Effect of Salt Stress on Starch Formation and Yield of Japonica Rice in Cold-region

doi:10.7668/hbnxb.201751052

Abstract

Abstract: In order to investigate the effect of salt stress on starch synthesis and accumulation of Japonica rice in cold-region and enrich the physiological basis of salt tolerance research.The paper used pot experiment to study the influence of different concentrations of salt stress on the key enzymes activities related to starch of Japonica rice in cold-region and the relationships between the changes rule in key enzymes activities and starch content, revealed the response mechanism of Japonica rice in cold-region kernel starch anabolism under salt stress,studied the effect of yield and yield components of Japonica rice in cold-region under salt stress, as well as the effect of yield formation mechanism of Japonica rice in cold-region under salt stress. The results showed that compared with the control, the activities of soluble starch synthase (SSS),ADPG pyrophosphorylase and starch branching enzyme(Q enzyme) in grain of Japonica rice in cold-region decreased under salt stress, and the contents of total starch and amylopectin in grain decreased, while the amylose content in grain increased. Meanwhile,with the increased of salt concentration, the indicators of yield components gradually declined, salt stress mainly affected the grain number per panicle and seed setting rate of MDJ30 and thus affected the yield, while LD5 was the effective panicle number and seed setting rate. When soil salt content was more than 0.075%, the theoretical yield was greatly affected. In terms of variety, compared with MDJ30, the salt-tolerance variety LD5 had relatively high starch synthase activity, which results in a higher content of starch and its components.This was beneficial to grain dry matter accumulation and ensure that its yield could still be maintained at relatively high levels under salt stress. Thus, the key enzyme activite of starch synthesis in kernel is different product of different salt-tolerant varieties responding to salt stress, the change rule and the level of its activity can be used as an indicator for salt tolerance identification.

Key words: Japonica rice in cold-region, Salt stress, Starch, Yield

CLC Number:

S511.01

HU Bowen, GU Jiaojiao, JIA Yan, SHA Hanjing, ZHANG Junyan, HUANG Shuqin, ZHAO Hongwei. Effect of Salt Stress on Starch Formation and Yield of Japonica Rice in Cold-region[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2019, 34(1): 115-123. doi: 10.7668/hbnxb.201751052.

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