Abstract
Pear scab (caused by Venturia nashicola) is one of the most harmful diseases of pears, especially Japanese and Chinese pear species. The molecular identification and early selection of resistant plants could greatly improve pear breeding. We have identified the position of the scab resistance gene, designated Vnk in an indigenous Japanese pear cultivar Kinchaku, within the pear genome by using simple sequence repeat (SSR) markers derived from pear and apple. The position of Vnk was identified in the central region of linkage group 1 of Kinchaku. Several amplified fragment length polymorphism (AFLP) markers linked to Vnk were obtained by bulked segregant analysis. Among them, the AFLP marker closest to Vnk was converted into a sequence tagged site (STS) marker. Four random amplified polymorphic DNA (RAPD) markers previously found to be loosely associated with Vnk (Iketani et al. 2001) were successfully converted into STS markers. Six markers (one SSR Hi02c07 and five STSs converted from AFLP and RAPD) showed tight linkages to Vnk, being mapped with distances ranging from 2.4 to 12.4 cM. The SSR CH-Vf2, which was isolated from a BAC clone of the contig containing the apple scab gene Vf, was mapped at the bottom of linkage group 1 in Kinchaku, suggesting that the Vnk and Vf loci are located in different genomic regions of the same homologous linkage group.
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Acknowledgments
Contribution No. 1424 of the National Institute of Fruit Tree Science. We thank Drs. N. Matsuta, T. Kimura, and C. Nishitani for their valuable suggestions, and Ms. T. Iida for her technical assistance.
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Terakami, S., Shoda, M., Adachi, Y. et al. Genetic mapping of the pear scab resistance gene Vnk of Japanese pear cultivar Kinchaku. Theor Appl Genet 113, 743–752 (2006). https://doi.org/10.1007/s00122-006-0344-9
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DOI: https://doi.org/10.1007/s00122-006-0344-9