Changes in Soluble Sugar Content and Antioxidant Enzymes in Soybean Seeds under Different Storage Conditions

摘要

Soybean seeds stored in polythene and jute bags at different temperatures viz., 15°C, 32°C and room temperature (RT) for a period of 180 days were studied for soluble sugars content, lipid peroxidation and activities of antioxidant enzymes, and related this information with the germination and seed viability. Under different storage conditions, the germination of soybean seeds was maximum soon after harvest as compared to different periods of storage (DoS). Contents of total soluble sugars and sucrose were higher after harvest and decreased during 45 days of storage. Total soluble sugars increased from 45 to 180 DoS irrespective of storage conditions. Sucrose content increased from 45 to 90 DoS and then decreased till 180 days in seeds stored in jute bags at 15°C and 32°C with little change in other storage conditions. The content of reducing sugars increased during 45 days and then decreased, however the reducing sugars decreased steadily in jute bags stored at 15°C and 32°C. The levels of malonaldehyde increased in the seeds stored in both the packaging from 45 to 180 DoS at all the three temperatures. The increase in the levels of lipid peroxidation in seeds during storage was associated with the decreased activities of antioxidant enzymes like catalase and peroxidase.