Saturation mapping of the apple scab resistance gene Vf using AFLP markers |
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Authors: | M L Xu S S Korban |
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Institution: | (1) Department of Natural Resources and Environmental Sciences, University of Illinois, 310 Madigan Building, 1201 West Gregory Drive, Urbana, IL 61801, USA Fax: +1-217-333-8298, e-mail: s-korban@uiuc.edu, US |
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Abstract: | Using the amplified fragment length polymorphism (AFLP) technique combined with a ”narrow-down” bulk segregant strategy enabled
us to quickly identify 15 tightly linked AFLP markers to the Vf gene that confers resistance to the apple scab disease. High-resolution mapping placed all 15 AFLP markers within an interval
of 0.6 cM around the Vf region; 7 of them were found to be inseparable from the Vf gene, 1 was localized left of, and the remaining 7 located right of the Vf gene. In addition, eight previously identified RAPD markers were also mapped, but only three, including M18, AM19, and AL07,
were localized within this short interval, and none co-segregated with the Vf gene. The saturation of the Vf region with AFLP markers will accelerate both marker-assisted selection and map-based cloning. The advantages of this ”narrow-down”
strategy, estimation of physical distances among AFLP markers, and their potential application are also discussed.
Received: 22 December 1999 / Accepted: 25 March 2000 |
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Keywords: | Apple Scab resistance Mapping Vf gene AFLP marker |
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