grown at non-deficient levels of supply. The 2 deficiencies were alike in effecting lower concns. of soluble S, protein N, and protein S, and higher concns. of amino and amide N in the leaves. Chloroplastic protein N and protein S, and also shlorophyll, were reduced by both N and S deficiency. The proportion of the leaf''s protein S in the chloroplasts was lower under N deficiency and higher with S deficiency than in the controls. Under conditions of S deficiency, nitrates and soluble organic N accumulated excessively in the leaves, in contrast to reduced accumulation of soluble sulfate and organic sulfur in the leaves of N-deficient plants. Leaf color of N-deficient plants graded from yellowish-green in the bottom to green in the upper leaves, while the converse characterized S-deficient plants. From data on cotton and many other plants the conclusion is indicated that S of proteolytic origin, in contrast to N, is not readily available for re-use in meristems.
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