Journal of Integrative Agriculture

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花生百果重、百仁重和出仁率多效性QTL发掘和KASP标记开发

  

  • 修回日期:2024-06-27

Identification of a pleiotropic QTL and development KASP markers for HPW, HSW, and SP in peanut

Xiukun Li1*, Jing Hao1*, Hongtao Deng1*, Shunli Cui1, Li Li2, Mingyu Hou1, Yingru Liu1, Lifeng Liu1#   

  1. 1 State Key Laboratory of North China Crop Improvement and Regulation, Key Laboratory for Crop Germplasm Resources of Hebei, North China Key Laboratory for Crop Germplasm Resources of Education Ministry, College of Agronomy, Hebei Agricultural University, Baoding 071001, China

    2 School of Landscape and Ecological Engineering, Hebei University of Engineering, Handan 056038, China

  • Revised:2024-06-27
  • About author:#Correspondence Lifeng Liu, E-mail: liulifeng@hebau.edu.cn *These authors contributed equally to this manuscript.
  • Supported by:
    This study was financially sponsored by the National Natural Science Foundation of China (320720977), the China Agriculture Research System (CARS-13), Hebei Agriculture Research System (HBCT2024040205), S&T Program of Hebei (23567601H), the Peanut Modern Seed Industry Technology Innovation Team in Hebei Province, China (21326316D-2), the State Key Laboratory of North China Crop Improvement and Regulation, China (NCCIR2020RC-2), and the Startup Fund of Hebei Agricultural University, China (YJ2020044).

摘要:

高产一直是花生育种的首要目标。百果重(HPW)、百仁重(HSW)和出仁率(SP)是花生产量的重要组成部分。本研究旨在通过对“四粒红”(多粒型)与“冀农黑3号”(普通型)杂交的重组自交系(RILs)进行重测序,构建高密度连锁图谱。该图谱由4499bin组成,分布在20条染色体上,全长1712.32 cM,平均标记间距离为0.38 cM。在3种环境中共鉴定出46QTL位点。其中,主效QTL位点qHPW5.2qHPW18.1qSP7.1qSP8.1qSP8.2qSP18.1qSP18.2的表型变异解释分别为12.0411.4116.5324.1710.4910.8229.89%。的14QTL在多个环境中被检测到,认为是稳定的QTL1QTL (qHPW7qHSW7.1qSP7)3个性状均相关,对HPWHSWSP的表型变异解释分别为8.919.0416.53%。利用美国微核心种质进行全基因组关联来验证QTL定位的准确性。在两种环境中,共检测到115SNP与百果重、百仁重和出仁率显著相关。6SNP2个性状同时相关,平均解释13.84%的表型变异。结合两个定位群体,关联分析群体中在 7号染色体上与SP显著相关的SNPAX-176802178,同时位于RIL群体主效QTL qSP7置信区间内。此外,还开发了3KASP标记,并在花生农家种和品种中进行了验证。这些QTL为了解花生HPWHSWSP的遗传基础提供了有价值的见解,并为花生标记辅助育种提供有用的分子标记。

Abstract:

 High yield has always been the primary objective of peanut breeding.  100-pod weight (HPW), 100-seed weight (HSW), and shelling percentage (SP), are crucial components of peanut yield.  This study aimed to construct a high-density linkage map by resequencing the recombined inbred lines (RILs) derived from a cross between “Silihong” (A. hypogaea var. fastigiate) and “Jinonghei 3” (A. hypogaea var. hypogaea).  The map consisted of 4,499 bins spread across 20 chromosomes, totaling 1712.32 cM in length with an average inter-marker distance of 0.38 cM.  A total of 46 quantitative trait loci (QTLs) were identified across three environments. The major QTLs, including qHPW5.2, qHPW18.1, qSP7.1, qSP8.1, qSP8.2, qSP18.1, and qSP18.2, exhibited PVE (phenotypic variation explained) of 12.04, 11.41, 16.53, 24.17, 10.49, 10.82, and 29.89%, respectively.  Fourteen QTLs identified across multiple environments were considered stable.  One QTL (qHPW7, qHSW7.1, qSP7) was associated with all three traits, with the PVE value of 8.91, 9.04, and 16.53% for HPW, HSW, and SP, respectively.  The genome-wide association study was conducted using the US mini-core collection to validate the accuracy of QTL mapping.  Across two environments, 115 single-nucleotide polymorphisms (SNPs) were significantly associated with HPW, HSW, and SP in the association panel.  Six SNPs were associated with two traits, explaining an average phenotypic variation of 13.84%.  Combining the two mapping populations, AX-176802178, detected on chromosome 7 in the association panel, which controlled SP, was located within the QTL qSP7 confidence interval defined by the RILs.  Moreover, three KASP markers were developed and validated in peanut landraces and varieties.  These QTLs might offer valuable insights for understanding the genetic basis of HPW, HSW, and SP and provide useful molecular markers for marker-assisted breeding in peanuts.

Key words: Arachis hypogaea L. , GWAS ,  , KASP ,  , QTL mapping ,  , shelling percentage