Genetic and physical localization of an anthracnose resistance gene in <Emphasis Type="Italic">Medicago truncatula</Emphasis> |
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Authors: | Shengming Yang Muqiang Gao Shweta Deshpande Shaoping Lin Bruce A Roe Hongyan Zhu |
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Institution: | (1) Department of Plant and Soil Sciences, University of Kentucky, Lexington, KY 40546, USA;(2) Advanced Center for Genome Technology, Department of Chemistry and Biochemistry, University of Oklahoma, Norman, OK 73109, USA |
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Abstract: | Anthracnose of alfalfa, caused by the fungal pathogen Colletotrichum trifolii, is one of the most destructive diseases of alfalfa worldwide. An improved understanding of the genetic and molecular mechanisms
underlying host resistance will facilitate the development of resistant alfalfa cultivars, thus providing the most efficient
and environmentally sound strategy to control alfalfa diseases. Unfortunately, cultivated alfalfa has an intractable genetic
system because of its tetrasomic inheritance and out-crossing nature. Nevertheless, the model legume Medicago truncatula, a close relative of alfalfa, has the potential to serve as a surrogate to map and clone the counterparts of agronomically
important genes in alfalfa—particularly, disease resistance genes against economically important pathogens. Here we describe
the high-resolution genetic and physical mapping of RCT1, a host resistance gene against C. trifolii race 1 in M. truncatula. We have delimited the RCT1 locus within a physical interval spanning ∼200 kb located on the top of M. truncatula linkage group 4. RCT1 is part of a complex locus containing numerous genes homologous to previously characterized TIR-NBS-LRR type resistance genes.
The result presented in this paper will facilitate the positional cloning of RCT1 in Medicago. |
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