Effect of various salts on the synthesis of ascorbic acid and carotene in cress seedlings

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Abstract
Measured in various salt solns., the synthesis of ascorbic acid (I) and of carotene (II) by cress seedlings was decreased in (NH4)2SO4, NH4C1, (NH4)2 HP04, but not affected by NH4HCO3, NH4NO3, ammonium acetate and ammonium succinate. I was increased by Na . and K salts of nitric, carbonic, acetic, succinic, malic, aspartic acids, although the free succinic, malic or aspartic acids had little effect. The depressing effect of (NH4)2SO4 was diminished by the Na salts of succinic, malic or aspartic acids, but not by the free acids. The synthesis of xantho-phyll was not diminished by (NH4)2SO4. There was a positive correlation between the pH of the expressed cell sap and the amt. of I synthesized. The factor determining the extent of synthesis of I is probably the amt. of base available to the plant after metabolic change.

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