Natural variation of an autophagy-family gene among rice subspecies affects grain size and weight  

作　　者：Shiying Huang Peng Wang Caijing Li Qingwen Zhou Tao Huang Yicong Cai Qin Cheng Hui Wang Qi Zhong Zhihao Chen Liping Chen Haohua He Jianmin Bian 

机构地区：[1]Key Laboratory of Crop Physiology,Ecology and Genetic Breeding,Ministry of Education.Jiangxi Agricultural University,Nanchang 330045,Jiangxi,China [2]Weill Cornell Medical,Immunology and Microbiology,1300 York Avenue,Box 62,New York,NY 10065,USA

出　　处：《The Crop Journal》2024年第1期121-132,共12页作物学报（英文版）

基　　金：This research was supported by the National Natural Science Foundation of China(32160485);Jiangxi Double Thousand Plan(jxsq2023201057);Key R&D Plan of Jiangxi Province(20224BBF62001,20224BBF61030).

摘　　要：Elucidating the genetic basis of natural variation in grain size and weight among rice varieties can help breeders develop high-yielding varieties.We identified a novel gene,GW3a(Grain Weight 3a)(LOC_Os03g27350),that affects rice grain size and weight.gw3a mutants showed higher total starch content and dry matter accumulation than the wild type(WT),Nipponbare,suggesting that GW3a negatively regulates grain size and weight.Moreover,our study found that GW3a interacted with OsATG8 by cleaving it,suggesting that GW3a may be involved in the assembly of autophagosomes and starch degradation in plants.The haplotype analysis of GW3a showed functional differences between indica and japonica rice.Taken together,we conclude that GW3a is expressed in the autophagosome pathway regulating starch metabolism in rice,affecting yield-related traits,such as grain size,grain weight and thousand grain weight(TGW).Our findings also shed new light on autophagy-mediated yield trait regulation,proposing a possible strategy for the genetic improvement of high-yield germplasm in rice.

关 键 词：Grain size GW3a AUTOPHAGY Starch content 

分 类 号：S511[农业科学—作物学]