Changes in Activities of Glutamine Synthetase during Grain Filling and Their Relation to Rice Quality

Abstract

Abstract: Four japonica rice varieties differed in cooking and eating qualities were used in a pot experiment to study the relationship between the activities of glutamine synthetase during grain filling and rice quality. The activities of glutamine synthetase gradually increased and then declined as a single peak curve in the course of grain filling. The 15th day after heading was a turning point, before which the enzymatic activities in the inferior rice varieties with high protein content were higher than those in the superior rice varietie with low protein content, and after which it was converse. The activity of glutamine synthetase in grain was correlated with the taste meter value, peak viscosity and breakdown negatively at the early stage of grain filling whereas positively at the middle and late stages. Moreover, it was correlated with the protein content of rice grain and setback positively at the early stage and negatively at the middle and late stages. The correlation degree varied with the course of grain filling. From 15 days to 20 days after heading was a critical stage, in which the direction of correlation between the activity of glutamine synthetase and taste meter value and RVA properties of rice changed.

Key words: japonica rice, grain filling, glutamine synthetase, enzyme activity, nitrogen content, protein content, cooking and eating quality

JIN Zheng-xun, QIAN Chun-rong, YANG Jing, LIU Hai-ying, PIAO Zhong-ze . Changes in Activities of Glutamine Synthetase during Grain Filling and Their Relation to Rice Quality[J]. RICE SCIENCE, 2007, 14(3): 211-214 .

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