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Identification of Quantitative Trait Loci Relating to Flowering Time, Flag Leaf and Awn Characteristics in a Novel Triticum dicoccum Mapping Population.

Published version
Peer-reviewed

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Authors

Wright, Tally IC 
Griffiths, Howard 
Kadner, Maxime 
Powell, James S 

Abstract

Tetraploid landraces of wheat harbour genetic diversity that could be introgressed into modern bread wheat with the aid of marker-assisted selection to address the genetic diversity bottleneck in the breeding genepool. A novel bi-parental Triticum turgidum ssp. dicoccum Schrank mapping population was created from a cross between two landrace accessions differing for multiple physiological traits. The population was phenotyped for traits hypothesised to be proxies for characteristics associated with improved photosynthesis or drought tolerance, including flowering time, awn length, flag leaf length and width, and stomatal and trichome density. The mapping individuals and parents were genotyped with the 35K Wheat Breeders' single nucleotide polymorphism (SNP) array. A genetic linkage map was constructed from 104 F4 individuals, consisting of 2066 SNPs with a total length of 3295 cM and an average spacing of 1.6 cM. Using the population, 10 quantitative trait loci (QTLs) for five traits were identified in two years of trials. Three consistent QTLs were identified over both trials for awn length, flowering time and flag leaf width, on chromosomes 4A, 7B and 5B, respectively. The awn length and flowering time QTLs correspond with the major loci Hd and Vrn-B3, respectively. The identified marker-trait associations could be developed for marker-assisted selection, to aid the introgression of diversity from a tetraploid source into modern wheat for potential physiological trait improvement.

Description

Keywords

QTL mapping, SNP genotyping, Tritcum dicoccum, genetic diversity, physiology, tetraploid landraces, wheat

Journal Title

Plants (Basel)

Conference Name

Journal ISSN

2223-7747
2223-7747

Volume Title

9

Publisher

MDPI AG
Sponsorship
Biotechnology and Biological Sciences Research Council (BB/L000148/1)
Biotechnology and Biological Sciences Research Council (BB/P027970/1)