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Journal of Integrative Agriculture  2023, Vol. 22 Issue (8): 2323-2334    DOI: 10.1016/j.jia.2023.02.005
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A stable and major QTL region on chromosome 2 conditions pod shape in cultivated peanut (Arachis hyopgaea L.)

ZHANG Sheng-zhong1, HU Xiao-hui1, WANG Fei-fei1, CHU Ye2, YANG Wei-qiang1, XU Sheng3, WANG Song4, WU Lan-rong5, YU Hao-liang6, MIAO Hua-rong1#, FU Chun7#, CHEN Jing1#

1 Shandong Peanut Research Institute, Qingdao 266100, P.R.China

2 Department of Horticulture, University of Georgia Tifton Campus, Tifton, GA 31793, the United States

3 Anhui General Station of Agricultural Technology Extension, Hefei 230001, P.R.China

4 Anhui Academy of Agricultural Sciences, Hefei 230001, P.R.China

5 Qingdao Agricultural Technology Extension Center, Qingdao 266071, P.R.China

6 Yantai Fenglin Foodstuff Co., Ltd., Yantai 264108, P.R.China

7 Weifang Academy of Agricultural Sciences, Weifang 261071, P.R.China

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摘要  荚果形状是影响花生荚果制品市场价值的重要可遗传性状。为探索该性状内在遗传机制,本研究基于图像分析考察了影响荚果性状的6个组分性状,包括荚果长度、荚果宽度、荚果长宽比、荚果圆度、果喙明显度和缢缩明显度。对含有181个家系的重组自交系群体进行了三个不同环境下的表型测定。结果表明,该群体的6个组分性状均表现为连续分布和超亲遗传,且各组分性状之间表现为不同程度相关性,广义遗传率变异范围为0.87-0.95。数量性状位点(QTL)分析共鉴定到26个加性QTL,分别解释3.79%~52.37%的表型变异。在花生第2染色体上发现一个可调控多个组分性状的稳定主效遗传位点。该位点覆盖10.81 Mb物理区间,包含543个潜在基因,生物信息学分析对候选基因进行了预测。本研究还针对6个组分性状鉴定到73对上位性互作(涉及92个遗传位点),分别可解释0.94%-6.45%表型变异。以上研究结果为荚果形状相关基因的图位克隆与分子标记辅助育种提供了重要研究基础。

Abstract  Peanut pod shape is a heritable trait which affects the market acceptance of in-shell peanut products.  In order to determine the genetic control of pod shape, six component traits of pod shape (pod length, pod width, pod length/width ratio, pod roundness, beak degree and constriction degree) were measured using an image-based phenotyping method.  A recombinant inbred line (RIL) population consisting of 181 lines was phenotyped across three environments.  Continuous distributions and transgressive segregations were demonstrated in all measured traits and environments.   Significant correlations were found among most component traits with broad-sense heritability ranging from 0.87 to 0.95.  Quantitative trait locus (QTL) analysis yielded 26 additive QTLs explaining 3.79 to 52.37% phenotypic variations.  A novel, stable and major QTL region conditioning multiple shape features was detected on chromosome 2, which spans a 10.81-Mb genomic region with 543 putative genes.  Bioinformatics analysis revealed several candidate genes in this region.  In addition, 73 pairs of epistatic interactions involving 92 loci were identified for six component traits explaining 0.94–6.45% phenotypic variations.  These results provide new genetic loci to facilitate genomics-assisted breeding of peanut pod shape.
Keywords:  peanut       pod shape        quantitative trait locus        additive effect        epistasis  
Received: 18 August 2022   Accepted: 19 December 2022
Fund: This research was supported by the National Natural Science Foundation of China (32001584), the Natural Science Foundation of Shandong Province, China (ZR202111290099), the Breeding Project from Department Science & Technology of Shandong Province, China (2020LZGC001), the Agricultural Scientific and the Technological Innovation Project of Shandong Academy of Agricultural Sciences, China (CXGC2022A21, CXGC2022A03, and CXGC2023A06 (A39 and A46)), and the Qingdao People’s Livelihood Science and Technology Program, China (20-3-4-26-nsh).
About author:  ZHANG Sheng-zhong, E-mail: 593318769@qq.com; #Correspondence MIAO Hua-rong, E-mail: 1949813628@qq.com; FU Chun, E-mail: nkyhssf@163.com; CHEN Jing, Tel: +86-532-87631512, E-mail: mianbaohua2008@126.com

Cite this article: 

ZHANG Sheng-zhong, HU Xiao-hui, WANG Fei-fei, CHU Ye, YANG Wei-qiang, XU Sheng, WANG Song, WU Lan-rong, YU Hao-liang, MIAO Hua-rong, FU Chun, CHEN Jing. 2023. A stable and major QTL region on chromosome 2 conditions pod shape in cultivated peanut (Arachis hyopgaea L.). Journal of Integrative Agriculture, 22(8): 2323-2334.

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