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Lactic acid content and production, as well as lactic dehydrogenaseactivity were studied in pea root tips grown in media salinatedwith NaCl or Na2SO4. Salinity of both types depressed the lacticacid content of the tissue. Lactic dehydrogenase activity linkedto NADH was depressed by high concentrations of NaCl in thegrowth medium, but was stimulated by increasing concentrationsof Na2SO4. There was a trace of NADPH linked activity of theenzyme; this activity was not affected by chloride salinitybut was depressed by sulphate salinity. It is not yet clearhow these events are connected with the overall effect of salinityon the carbohydrate metabolism of pea root tips. (Received June 27, 1970; ) 相似文献
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