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Genetic basis of kernel nutritional traits during maize domestication and improvement

文献类型： 外文期刊

作者： Fang, Hui 1 ; Fu, Xiuyi 1 ; Wang, Yuebin 3 ; Xu, Jing 1 ; Feng, Haiying 1 ; Li, Weiya 1 ; Xu, Jieting 3 ; Jittham, Orawan 1 ;

作者机构： 1.China Agr Univ, Natl Maize Improvement Ctr China, Beijing Key Lab Crop Genet Improvement, MOA Key Lab Maize Biol,State Key Lab Plant Physio, Beijing 100193, Peoples R China

2.Beijing Acad Agr & Forestry Sci, Maize Res Ctr, Beijing 100097, Peoples R China

3.Huazhong Agr Univ, Natl Key Lab Crop Genet Improvement, Wuhan 430070, Hubei, Peoples R China

关键词： Oil; Carotenoid; Domestication and improvement; Genetic basis; Selection

期刊名称：PLANT JOURNAL （ 影响因子：6.417； 五年影响因子：7.627 ）

ISSN： 0960-7412

年卷期： 2020 年 101 卷 2 期

页码：

收录情况： SCI

摘要： The nutritional traits of maize kernels are important for human and animal nutrition, and these traits have undergone selection to meet the diverse nutritional needs of humans. However, our knowledge of the genetic basis of selecting for kernel nutritional traits is limited. Here, we identified both single and epistatic quantitative trait loci (QTLs) that contributed to the differences of oil and carotenoid traits between maize and teosinte. Over half of teosinte alleles of single QTLs increased the values of the detected oil and carotenoid traits. Based on the pleiotropism or linkage information of the identified single QTLs, we constructed a trait-locus network to help clarify the genetic basis of correlations among oil and carotenoid traits. Furthermore, the selection features and evolutionary trajectories of the genes or loci underlying variations in oil and carotenoid traits revealed that these nutritional traits produced diverse selection events during maize domestication and improvement. To illustrate more, a mutator distance-relative transposable element (TE) in intron 1 of DXS2, which encoded a rate-limiting enzyme in the methylerythritol phosphate pathway, was identified to increase carotenoid biosynthesis by enhancing DXS2 expression. This TE occurs in the grass teosinte, and has been found to have undergone selection during maize domestication and improvement, and is almost fixed in yellow maize. Our findings not only provide important insights into evolutionary changes in nutritional traits, but also highlight the feasibility of reintroducing back into commercial agricultural germplasm those nutritionally important genes hidden in wild relatives.

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