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Molecular mapping and identification of quantitative trait loci for domestication traits in the field cress ( Lepidium campestre L.) genome

Authors
  • Desta, Zeratsion Abera1
  • de Koning, Dirk-Jan1
  • Ortiz, Rodomiro1
  • 1 Swedish University of Agricultural Sciences,
Type
Published Article
Journal
Heredity
Publisher
Springer International Publishing
Publication Date
Feb 19, 2020
Volume
124
Issue
4
Pages
579–591
Identifiers
DOI: 10.1038/s41437-020-0296-x
PMID: 32076125
PMCID: PMC7080786
Source
PubMed Central
Keywords
License
Unknown

Abstract

Lepidium campestre (L.) or field cress is a multifaceted oilseed plant, which is not yet domesticated. Moreover, the molecular and genetic mechanisms underlying the domestication traits of field cress remain largely elusive. The overarching goal of this study is to identify quantitative trait loci (QTL) that are fundamental for domestication of field cress. Mapping and dissecting quantitative trait variation may provide important insights into genomic trajectories underlying field cress domestication. We used 7624 single nucleotide polymorphism (SNP) markers for QTL mapping in 428 F2 interspecific hybrid individuals, while field phenotyping was conducted in F2:3 segregating families. We applied multiple QTL mapping algorithms to detect and estimate the QTL effects for seven important domestication traits of field cress. Verification of pod shattering across sites revealed that the non-shattering lines declined drastically whereas the shattering lines increased sharply, possibly due to inbreeding followed by selection events. In total, 1461 of the 7624 SNP loci were mapped to eight linkage groups (LGs), spanning 571.9 cM map length. We identified 27 QTL across all LGs of field cress genome, which captured medium to high heritability, implying that genomics-assisted selection could deliver domesticated lines in field cress breeding. The use of high throughput genotyping can accelerate the process of domestication in novel crop species. This is the first QTL mapping analysis in the field cress genome that may lay a foundational framework for positional or functional QTL cloning, introgression as well as genomics-assisted breeding in field cress domestication.

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