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A major QTL controlling the tolerance to manganese toxicity in barley (Hordeum vulgare L.)

Huang, X ORCID: 0000-0003-4995-9784, Fan, Y, Shabala, L ORCID: 0000-0002-5360-8496, Rengel, Z and Zhou, MX ORCID: 0000-0003-3009-7854 2018 , 'A major QTL controlling the tolerance to manganese toxicity in barley (Hordeum vulgare L.)' , Molecular Breeding, vol. 38, no. 2 , pp. 1-9 , doi: 10.1007/s11032-017-0767-9.

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Abstract

Waterlogging stress disturbs plant metabolism through increased ion (manganese and iron) toxicity resulting from the changes in the soil redox potential under hypoxic conditions. Our previous study found a significant correlation between the tolerance to Mn2+ toxicity and waterlogging stress tolerance in barley, suggesting that waterlogging tolerance could be increased by improving the tolerance to Mn2+ toxicity. In this study, a doubled-haploid (DH) population from the cross between barley varieties Yerong and Franklin (waterlogging-tolerant and -sensitive, respectively) was used to identify QTL controlling tolerance to Mn2+ toxicity based on chlorophyll content and plant survival as selection criteria. Four significant QTL for plant survival under Mn2+ stress (QSur.yf.1H, QSur.yf.3H, QSur.yf.4H, and QSur.yf.6H) were identified in this population at the seedling stage. Two significant QTL (QLC.yf.3H and QLC.yf.6H) controlling leaf chlorosis under Mn2+ stress were identified on chromosomes 3H and 6H close to QSur.yf.3H and QSur.yf.6H. The major QTL QSur.yf.3H, located near the marker Bmag0013, explained 21% of the phenotypic variation. The major QTL for plant survival on 3H was validated in a different DH population (TX9425/Naso Nijo). This major QTL could potentially be used in breeding programmes to enhance tolerance to both manganese toxicity and waterlogging.

Item Type: Article
Authors/Creators:Huang, X and Fan, Y and Shabala, L and Rengel, Z and Zhou, MX
Keywords: barley (Hordeum vulgare L.), Mn2+ toxicity, waterlogging tolerance, QTL mapping
Journal or Publication Title: Molecular Breeding
Publisher: Kluwer Academic Publ
ISSN: 1380-3743
DOI / ID Number: 10.1007/s11032-017-0767-9
Copyright Information:

Copyright 2018 Springer Science+Business Media B.V., part of Springer Nature

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