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Meta-analysis of major QTL for abiotic stress tolerance in barley and implications for barley breeding

journal contribution
posted on 2023-05-19, 01:40 authored by Zhang, X, Sergey ShabalaSergey Shabala, Anthony KoutoulisAnthony Koutoulis, Svetlana ShabalaSvetlana Shabala, Meixue ZhouMeixue Zhou
Drought, salinity and waterlogging are three major abiotic stresses limiting barley yield worldwide. Breeding for abiotic stress-tolerant crops has drawn increased attention, and a large number of quantitative trait loci (QTL) for drought, salinity, and waterlogging tolerance in barley have been detected. However, very few QTL have been successfully used in marker-assisted selection (MAS) in breeding. In this study, we summarized 632 QTL for drought, salinity and waterlogging tolerance in barley. Among all these QTL, only 195 major QTL were used to conduct meta-analysis to refine QTL positions for MAS. Meta-analysis was used to map the summarized major QTL for drought, salinity, and waterlogging tolerance from different mapping populations on the barley physical map. The positions of identified meta-QTL (MQTL) were used to search for candidate genes for drought, salinity, and waterlogging tolerance in barley. Both MQTL3H.4 and MQTL6H.2 control drought tolerance in barley. Fine-mapped QTL for salinity tolerance, HvNax4 and HvNax3, were validated on MQTL1H.4 and MQTL7H.2, respectively. MQTL2H.1 and MQTL5H.3 were also the target regions for improving salinity tolerance in barley. MQTL4H.4 is the main region controlling waterlogging tolerance in barley with fine-mapped QTL for aerenchyma formation under waterlogging conditions. Detected and refined MQTL and candidate genes are crucial for future successful MAS in barley breeding.

Funding

Australian Research Council

Department of Natural Resources and Environment Tasmania

History

Publication title

Planta

Volume

245

Article number

283-295

Number

283-295

Pagination

1-13

ISSN

0032-0935

Department/School

Tasmanian Institute of Agriculture (TIA)

Publisher

Springer

Place of publication

Germany

Rights statement

Copyright 2016 Springer-Verlag Berlin Heidelberg

Repository Status

  • Restricted

Socio-economic Objectives

Barley

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