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《Journal of Nuclear Agricultural Sciences》 2018-02
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Starch Degradation and Analysis of Key-gene Expression During Postharvest Kiwifruit Softening

CHEN Jingdan;XU Feng;CHEN Wei;YANG Zhenfeng;College of Biological and Environmental Sciences,Zhejiang Wanli University;School of Marine Sciences,Ningbo University;  
In order to explore the relationship between postharvest fruit softening and starch degradation,the effect of exogenous ethylene and 1-methylcyclopropene( 1-MCP) treatments on starch degradation in ‘Hongyang'kiwifruit were investigated. Results showed that,firmness and starch content in postharvest kiwifruit decreased during storage.Exogenous ethylene treatment promoted softening and starch degradation,while exogenous 1-MCP treatment could maintain higher firmness and starch content. The expression of Ac AMY1,Ac AMY3,Ac BAM1,and Ac ABAM3 were significantly up-regulated by ethylene treatment and inhibited by 1-MCP treatment during storage. Meanwhile,exogenous 1-MCP treatment also inhibited the expression of Ac LDA1,and maintained higher transcription levels of Ac PWD and Ac ISA3 during storage. These results suggest that there is a positive correlation between kiwifruit softening and starch degradation during storage. Ethylene treatment inhibited the expression of Ac PWD,which may accelerate starch phosphorylation and finally promoted in starch degradation and fruit softening. 1-MCP treatment could inhibit the glucan de-branching,which could efficiently delay starch degradation and alleviate kiwifruit softening during storage.These results provided a theoretical basis for revealing relationship between the mechanism of starch degradation and the process of softening in kiwifruit.
【Fund】: 国家自然科学基金项目(31371866);; 浙江省重中之重学科学生创新项目(CX2016001);; 农业部果品产后处理重点实验室开放课题(GPCH201704)
【CateGory Index】: S663.4
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