File(s) under permanent embargo
Critical roles of soluble starch synthase SSIIIa and granule-bound starch synthase Waxy in synthesizing resistant starch in rice
journal contribution
posted on 2023-05-19, 00:14 authored by Zhou, H, Wang, L, Liu, G, Meng, X, Jing, Y, Shu, X, Kong, X, Sun, J, Yu, H, Steven SmithSteven Smith, Wu, D, Li, JChanges 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–lipid 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.
History
Publication title
Proceedings of the National Academy of Sciences of The United States of AmericaVolume
113Issue
45Pagination
12844-12849ISSN
0027-8424Department/School
School of Natural SciencesPublisher
Natl Acad SciencesPlace of publication
2101 Constitution Ave Nw, Washington, USA, Dc, 20418Rights statement
Copyright 2016 PNASRepository Status
- Restricted