Abstract
Key message
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.
Abstract
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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Acknowledgments
We greatly appreciate Dr. Jianbing Yan and Mr. Haijun Liu for providing the genotyping-by-sequencing data for the maize association panel. We also appreciate the helpful comments on the manuscript from three anonymous reviewers. This research was supported by the National Natural Science Foundation of China (Grant Number 31361140362) and the Program for New Century Excellent Talents in University of the Ministry of Education of China (Grant Number 2014FG049).
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Communicated by A. A. Franco Garcia.
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Han, Y., Xu, G., Du, H. et al. Natural variations in stearoyl-acp desaturase genes affect the conversion of stearic to oleic acid in maize kernel. Theor Appl Genet 130, 151–161 (2017). https://doi.org/10.1007/s00122-016-2800-5
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DOI: https://doi.org/10.1007/s00122-016-2800-5