Adaptive traits to improve durum wheat yield in drought and crown rot environments

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dc.contributor.authorAlahmad, S.
dc.contributor.authorKang, Y.
dc.contributor.authorDinglasan, E.
dc.contributor.authorMazzucotelli, E.
dc.contributor.authorVoss-Fels, K.P.
dc.contributor.authorAble, J.A.
dc.contributor.authorChristopher, J.
dc.contributor.authorBassi, F.M.
dc.contributor.authorHickey, L.T.
dc.date.issued2020
dc.description.abstractDurum wheat (Triticum turgidum L. ssp. durum) production can experience significant yield losses due to crown rot (CR) disease. Losses are usually exacerbated when disease infection coincides with terminal drought. Durum wheat is very susceptible to CR, and resistant germplasm is not currently available in elite breeding pools. We hypothesize that deploying physiological traits for drought adaptation, such as optimal root system architecture to reduce water stress, might minimize losses due to CR infection. This study evaluated a subset of lines from a nested association mapping population for stay-green traits, CR incidence and yield in field experiments as well as root traits under controlled conditions. Weekly measurements of normalized difference vegetative index (NDVI) in the field were used to model canopy senescence and to determine stay-green traits for each genotype. Genome-wide association studies using DArTseq molecular markers identified quantitative trait loci (QTLs) on chromosome 6B (qCR-6B) associated with CR tolerance and stay-green. We explored the value of qCR-6B and a major QTL for root angle QTL qSRA-6A using yield datasets from six rainfed environments, including two environments with high CR disease pressure. In the absence of CR, the favorable allele for qSRA-6A provided an average yield advantage of 0.57 t·ha−1, whereas in the presence of CR, the combination of favorable alleles for both qSRA-6A and qCR-6B resulted in a yield advantage of 0.90 t·ha−1. Results of this study highlight the value of combining above- and belowground physiological traits to enhance yield potential. We anticipate that these insights will assist breeders to design improved durum varieties that mitigate production losses due to water deficit and CR.
dc.description.statementofresponsibilitySamir Alahmad, Yichen Kang, Eric Dinglasan, Elisabetta Mazzucotelli, Kai P. Voss-Fels, Jason A. Able, Jack Christopher, Filippo M. Bassi and Lee T. Hickey
dc.identifier.citationInternational Journal of Molecular Sciences, 2020; 21(15):1-17
dc.identifier.doi10.3390/ijms21155260
dc.identifier.issn1661-6596
dc.identifier.issn1422-0067
dc.identifier.orcidAble, J.A. [0000-0003-3207-6301]
dc.identifier.urihttp://hdl.handle.net/2440/128470
dc.language.isoen
dc.publisherMDPI
dc.relation.granthttp://purl.org/au-research/grants/arc/DE170101296
dc.rights© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
dc.source.urihttps://doi.org/10.3390/ijms21155260
dc.subjectDrought adaptation; fusarium; stay-green; root architecture; association mapping; water use
dc.titleAdaptive traits to improve durum wheat yield in drought and crown rot environments
dc.typeJournal article
pubs.publication-statusPublished

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