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Identifications of two different mechanisms for sorghum midge resistance through QTL mapping

Tao, Y.Z. and Hardy, A. and Drenth, J. and Henzell, R.G. and Franzmann, B.A. and Jordan, D.R. and Butler, D.G. and McIntyre, C.L. (2003) Identifications of two different mechanisms for sorghum midge resistance through QTL mapping. TAG Theoretical and Applied Genetics, 107 (1). pp. 116-122.

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Article Link(s): http://dx.doi.org/10.1007/s00122-003-1217-0

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

Abstract

Sorghum midge is the one of the most damaging insect pests of grain sorghum production worldwide. At least three different mechanisms are involved in midge resistance. The genetic bases of these mechanisms, however, are poorly understood. In this study, for the first time, quantitative trait loci associated with two of the mechanisms of midge resistance, antixenosis and antibiosis, were identified in an RI (recombinant inbred) population from the cross of sorghum lines ICSV745 2 90562.

Two genetic regions located on separate linkage groups were found to be associated with antixenosis and explained 12% and 15%, respectively, of the total variation in egg numbers/spikelet laid in a cage experiment. One region was significantly associated with antibiosis and explained 34.5% of the variation of the difference of egg and pupal counts in the RI population. The identification of genes for different mechanisms of midge resistance will be particularly useful for exploring new sources of midge resistance and for gene pyramiding of different mechanisms for increased security in sorghum breeding through marker-assisted selection.

Item Type:Article
Business groups:Agri-Science, Crop and Food Science
Additional Information:© Springer-Verlag GmbH.
Keywords:Sorghum; midge resistance; QTL mapping; marker-assisted selection.
Subjects:Science > Biology > Genetics > Quantitative genetics (esp. Quantitative Trait Loci (QTL) articles)
Plant pests and diseases > Pest control and treatment of diseases. Plant protection > Organic plant protection. Biological control
Plant pests and diseases > Individual or types of plants or trees > Sorghum
Deposited On:19 Mar 2004
Last Modified:26 Oct 2011 04:24

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