Abstract
Key message
AhyHOF1, likely encoding a WRI1 transcription factor, plays critical roles in peanut oil synthesis.
Abstract
Although increasing the oil content of peanut to meet growing demand has long been a primary aim of breeding programs worldwide, the mining of genetic resources to achieve this objective has obviously lagged behind that of other oil crops. In the present study, we developed an advanced recombinant inbred line population containing 192 F9:11 families derived from parents JH5 and KX01-6. We then constructed a high-resolution genetic map covering 3,706.382 cM, with an average length of 185.32 cM per linkage group, using 2840 polymorphic SNPs. Two stable QTLs, qCOA08_1 and qCOA08_2 having the highest contributions to genetic variation (16.1% and 20.7%, respectively), were simultaneously detected in multiple environments and closely mapped within physical intervals of approximately 2.9 Mb and 1.7 Mb, respectively, on chromosome A08. In addition, combined analysis of whole-genome and transcriptome resequencing data uncovered a strong candidate gene encoding a WRI1 transcription factor and differentially expressed between the two parents. This gene, designated as High Oil Favorable gene 1 in Arachis hypogaea (AhyHOF1), was hypothesized to play roles in oil accumulation. Examination of near-inbred lines of #AhyHOF1/#Ahyhof1 provided further evidence that AhyHOF1 increases oil content, mainly by affecting the contents of several fatty acids. Taken together, our results provide valuable information for cloning the favorable allele for oil content in peanut. In addition, the closely linked polymorphic SNP markers within qCOA08_1 and qCOA08_2 loci may be useful for accelerating marker-assisted selection breeding of peanut.
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Data availability
All of the original re-sequencing data used in this study have been submitted to the public database of GSA (Genome Sequence Archive) with GSA accessions numbers CRA007578 and CRA007525, respectively.
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Acknowledgements
We thank Liwen Bianji (Edanz) (www.liwenbianji.cn/ac) for editing the English text of a draft of this manuscript.
Funding
This work was jointly supported by the earmarked fund for CARS-13; The modern agricultural industrial technology system of Hebei Province (HBCT2018090101, HBCT2018090201); The Science and Technology Innovation Team of modern peanut seed industry (21326316D); Technology Innovation Special Project (2022KJCXZX-LYS-11); Basic Research Funds of Hebei Academy of Agriculture and Forestry Sciences (2021060201) and Talents construction project of science and technology innovation, Hebei Academy of Agriculture and Forestry Sciences (C22R0311).
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YY and JW designed the experiments and analyzed the data; JW, QS, YL, ZC XJ, and YS carried out the experiments; YY wrote the paper, and JW critically revised the paper.
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Yang, Y., Li, Y., Cheng, Z. et al. Genetic analysis and exploration of major effect QTLs underlying oil content in peanut. Theor Appl Genet 136, 97 (2023). https://doi.org/10.1007/s00122-023-04328-8
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DOI: https://doi.org/10.1007/s00122-023-04328-8