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Position: Home > Articles > Natural variation of an autophagy-family gene among rice subspecies affects grain size and weight The Crop Journal 2024,12 (1)

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;Qiqun Cheng;Hui Wang;Qing Zhong;Zhihao Chen;Liping Chen;Haohua He;Jianmin Bia

单位：

Weill Cornell Medical College, Immunology and Microbiology Department, New York, NY 10065, USA;Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education. Jiangxi Agricultural University, Nanchang 330045, Jiangxi, China;Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education. Jiangxi Agricultural University, Nanchang 330045, Jiangxi, Chin

关键词：

Grain size;GW3a;Autophagy;Starch conten

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.

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

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