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QTLs for stomatal and photosynthetic traits related to salinity tolerance in barley

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posted on 2023-05-19, 01:41 authored by Liu, X, Fan, Y, Mak, M, Babla, M, Holford, P, Wang, F, Chen, G, Scott, G, Wang, G, Sergey ShabalaSergey Shabala, Meixue ZhouMeixue Zhou, Chen, Z-H

Background: Stomata regulate photosynthesis and transpiration, and these processes are critical for plant responses to abiotic stresses such as salinity. A barley double haploid population with 108 lines derived from a cross between CM72 (salt-tolerant) and Gairdner (salt-sensitive) was used to detect quantitative trait loci (QTLs) associated with stomatal and photosynthetic traits related to salinity tolerance.

Results: A total of 11 significant QTLs (LOD > 3.0) and 11 tentative QTLs (2.5 < LOD < 3.0) were identified. These QTLs are distributed on all the seven chromosomes, except 5H and explain 9.5–17.3% of the phenotypic variation. QTLs for biomass, intercellular CO2 concentration, transpiration rate and stomatal conductance under control conditions co-localised together. A QTL for biomass also co-located with one for transpiration rate under salinity stress. A linkage was found between stomatal pore area and gas exchange. A QTL for salinity tolerance also co-localised with QTLs for grain yield and biomass on chromosome 3H. Based on the draft barley genome, the candidate genes for salinity tolerance at this locus are proposed.

Conclusions: The lack of major QTLs for gas exchange and stomatal traits under control and saline conditions indicates a complex relationship between salinity and leaf gas exchange due to the fact that these complex quantitative traits are under the control of multiple genes.

History

Publication title

BMC Genomics

Volume

18

Article number

9

Number

9

Pagination

1-13

ISSN

1471-2164

Department/School

Tasmanian Institute of Agriculture (TIA)

Publisher

Biomed Central Ltd

Place of publication

Middlesex House, 34-42 Cleveland St, London, England, W1T 4Lb

Rights statement

Copyright 2017 The Author(s). Licensed under Creative Commons Attribution 4.0 International License (CC BY 4.0) (http://creativecommons.org/licenses/by/4.0/)

Repository Status

  • Open

Socio-economic Objectives

Barley

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