ISHS Acta Horticulturae 682: V International Postharvest Symposium
CHANGES IN GLUTAMINE SYNTHETASE ACTIVITY AND AMMONIA CONTENT DURING STORAGE OF VEGETABLE SOYBEAN |
| Authors: | T. Matsui, Y. Kosugi, K. Kawada |
| Keywords: | amino acid, ammonia, indicator, Glycine max Merr., glutamine synthetase, respiration, soybean |
| Abstract:
Vegetable soybean (Glycine max Merr. ‘Iwatemidori’) quality deteriorates rapidly after harvest and is associated with an increase in the ammonia content and a decrease in the amino acid content of the seed. In other plant systems it is known that ammonia buildup is toxic and causes tissue deterioration. Glutamine synthetase (GS; EC 6.3.1.2) has a central role in plant nitrogen metabolism and constitutes a key enzyme in the assimilation of ammonia. Towards controlling the loss of amino acid and consequently improving the postharvest life, respiration rate, total amino acid and ammonia content and, the activity of GS in harvested vegetable soybean were examined. Vegetable soybean seeds were stored at 5 and 20°C up to 10 days. Ammonia content of soybean is used as an indicator of the freshness as considered in other vegetables like broccoli and asparagus during storage. | |
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