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Identification of QTL for barley grain size


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Wang, J, Wu, X, Yue, W, Zhao, C ORCID: 0000-0001-8586-6206, Yang, J and Zhou, M ORCID: 0000-0003-3009-7854 2021 , 'Identification of QTL for barley grain size' , PeerJ, vol. 9 , pp. 1-16 , doi: 10.7717/peerj.11287.

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Background:Barley grain size is one of the key factors determining storage capacity during grain filling. Large, well-filled grains also have a high malt extract potential. Grain size is a complex quantitative trait and can be easily affected by environmental factors thus the identification of genes controlling the trait and the use of molecular markers linked to the genes in breeding program is the most effective way of improving grain size.Methods:Grain sizes of 188 doubled-haploid (DH) lines derived from the cross of a Japanese malting barley variety (Naso Nijo) and a Chinese feed barley variety (TX9425) were obtained from three different sites in two consecutive years. The average data were used for identifying QTL for grain size.Results:A total of four significant QTL were identified for grain length (GL) and three for grain width (GW). The two major GL QTL are located at similar positions to the QTL for malt extract on 2H and uzu gene on 3H, respectively. However, the GL QTL on 2H is more likely a different one from the malt extract QTL as most of the candidate genes are located outside the fine mapped QTL region for malt extract. The GL QTL on 3H is closely linked with uzu gene but not due to a pleiotropic effect of uzu. The three QTL for grain width on 1H, 2H and 5H, respectively, were located at same position to those for GL.

Item Type: Article
Authors/Creators:Wang, J and Wu, X and Yue, W and Zhao, C and Yang, J and Zhou, M
Keywords: barley (Hordeum vulgare L.), grain size, quantitative trait loci, molecular marker
Journal or Publication Title: PeerJ
Publisher: PeerJ, Ltd
ISSN: 2167-8359
DOI / ID Number: 10.7717/peerj.11287
Copyright Information:

Copyright 2021 Wang et al. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0)

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