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Critical roles of soluble starch synthase SSIIIa and granule-bound starch synthase Waxy in synthesizing resistant starch in rice

Citation

Zhou, H and Wang, L and Liu, G and Meng, X and Jing, Y and Shu, X and Kong, X and Sun, J and Yu, H and Smith, SM and Wu, D and Li, J, Critical roles of soluble starch synthase SSIIIa and granule-bound starch synthase Waxy in synthesizing resistant starch in rice, Proceedings of the National Academy of Sciences of The United States of America, 113, (45) pp. 12844-12849. ISSN 0027-8424 (2016) [Refereed Article]

Copyright Statement

Copyright 2016 PNAS

DOI: doi:10.1073/pnas.1615104113

Abstract

Changes in human lifestyle and food consumption have resulted in a large increase in the incidence of type-2 diabetes, obesity, and colon disease, especially in Asia. These conditions are a growing threat to human health, but consumption of foods high in resistant starch (RS) can potentially reduce their incidence. Strategies to increase RS in rice are limited by a lack of knowledge of its molecular basis. Through map-based cloning of a RS locus in indica rice, we have identified a defective soluble starch synthase gene (SSIIIa) responsible for RS production and further showed that RS production is dependent on the high expression of the Waxya (Wxa) allele, which is prevalent in indica varieties. The resulting RS has modified granule structure; high amylose, lipid, and amylose僕ipid complex; and altered physicochemical properties. This discovery provides an opportunity to increase RS content of cooked rice, especially in the indica varieties, which predominates in southern Asia.

Item Details

Item Type:Refereed Article
Keywords:diabetes, resistant starch biosynthesis, soluble starch synthase, granule-bound starch synthase, amylose僕ipid complex
Research Division:Biological Sciences
Research Group:Plant Biology
Research Field:Plant Physiology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Biological Sciences
Author:Smith, SM (Professor Steven Smith)
ID Code:113103
Year Published:2016
Web of Science® Times Cited:6
Deposited By:Plant Science
Deposited On:2016-12-12
Last Modified:2017-09-20
Downloads:0

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