Mapping of agronomic traits, disease resistance and malting quality in a wide cross of two-row barley cultivars

Goddard, Rachel, de Vos, Sarah, Steed, Andrew, Muhammed, Amal, Thomas, Keith, Griggs, David, Ridout, Christopher and Nicholson, Paul (2019) Mapping of agronomic traits, disease resistance and malting quality in a wide cross of two-row barley cultivars. PLOS ONE, 14 (7). e0219042. ISSN 1932-6203

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Abstract

Wide crosses between genetically diverged parents may reveal novel loci for crop improvement that are not apparent in crosses between elite cultivars. The landrace Chevallier was a noted malting barley first grown in 1820. To identify potentially novel alleles for agronomic traits, Chevallier was crossed with the modern malting cultivar NFC Tipple generating two genetically diverse recombinant inbred line populations. Genetic maps were produced using genotyping-by-sequencing and 384-SNP genotyping, and the populations were phenotyped for agronomic traits to allow the identification of quantitative trait loci (QTL). Within the semi-dwarf 1 (sdw1) region on chromosome 3H Chevallier conferred increased plant height and reduced tiller number, with QTL for these traits explaining 79.4% and 35.2% of the phenotypic variance observed, respectively. Chevallier was also associated with powdery mildew susceptibility, with a QTL on 1H accounting for up to 19.1% of the variance and resistance at this locus most likely resulting from an Mla variant from Tipple. Two novel QTL for physiological leaf spotting were identified on 3H and 7H, explaining up to 17.1% of the variance and with the Chevallier allele reducing symptom severity on 7H. Preliminary micromalting analysis was also undertaken to compare the malting characteristics of Chevallier and Tipple. Chevallier malt contained significantly lower levels of both α-amylase and wort β-glucan than Tipple malt, however no significant differences were observed for the remaining malting parameters measured. This suggests that the most obvious improvements in barley since the introduction of Chevallier are for agronomic traits such as height, yield and lodging resistance rather than for malting characteristics. Overall, our results demonstrate that this wide cross between Chevallier and Tipple may provide a source of novel QTL for barley breeding.

Item Type: Article
Additional Information: ** From PLOS via Jisc Publications Router ** History: collection 2019; received 07-02-2019; accepted 16-06-2019; epub 17-07-2019. ** Licence for this article: http://creativecommons.org/licenses/by/4.0/
Uncontrolled Keywords: Research Article, Biology and life sciences, Research and analysis methods
Divisions: Faculty of Health Sciences and Wellbeing > School of Nursing and Health Sciences
Related URLs:
SWORD Depositor: Publication Router
Depositing User: Publication Router
Date Deposited: 10 Mar 2020 12:22
Last Modified: 10 Mar 2020 12:22
URI: http://sure.sunderland.ac.uk/id/eprint/10970
ORCID for Rachel Goddard: ORCID iD orcid.org/0000-0001-7553-3889
ORCID for Keith Thomas: ORCID iD orcid.org/0000-0003-1197-7522
ORCID for Christopher Ridout: ORCID iD orcid.org/0000-0001-9287-938X

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