Phenotype of Rice Floury Endosperm Mutant flo7 and Fine Mapping of Mutated Gene

作     者：SHENG Zhong-hua FANG Peng-fei LI San-feng JIAO Gui-ai XIE Li-hong HU Pei-song TANG Shao-qing WEI Xiang-jin 

作者机构：State Key Laboratory of Rice Biology/Key Laboratory of Rice Biology and Genetic Breeding of Ministry of AgricultureChina National Rice Research Institute 

出 版 物：《Rice science》 (水稻科学（英文版）)

年 卷 期：2015年第22卷第4期

页      面：162-170页

核心收录：

学科分类：09[农学] 0901[农学-作物学] 

基　　金：supported by China National Natural Science Foundation (Grant Nos. 31471472 and 31301303) Natural Science Foundation of Zhejiang Province,China (Grant Nos. LY13C130003 and LY14C130012) 

主　　题：flo7 floury endosperm starch fine mapping rice mutant 

摘      要：The major storage substance in rice endosperm is starch, which accounts for 80% of dry matter weight. In this study, rice mutant flo7, selected from the progeny of Nipponbare＇s tissue culture, displayed floury and opaque endosperm. Compared with its corresponding wild type （WT） Nipponbare, the mutant rio7 produced longer, narrower, thinner and lighter grains. The levels of glucose, fructose and sucrose in the mutant flo7 endosperm were higher than those in the WT endosperm, whereas the protein content was not affected. With respect to both amylose content and gel consistency, the mutant flo7 was lower than WT, but its alkali value was higher. Scanning electron microscopic examinations showed that the endosperm of the mutant flo7 contained irregular, loosely packed and compound starch granules. Genetic analysis indicated that the mutant phenotype was determined by a single recessive nuclear gene The flo7 locus was mapped to a region on the long arm of chromosome 12, within a 95.1 kb interval defined by the markers C2-11 and C5-15. There are 13 open reading frames in the mapping interval. Transcription profiling of the developing grains showed that a number of genes involved in starch synthesis were affected differently in the mutant flo7.