Abstract
The seed oil content in soybean is an important trait that drives successful soybean quality. A recombination of inbred lines derived from a cross between the ‘Charleston’ and ‘Dongnong594’ cultivars was planted in one location (HRB) across 13 years and two locations (HXL and JMS) across 6 years in China (25 environments in total), and the genetic effects were partitioned into additive main effects, epistatic main effects and their environmental interaction effects using composite interval mapping and inclusive composite interval mapping models based on a high-density genetic map. Twelve main-effect quantitative trait loci (QTLs) were identified on chromosomes Ch3, Ch4, Ch6, Ch13, Ch15, Ch17, Ch18,Ch19 and Ch20 and detected in more than two environments. Among the intervals of the main-effect QTLs, eleven candidate genes were screened for their involvement in seed oil content and/or fatty acid biosynthesis and metabolism processes based on gene ontology and annotation information, moreover, the main effect QTL were identified in a wild soybean chromosome segment substitution lines population, the phenotype and the QTL fragment showed the identity relationship significantly. Furthermore, an analysis of epistatic interactions showed that four epistatic QTL pairs were detected, and they could explain approximately 70% of the phenotypic variation interaction with environments in total. The additive main-effect QTLs and epistatic QTL pairs contributed to high phenotypic variation under multiple environments, and the results were also validated and corroborated with previous research, indicating that marker-assisted selection can be used to improve soybean oil content and that the candidate genes can also be used as a foundation data set for research on gene functions.
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Acknowledgements
This study was conducted in the Key Laboratory of Soybean Biology in Chinese Ministry of Education in Heilongjiang Province and financially supported by National Key R & D Program of the Ministry of Science and Technology of China (2016YFD0100500, 2016YFD0100300, 2016YFD0100201-21), the Research Fund for the national natural science foundation of China (31471516, 31401465, 31400074, 31501332), the China Post Doctoral Project (2015M581419), “Dongnongxuezhe project (To Chen QS)” “Young Talent project (To Qi ZM, 518062)” of Northeast agriculture university, SIPT Project of Northeast Agricultural University (201610224146), Heilongjiang Funds for Distinguished Young Scientists (JC2016004) and the outstanding academic leaders projects of Harbin (2015RQXXJ018).
Author’s contribution
Qi ZM, Qi HD and Zhang JZ contributed equally to this research. Che DD and Chen QS designed and conducted field tests and drafted the manuscript. Qi HD, Zhang XY, Xin DW and Yin ZG provided field management and protein test data. Qi ZM, Jiang HW, Zhang ZG, Zhu RS, Liu CY, Han X, Zhang JZ and Hu ZB provided the data mapping analysis, Qi ZM, Chen QS and Che DD designed the experiment, organized manuscript. All authors read and approved the final manuscript. Authors state that the experiments comply with the current laws of the country in which they were performed.
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Zhaoming, Q., Xiaoying, Z., Huidong, Q. et al. Identification and validation of major QTLs and epistatic interactions for seed oil content in soybeans under multiple environments based on a high-density map. Euphytica 213, 162 (2017). https://doi.org/10.1007/s10681-017-1952-y
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DOI: https://doi.org/10.1007/s10681-017-1952-y