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

Citation

Liu, X and Fan, Y and Mak, M and Babla, M and Holford, P and Wang, F and Chen, G and Scott, G and Wang, G and Shabala, S and Zhou, M and Chen, Z-H, QTLs for stomatal and photosynthetic traits related to salinity tolerance in barley, BMC Genomics, 18 Article 9. ISSN 1471-2164 (2017) [Refereed Article]


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DOI: doi:10.1186/s12864-016-3380-0

Abstract

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 9.517.3% 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.

Item Details

Item Type:Refereed Article
Keywords:gas exchange, guard cell, Hordeum vulgare L, QTL mapping, stomatal regulation
Research Division:Agricultural and Veterinary Sciences
Research Group:Crop and Pasture Production
Research Field:Crop and Pasture Improvement (Selection and Breeding)
Objective Division:Plant Production and Plant Primary Products
Objective Group:Winter Grains and Oilseeds
Objective Field:Barley
Author:Fan, Y (Miss Yun Fan)
Author:Wang, F (Miss Feifei Wang)
Author:Shabala, S (Professor Sergey Shabala)
Author:Zhou, M (Associate Professor Meixue Zhou)
ID Code:114280
Year Published:2017
Web of Science® Times Cited:2
Deposited By:Tasmanian Institute of Agriculture
Deposited On:2017-02-09
Last Modified:2017-11-16
Downloads:0

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