Natural variations in stearoyl-acp desaturase genes affect the conversion of stearic to oleic acid in maize kernel
文献类型： 外文期刊
作者：
Han, Yingjia
1
;
Xu, Gen
1
;
Du, Hewei
2
;
Hu, Jieyun
1
;
Liu, Zhanji
3
;
Li, Hui
4
;
Li, Jiansheng
1
;
Yang, Xiaohong
1
;
作者机构： 1.China Agr Univ, Natl Maize Improvement Ctr China, Beijing Key Lab Crop Genet Improvement, Beijing 100193, Peoples R China
2.Yangtze Univ, Coll Life Sci, Jingzhou 434025, Hunan, Peoples R China
3.Shandong Acad Agr Sci, Shandong Cotton Res Ctr, Jinan 250100, Peoples R China
4.Univ Jinan, Sch Biol Sci & Technol, Jinan 250022, Shandong, Peoples R China
期刊名称：THEORETICAL AND APPLIED GENETICS （ 影响因子：5.699； 五年影响因子：5.565 ）
ISSN： 0040-5752
年卷期： 2017 年 130 卷 1 期
页码：
收录情况： SCI
摘要： We identified 11 SAD genes, and mined their natural variations associated with the conservation of stearic to oleic acid, especially ZmSAD1 supported by both the QTL and an expression QTL. Maize oil is generally regarded as a healthy vegetable oil owing to its low abundance of saturated fatty acids. Stearoyl-ACP desaturase (SAD) is a key rate-limiting enzyme for the conservation of stearic (C18:0) to oleic (C18:1) acid. Here, 11 maize SAD genes were identified to have more divergent functions than Arabidopsis SAD genes. The genomic regional associations in a maize panel including 508 inbred lines identified 6 SAD genes significantly associated (P < 0.01) with the C18:0/C18:1 ratio or the level of C18:0 or C18:1, one gene of which co-localized with a quantitative trait locus (QTL) and 5 of which co-localized with an expression QTL. ZmSAD1, supported by both the QTL and an expression QTL, had the largest effect on C18:0/C18:1. One nonsynonymous single-nucleotide polymorphism in exon 3 and one 5-bp insertion/deletion in the 3' untranslated region were further shown to contribute to the natural variation in C18:0/C18:1 according to ZmSAD1-based association mapping. Finally, selection tests of ZmSAD1 in teosinte, regular maize, and high-oil maize indicated that ZmSAD1 was not a selection target during the process of maize domestication and high-oil maize development. These results will guide the manipulation of the ratio between saturated and unsaturated fatty acids in maize.
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