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]
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.
|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|
|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)|
|Web of Science® Times Cited:||2|
|Deposited By:||Tasmanian Institute of Agriculture|
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