Moderate Salinity Stress Affects Rice Quality by Influencing Expression of Amylose- and Protein-Content-Associated Genes

Author:

Zheng Chongke1,Niu Shulin1,Yan Ying2,Zhou Guanhua1,Peng Yongbin1,He Yanan1,Zhou Jinjun3,Li Yaping1,Xie Xianzhi1

Affiliation:

1. Institute of Wetland Agriculture and Ecology, Shandong Rice Engineering Technology Research Center, Shandong Academy of Agricultural Sciences, Jinan 250100, China

2. Crop Breeding and Cultivation Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China

3. Institute of Crop Germplasm Resources, Shandong Academy of Agricultural Sciences, Jinan 250100, China

Abstract

Salinity is an environmental stress that severely impacts rice grain yield and quality. However, limited information is available on the molecular mechanism by which salinity reduces grain quality. In this study, we investigated the milling, appearance, eating and cooking, and nutritional quality among three japonica rice cultivars grown either under moderate salinity with an electrical conductivity of 4 dS/m or under non-saline conditions in a paddy field in Dongying, Shandong, China. Moderate salinity affected rice appearance quality predominantly by increasing chalkiness rate and chalkiness degree and affected rice eating and cooking and nutritional quality predominantly by decreasing amylose content and increasing protein content. We compared the expression levels of genes determining grain chalkiness, amylose content, and protein content in developing seeds (0, 5, 10, 15, and 20 days after flowering) of plants grown under saline or non-saline conditions. The chalkiness-related gene Chalk5 was up-regulated and WHITE-CORE RATE 1 was repressed. The genes Nuclear factor Y and Wx, which determine amylose content, were downregulated, while protein-content-associated genes OsAAP6 and OsGluA2 were upregulated by salinity in the developing seeds. These findings suggest some target genes that may be utilized to improve the grain quality under salinity stress conditions via gene-pyramiding breeding approaches.

Funder

National Key R&D Program of China

Key R&D Program of Shandong Province, China

Leading talents in the Yellow River Delta industry

Publisher

MDPI AG

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