First Genetic Linkage Map of Based on RNA Sequencing-derived Markers: Key Tool for Genetic Mapping of Disease Resistance

Overview

Journal Hortic Res

Publisher Oxford University Press

Date 2018 Sep 6

PMID 30181885

Citations 9

Authors

Carmen Santos

Nuno Felipe Almeida

Mara Lisa Alves

Ralf Horres

Nicolas Krezdorn

Susana Trindade Leitao

Thais Aznar-Fernandez

Bjorn Rotter

Peter Winter

Diego Rubiales

Maria Carlota Vaz Patto

Affiliations

Soon will be listed here.

Abstract

The transcriptome was analysed in response to rust () infection to develop novel molecular breeding tools with potential for genetic mapping of resistance in this robust orphan legume species. One RNA-seq library each was generated from control and rust-inoculated leaves from two genotypes with contrasting quantitative resistance, assembled into contigs and sequence polymorphisms were identified. , 19,224 SNPs differentiate the susceptible from the partially resistant genotype's transcriptome. In addition, we developed and tested 341 expressed E-SSR markers from the contigs, of which 60.7% varied between the two genotypes. A first linkage map was created using part of the developed markers in a RIL population from the cross of the two genotypes. This map contains 307 markers, covered 724.2 cM and is organised in 7 major and 2 minor linkage groups, with an average mapping interval of 2.4 cM. The genic markers also enabled us to compare their position in map with the physical position of the same markers mapped on genome, highlighting a high macrosyntenic conservation between both species. This study provides a large new set of genic polymorphic molecular markers with potential for mapping rust resistances. It represents the first step towards genomics-assisted precision breeding in .

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