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Analysis of resistant starch degradation in postharvest ripening of two banana cultivars: Focus on starch structure and amylases

文献类型： 外文期刊

作者： Gao, Huijun 1 ; Huang, Shaobo 1 ; Dong, Tao 1 ; Yang, Qiaosong 1 ; Yi, Ganjun 1 ;

作者机构： 1.Guangdong Acad Agr Sci, Inst Fruit Tree Res, Guangzhou 510640, Guangdong, Peoples R China

关键词： Starch;Cavendish and Plantain;Gene expression;Resistant starch;Scanning electron microscopy

期刊名称：POSTHARVEST BIOLOGY AND TECHNOLOGY （ 影响因子：5.537； 五年影响因子：5.821 ）

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收录情况： SCI

摘要： Bananas are well known as good sources of dietary energy, with high levels of sugar and starch. To further analyze the starch-degradation mechanism in bananas, two species, Cavendish and Plantain, were used to investigate the influences of hydrolases and granule structure on starch degradation. Determination of the levels of resistant starch (RS), non-resistant starch (non-RS), total starch, and amylose content showed that each starch component content decreased gradually during the fruit-ripening process in both Cavendish and Plantain. Compared to Cavendish, Plantain had a higher content of total starch and RS, a faster starch-degradation rate, and a lower decrease in the ratio of RS/total starch. Scanning electron microscopy (SEM) images revealed that the starch granules of Cavendish were larger and more rounded than the smaller and ellipsoidal starch granules found in Plantain. Also, the analysis of gene expression suggested that beta-amylases make a central contribution to starch degradation in both species and highly up-regulated beta-amylases were correlated with the faster starch-degradation rate in Plantain. Two alpha-amylases, one starch phosphorylase, and one starch debranching enzyme were specifically upregulated in Plantain, which might hydrolyse more non-RS compared with Cavendish. (C) 2016 Published by Elsevier B.V.

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