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Review Article|01 Jan 2020|OPEN
Molecularly tagged genes and quantitative trait loci in cucumber with recommendations for QTL nomenclature
Yuhui Wang1, Kailiang Bo2, Xingfang Gu2, Junsong Pan3, Yuhong Li4, Jinfeng Chen5, Changlong Wen6, Zhonghai Ren7, Huazhong Ren8, Xuehao Chen9, Rebecca Grumet10 & Yiqun Weng1,11,
1Department of Horticulture, University of Wisconsin, Madison, WI 53706, USA
2Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, China
3Department of Plant Sciences, Shanghai Jiaotong University, Shanghai 200240, China
4Horticulture College, Northwest A&F University, Yangling 712100, China
5Horticulture College, Nanjing Agricultural University, Nanjing 210095, China
6Beijing Vegetable Research Center, Beijing Academy of Agricultural and Forestry Sciences, Beijing 100097, China
7College of Horticulture Science and Engineering, Shandong Agricultural University, Tai’an 271018, China
8College of Horticulture, China Agricultural University, Beijing 100193, China
9College of Horticulture and Plant Protection, Yangzhou University, Yangzhou 225009, China
10Department of Horticulture, Michigan State University, East Lansing, MI 48824, USA
11USDAARS Vegetable Crops Research Unit, 1575 Linden Dr., Madison, WI 53706, USA

Horticulture Research 7,
Article number: 20003 (2020)
doi: 10.1038/hortres.2020.3
Views: 414

Received: 19 Apr 2019
Revised: 05 Oct 2019
Accepted: 08 Nov 2019
Published online: 01 Jan 2020

Abstract

Cucumber, Cucumis sativus L. (2n = 2x = 14), is an important vegetable crop worldwide. It was the first specialty crop with a publicly available draft genome. Its relatively small, diploid genome, short life cycle, and self-compatible mating system offers advantages for genetic studies. In recent years, significant progress has been made in molecular mapping, and identification of genes and QTL responsible for key phenotypic traits, but a systematic review of the work is lacking. Here, we conducted an extensive literature review on mutants, genes and QTL that have been molecularly mapped or characterized in cucumber. We documented 81 simply inherited trait genes or major-effect QTL that have been cloned or fine mapped. For each gene, detailed information was compiled including chromosome locations, allelic variants and associated polymorphisms, predicted functions, and diagnostic markers that could be used for marker-assisted selection in cucumber breeding. We also documented 322 QTL for 42 quantitative traits, including 109 for disease resistances against seven pathogens. By alignment of these QTL on the latest version of cucumber draft genomes, consensus QTL across multiple studies were inferred, which provided insights into heritable correlations among different traits. Through collaborative efforts among public and private cucumber researchers, we identified 130 quantitative traits and developed a set of recommendations for QTL nomenclature in cucumber. This is the first attempt to systematically summarize, analyze and inventory cucumber mutants, cloned or mapped genes and QTL, which should be a useful resource for the cucurbit research community.