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A single locus is responsible for salinity tolerance in a Chinese landrace barley (Hordeum vulgare L.)

Ingvarsson, P.K., Xu, R., Wang, J., Li, C., Johnson, P., Lu, C. and Zhou, M. (2012) A single locus is responsible for salinity tolerance in a Chinese landrace barley (Hordeum vulgare L.). PloS one, 7 (8). e43079.

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Salinity and waterlogging are two major abiotic stresses severely limiting barley production. The lack of a reliable screening method makes it very hard to improve the tolerance through breeding programs.

This work used 188 DH lines from a cross between a Chinese landrace variety, TX9425 (waterlogging and salinity tolerant), and a Japanese malting barley, Naso Nijo (waterlogging and salinity sensitive), to identify QTLs associated with the tolerance.

Four QTLs were found for waterlogging tolerance. The salinity tolerance was evaluated with both a hydroponic system and in potting mixture. In the trial with potting mixture, only one major QTL was identified to associate with salinity tolerance. This QTL explained nearly 50% of the phenotypic variation, which makes it possible for further fine mapping and cloning of the gene. This QTL was also identified in the hydroponic experiment for different salt-related traits. The position of this QTL was located at a similar position to one of the major QTLs for waterlogging tolerance, indicating the possibility of similar mechanisms controlling both waterlogging and salinity tolerance.

The markers associated with the QTL provided a unique opportunity in breeding programs for selection of salinity and waterlogging tolerance.

Publication Type: Journal Article
Publisher: Public Library of Science
Copyright: © 2012 Xu et al.
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