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Fine Genetic Mapping And BAC Contig Development For The Citrus Tristeza Virus Resistance Gene Locus In Poncirus Trifoliata (Raf.)

Z. Deng, S. Huang, P. Ling, C. Yu, Q. Tao, C. Chen, M. Wendell, H-B. Zhang, F. Gmitter Jr.
Published 2001 · Biology, Medicine

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Abstract. A map-based cloning strategy has been employed to isolate Ctv, a single dominant gene from Poncirus trifoliata that confers resistance to citrus tristeza virus (CTV), the most important viral pathogen of citrus. Cloning of this gene will allow development of commercially acceptable, virus-resistant cultivars. A high-resolution genetic linkage map of the Ctv locus region was developed using a backcross population of 678 individuals. Three DNA markers that were closely linked or co-segregated with Ctv were identified and used to screen BAC libraries derived from an intergeneric hybrid of Poncirus and Citrus. Through chromosome walking and landing, two BAC contigs were developed: one encompassing the Ctv region, and the other spanning the allelic susceptibility gene region. The resistance gene contig consists of 20 BAC clones and is approximately 550 kb in length; the susceptibility gene contig consists of 16 BAC clones and extends about 450 kb. The Ctv locus was localized within a genomic region of approximately 180 kb by genetic mapping of BAC insert ends. The BAC contigs were integrated with the genetic map; variation in the ratio of genetic to physical distance was observed in the vicinity of Ctv. Southern hybridization data indicated that a few copies of NBS-LRR class sequences are distributed at or around the Ctv locus. Efforts are being made to assign the Ctv locus to a smaller genomic fragment whose function can be confirmed through genetic complementation of a CTV susceptible phenotype. These results indicate that map-based gene cloning is feasible in a woody perennial.



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