The effect of salinity in the growth medium carbohydrate metabolism in pea root tips

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The effect of chloride and sulphate types of salinity on respiratory mechanism of pea roots was studied. Both types of salinity depressed the absorption of external glucose and the rate of respiration and changed the relative part of the metabolic pathways. The percentage of the pentose-phosphate pathway was increased by increasing levels of NaCl salinity while Na_2SO_4 salinity practically did not affect it. Chloride salinity depressed CO_2 evolution from C-6 but did not affect the CO_2 evolution from C-1. Sulphate salinity depressed both. Most of the glycolytic enzymes studied were depressed in roots grown in saline medium except glucose-phosphate isomerase which was not affected by sulphate salinity but was increased more than ten fold by chloride salinity. Phosphogluconate dehydrogenase was not affected by salinity. Glucose-6-phosphate dehydrogenase was found in the mitochondria as well as in the supernatant and both the mitochondrial and the supernatant enzymes were active with NADP and NAD. Salinity of both types increased the NADP linked activity in the soluble fraction. The information gained however is still not sufficient to explain adequately the effect of salinity on plant metabolism.
日本植物生理学会の論文