Journal of Integrative Agriculture ›› 2023, Vol. 22 ›› Issue (11): 3331-3345.DOI: 10.1016/j.jia.2023.02.014

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基于SLAF标记甜瓜果实相关性状和果肉硬度主要候选QTL位点ff2.1的定位

  

  • 收稿日期:2022-10-10 接受日期:2022-11-01 出版日期:2023-11-20 发布日期:2023-11-08

SLAF marker based QTL mapping of fruit-related traits reveals a major-effect candidate locus ff2.1 for flesh firmness in melon

CHEN Ke-xin*, DAI Dong-yang*, WANG Ling, YANG Li-min, LI Dan-dan, WANG Chao, JI Peng, SHENG Yun-yan#   

  1. Department of Horticulture and Landscape Architecture, Heilongjiang Bayi Agricultural University, Daqing 163309, P.R.China
  • Received:2022-10-10 Accepted:2022-11-01 Online:2023-11-20 Published:2023-11-08
  • About author:#Correspondence SHENG Yun-yan, Tel: +86-459-6819610, E-mail: shengyunyan@byau.edu.cn * These authors contributed equally to this study.
  • Supported by:
    We thank the Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences for providing melon plant samples.  This work was supported by the grants from the National Natural Science Foundation of China (31772330 and 32002043), the Natural Science Foundation of the Heilongjiang Province, China (LH2022C065) and the Heilongjiang Bayi Agricultural University Support Program for SanHengSanZong, China (TDJH202004).

摘要:

甜瓜果肉硬度(Flesh firmness, FF)是农业生产者和消费者关注的一个复杂重要的性状,目前针对甜瓜果肉硬度性状的遗传机制尚不清楚。本研究以软果肉甜瓜“P5”和硬果肉甜瓜“P10”配置杂交组合,构建F2分离群体,通过QTL-SLAF测序和分子标记连锁分析,共鉴定112,844SLAF位点,使用5,919SNP标记构建了总遗传距离为1356.49 cM的连锁图谱。结合两年田间表型分析显示,控制果实长度(Fruit Length, FL)和宽度(Fruit Diameter, FD)的QTLs位点位于同一区间,控制单果重(Single-Fruit Weight, SFW)性状的QTL位于两条不同的染色体上。对于果肉硬度检测到一个主要QTL位点ff2.1位于甜瓜2号染色体0.17 Mb的候选区域。利用429F2单株,将ff2.1候选区间缩小到28.3 kb区域,包含3个候选基因。本研究不仅鉴定了一个控制甜瓜果肉硬度的QTLs位点,同时也为甜瓜基因功能基因的研究提供了理论基础。

Abstract:

Flesh firmness (FF) is an important and complex trait for melon breeders and consumers.  However, the genetic mechanism underlying FF is unclear.  Here, a soft fruit melon (P5) and a hard fruit melon (P10) were crossed to generate F2, and the FF and fruit-related traits were recorded for two years.  By performing quantitative trait locus (QTL) specific-locus amplified fragment (SLAF) (QTL-SLAF) sequencing and molecular marker-linkage analysis, 112 844 SLAF markers were identified, and 5 919 SNPs were used to construct a genetic linkage map with a total genetic distance of 1 356.49 cM.  Ten FF- and fruit-related QTLs were identified.  Consistent QTLs were detected for fruit length (FL) and fruit diameter (FD) in both years, and QTLs for single fruit weight (SFW) were detected on two separate chromosomes in both years.  For FF, the consistent major locus (ff2.1) was located in a 0.17-Mb candidate region on chromosome 2.  Using 429 F2 individuals derived from a cross between P5 and P10, we refined the ff2.1 locus to a 28.3-kb region harboring three functional genes.  These results provide not only a new candidate QTL for melon FF breeding but also a theoretical foundation for research on the mechanism underlying melon gene function.

Key words: QTL mapping ,  flesh firmness ,  fruit-related traits ,  melon ,  and SLAF sequencing