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Plant function and evolutionary biology
RESEARCH ARTICLE (Open Access)

Identification of salt tolerance QTL in a wheat RIL mapping population using destructive and non-destructive phenotyping

Muhammad A. Asif A B , Melissa Garcia A B C , Joanne Tilbrook A B , Chris Brien https://orcid.org/0000-0003-0581-1817 A D E , Kate Dowling A D , Bettina Berger B D , Rhiannon K. Schilling A B , Laura Short A B , Christine Trittermann A B , Matthew Gilliham B F , Delphine Fleury A B C G , Stuart J. Roy https://orcid.org/0000-0003-0411-9431 A B C H and Allison S. Pearson A B F
+ Author Affiliations
- Author Affiliations

A Australian Centre for Plant Functional Genomics, PMB 1, Glen Osmond, SA 5064, Australia.

B School of Agriculture, Food and Wine & Waite Research Institute, The University of Adelaide, PMB 1, Glen Osmond, SA 5064, Australia.

C ARC Industrial Transformation Research Hub for Wheat in a Hot and Dry Climate, The University of Adelaide, PMB1, Glen Osmond, SA 5064, Australia.

D Australian Plant Phenomics Facility, The Plant Accelerator, The University of Adelaide, SA 5064, Australia.

E School of Information Technology and Mathematical Sciences, The University of South Australia, GPO Box 2471, Adelaide, SA 5001, Australia.

F ARC Centre of Excellence in Plant Energy Biology, Waite Research Institute, The University of Adelaide, PMB 1, Glen Osmond, SA 5064, Australia.

G Innolea, 6 chemin de Panedautes, 31700, Mondonville, France.

H Corresponding author. Email: stuart.roy@adelaide.edu.au

Functional Plant Biology 48(2) 131-140 https://doi.org/10.1071/FP20167
Submitted: 12 June 2020  Accepted: 31 July 2020   Published: 24 August 2020

Journal Compilation © CSIRO 2021 Open Access CC BY-NC-ND

Abstract

Bread wheat (Triticum aestivum L.) is one of the most important food crops, however it is only moderately tolerant to salinity stress. To improve wheat yield under saline conditions, breeding for improved salinity tolerance of wheat is needed. We have identified nine quantitative trail loci (QTL) for different salt tolerance sub-traits in a recombinant inbred line (RIL) population, derived from the bi-parental cross of Excalibur × Kukri. This population was screened for salinity tolerance subtraits using a combination of both destructive and non-destructive phenotyping. Genotyping by sequencing (GBS) was used to construct a high-density genetic linkage map, consisting of 3236 markers, and utilised for mapping QTL. Of the nine mapped QTL, six were detected under salt stress, including QTL for maintenance of shoot growth under salinity (QG(1-5).asl-5A, QG(1-5).asl-7B) sodium accumulation (QNa.asl-2A), chloride accumulation (QCl.asl-2A, QCl.asl-3A) and potassium : sodium ratio (QK:Na.asl-2DS2). Potential candidate genes within these QTL intervals were shortlisted using bioinformatics tools. These findings are expected to facilitate the breeding of new salt tolerant wheat cultivars.

Additional keywords: chloride, non-destructive phenotyping, potassium, salinity, shoot ion-independent tolerance, sodium, quantitative trait locus, wheat.


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