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QTL analysis of ergot resistance in sorghum

Parh, D.K. and Jordan, D.R. and Aitken, E.A.B. and Mace, E.S. and Jun-Ai, P. and McIntyre, C.L. and Godwin, I.D. (2008) QTL analysis of ergot resistance in sorghum. TAG Theoretical and Applied Genetics, 117 (3). pp. 369-382.

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Article Link(s): http://dx.doi.org/10.1007/s00122-008-0781-8

Publisher URL: http://www.springerlink.com

Abstract

Sorghum ergot, caused predominantly by Claviceps africana Frederickson, Mantle, de Milliano, is a significant threat to the sorghum industry worldwide. The objectives of this study were firstly, to identify molecular markers linked to ergot resistance and to two pollen traits, pollen quantity (PQ) and pollen viability (PV), and secondly, to assess the relationship between the two pollen traits and ergot resistance in sorghum. A genetic linkage map of sorghum RIL population R931945-2-2 x IS 8525 (resistance source) was constructed using 303 markers including 36 SSR, 117 AFLP™, 148 DArT™ and two morphological trait loci. Composite interval mapping identified nine, five, and four QTL linked to molecular markers for percentage ergot infection (PCERGOT), PQ and PV, respectively, at a LOD >2.0. Co-location/linkage of QTL were identified on four chromosomes while other QTL for the three traits mapped independently, indicating that both pollen and non pollen-based mechanisms of ergot resistance were operating in this sorghum population. Of the nine QTL identified for PCERGOT, five were identified using the overall data set while four were specific to the group data sets defined by temperature and humidity. QTL identified on SBI-02 and SBI-06 were further validated in additional populations. This is the first report of QTL associated with ergot resistance in sorghum. The markers reported herein could be used for marker-assisted selection for this important disease of sorghum.

Item Type:Article
Corporate Creators:Department of Employment, Economic Development and Innovation (DEEDI), Agri-Science, Crop and Food Science, Plant Science
Business groups:Agri-Science, Crop and Food Science
Additional Information:© Springer-Verlag.
Keywords:Sorghum bicolor (L.) Moench; quantitative trait loci (QTL); diversity arrays technology; simple sequence repeats (SSRs); Arabidopsis thaliana; Claviceps africana; genomic regions; wild relatives; grain; genetic basis.
Subjects:Plant pests and diseases > Pest control and treatment of diseases. Plant protection > Organic plant protection. Biological control
Science > Biology > Genetics > Quantitative genetics (esp. Quantitative Trait Loci (QTL) articles)
Plant pests and diseases > Individual or types of plants or trees > Sorghum
Deposited On:02 Feb 2009 02:26
Last Modified:25 Oct 2011 23:28

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