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Journal of Integrative Agriculture  2015, Vol. 14 Issue (4): 642-659    DOI: 10.1016/S2095-3119(14)60782-6
Physiology·Biochemistry·Cultivation·Tillage Advanced Online Publication | Current Issue | Archive | Adv Search |
Effect of high temperature on the expressions of genes encoding starch synthesis enzymes in developing rice endosperms
 CAO Zhen-zhen, PAN Gang, WANG Fu-biao, WEI Ke-su, LI Zhao-wei, SHI Chun-hai, GENG Wei, CHENG Fang-min
College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, P.R.China
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摘要  High temperature is the major environmental factor affecting grain starch properties of cooking rice cultivars. In this study, two non-waxy indica rice genotypes, cv. 9311 and its mutant with extremely high amylose phenotype (9311eha) were used to study the differential expressions of genes in starch synthesis and their responses to high temperature (HT). Significant increase in apparent amylose content and hot-water-soluble starch content in mutant 9311eha were genetically caused by a substitution from AGTTATA to AGGTATA at the leader intron 5´ splice site in Wx gene. This mutation resulted in different mRNA transcript levels, mRNA splicing efficiencies and protein levels of Wx between the two rice genotypes, which also lead to the genotype-dependent alteration in the temporal pattern of Wx transcription and granule-bound starch synthase (GBSS) activity in response to HT. However, changes in the activities of other starch synthesizing enzymes and their expressions of distinct isoform genes were not significant with the Wx gene mutation, thus only minor difference in the particle size of starch granule, chain-length distribution and gelatinization enthalpy were found between the two genotypes. The temporal- specific expression of multiple isoform genes responsive to different temperature regiments indicated that the reduction of GBSS transcript expression under HT was generally accompanied by the decreased expressions of SSSIIa, SSSIIIa and SBEIIb. Consequently, high temperature-ripened grains in 9311eha showed high proportion of intermediate and long B chains and somewhat lower level of short A chain compared to the wildtype. The temperature-dependent alteration of amylose content was not only attributed to the reduced expression of GBSS, but also associated with the complimentary effect of SSSIIa and SBEIIb.

Abstract  High temperature is the major environmental factor affecting grain starch properties of cooking rice cultivars. In this study, two non-waxy indica rice genotypes, cv. 9311 and its mutant with extremely high amylose phenotype (9311eha) were used to study the differential expressions of genes in starch synthesis and their responses to high temperature (HT). Significant increase in apparent amylose content and hot-water-soluble starch content in mutant 9311eha were genetically caused by a substitution from AGTTATA to AGGTATA at the leader intron 5´ splice site in Wx gene. This mutation resulted in different mRNA transcript levels, mRNA splicing efficiencies and protein levels of Wx between the two rice genotypes, which also lead to the genotype-dependent alteration in the temporal pattern of Wx transcription and granule-bound starch synthase (GBSS) activity in response to HT. However, changes in the activities of other starch synthesizing enzymes and their expressions of distinct isoform genes were not significant with the Wx gene mutation, thus only minor difference in the particle size of starch granule, chain-length distribution and gelatinization enthalpy were found between the two genotypes. The temporal- specific expression of multiple isoform genes responsive to different temperature regiments indicated that the reduction of GBSS transcript expression under HT was generally accompanied by the decreased expressions of SSSIIa, SSSIIIa and SBEIIb. Consequently, high temperature-ripened grains in 9311eha showed high proportion of intermediate and long B chains and somewhat lower level of short A chain compared to the wildtype. The temperature-dependent alteration of amylose content was not only attributed to the reduced expression of GBSS, but also associated with the complimentary effect of SSSIIa and SBEIIb.
Keywords:  rice       starch synthesis       gene expression       amylopectin strucrute       high temperature  
Received: 13 March 2013   Accepted:
Fund: 

the National Natural Science Foundation of China (31071366 and 31271655) for its financial support to this research project.

Corresponding Authors:  CHENG Fang-min, Tel: +86-571-86940446,E-mail: chengfm@zju.edu.cn     E-mail:  chengfm@zju.edu.cn
About author:  * These authors contributed equally to this study.

Cite this article: 

CAO Zhen-zhen, PAN Gang, WANG Fu-biao, WEI Ke-su, LI Zhao-wei, SHI Chun-hai, GENG Wei, CHENG Fang-min. 2015. Effect of high temperature on the expressions of genes encoding starch synthesis enzymes in developing rice endosperms. Journal of Integrative Agriculture, 14(4): 642-659.

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