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The GZnC1 variant from common wild rice influences grain Zn content

文献类型： 外文期刊

作者： Hou, Jingjing 1 ; Chen, Hao 2 ; Zhang, Kun 1 ; Liu, Wenjing 5 ; Cao, Caihong 1 ; Ruan, Yini 1 ; Deng, Yanyan 1 ; Liu, Yaxin 1 ; Yuan, Xuzhao 1 ; Sun, Chuanqing 1 ; Fu, Yongcai 1 ;

作者机构： 1.China Agr Univ, Natl Ctr Evaluat Agr Wild Plants Rice, Dept Plant Genet & Breeding,Beijing Key Lab Crop, MOE Key Lab Crop Heterosis & Utilizat, Beijing 100193, Peoples R China

2.Fujian Acad Agr Sci, Inst Crop Sci, Fuzhou 350013, Peoples R China

3.Fujian Engn Res Ctr Characterist Upland Crops Bre, Fuzhou 350013, Peoples R China

4.Fujian Engn Lab Crop Mol Breeding, Fuzhou 350013, Peoples R China

5.Fujian Acad Agr Sci, Inst Agr Qual Stand & Testing Technol Res, Fuzhou 350003, Peoples R China

6.Fujian Key Lab Agroprod Qual & Safety, Fuzhou 350003, Peoples R China

关键词： Grain Zn content; Yuanjiang common wild rice; Map-based cloning; GZnC1; Zn distribution

期刊名称：PLANT MOLECULAR BIOLOGY （ 影响因子：4.335； 五年影响因子：5.197 ）

ISSN： 0167-4412

年卷期：

页码：

收录情况： SCI

摘要： Zinc (Zn) deficiency, caused by inadequate Zn intake in the human diet, has serious health implications. Rice (Oryza sativa) is the staple food in regions with a high incidence of Zn deficiency, so raising Zn levels in rice grain could help alleviate Zn deficiency. The wild relatives of cultivated rice vary widely in grain Zn content and thus are suitable resources for improving this trait. However, few loci underlying grain Zn content have been identified in wild rice relatives. Here, we identified a major quantitative trait locus for grain Zn content, Grain Zn Content 1 (qGZnC1), from Yuanjiang common wild rice (Oryza rufipogon Griff.) using map-based cloning. Down-regulating GZnC1 expression reduced the grain Zn content, whereas the presence of GZnC1 had the opposite effect, indicating that GZnC1 is involved in grain Zn content in rice. Notably, GZnC1 is identical to a previously reported gene, EMBRYO SAC ABORTION 1 (ESA1), involved in seed setting rate. The mutation in GZnCl/ESA1 at position 1819 ((T)1819(C)) causes delayed termination of protein translation. In addition, GZnC1 is specifically expressed in developing panicles. Several genes related to Zn-transporter genes were up-regulated in the presence of GZnC1. Our results suggest that GZnC1 activates Zn transporters to promote Zn distribution in panicles. Our work thus sheds light on the genetic mechanism of Zn accumulation in rice grain and provides a new genetic resource for improving Zn content in rice.

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