Journal archive > 2008 > N 1 January-February  

INFLUENCE OF SALTS OF HEAVY METALS ON ACTIVITY OF KEY ENZYMES
OF GLYOXYLATE CYCLE AND CONTENT OF MALONDIALDEHYDE PRODUCTS
IN THE SEED LOBE OF GERMINATING SOYBEAN SEEDS

H. F. Bezdudna, P. A. Kaliman

Karazin Kharkov National University, Ukraine;
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The influence of CoCl2 and CdCl2 on the activity of isocytrate lyase, malate synthase and NAD-malate dehydrogenase in the seed lobes and the composition of malondialdehyde products at early stages of germinating of soybean seeds: after first 24-hours, 72 hours and 96 hours are investigated. It is shown that when germinating in the medium containing no metal salts, isocytrate lyase activity is greatly increased during 96 h and malate synthase is increased after 72 h and is decreased after 96?h of germination period. CoCl2 activated isocytrate lyase activity after 72 hours and decreased malate synthase activity after 96 hours. The lengthe­ning of the primary root under such conditions is noted. CdCl2 inhibited isocytrate lyase activity during first 24 hours and suppressed malate synthase activity after 96 hours. During this process the germ growth is suppressed. CoCl2 increased the composition of malondialdehyde products during each period of germination, and CdCl2 increased malondialdehyde content after 72 and 96 hours. The role of glyoxylate cycle enzymes in transforming­ fatty acids into carbohydrates and in forming the primary root under the process of germination of seed lobes of soybean is discussed.

Key words: isocytrate lyase, malate synthase, malate dehydrogenase, malondialdehyde products, soybean seed lobes, cadmium chloride, cobalt chloride.

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