A physical map covering the nsv locus that confers resistance to Melon necrotic spot virus in melon (Cucumis melo L.)

Mónica Morales, Gisella Orjeda, Cristina Nieto, Hans Van Leeuwen, Amparo Monfort, Myriam Charpentier, Michel Caboche, Pere Arús, Pere Puigdomènech, Miguel A. Aranda, Catherine Dogimont, Abdelhafid Bendahmane, Jordi Garcia-Mas

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23 Scopus citations

Abstract

Melon necrotic spot virus (MNSV) is a member of the genus Carmovirus, which produces severe yield losses in melon and cucumber crops. The nsv gene is the only known natural source of resistance against MNSV in melon, and confers protection against all widespread strains of this virus. nsv has been previously mapped in melon linkage group 11, in a region spanning 5.9 cM, saturated with RAPD and AFLP markers. To identify the nsv gene by positional cloning, we started construction of a high-resolution map for this locus. On the basis of the two mapping populations, F2 and BC1, which share the same resistant parent PI 161375 (nsv/nsv), and using more than 3,000 offspring, a high-resolution genetic map has been constructed in the region around the nsv locus, spanning 3.2 cM between CAPS markers M29 and M132. The availability of two melon BAC libraries allowed for screening and the identification of new markers closer to the resistance gene, by means of BAC-end sequencing and mapping. We constructed a BAC contig in this region and identified the marker 52K20sp6, which co-segregates with nsv in 408 F2 and 2.727 BC1 individuals in both mapping populations. We also identified a single 100 kb BAC that physically contains the resistance gene and covers a genetic distance of 0.73 cM between both BAC ends. These are the basis for the isolation of the nsv recessive-resistance gene. © Springer-Verlag 2005.
Original languageAmerican English
Pages (from-to)914-922
Number of pages9
JournalTheoretical And Applied Genetics
DOIs
StatePublished - 1 Sep 2005
Externally publishedYes

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    Morales, M., Orjeda, G., Nieto, C., Van Leeuwen, H., Monfort, A., Charpentier, M., Caboche, M., Arús, P., Puigdomènech, P., Aranda, M. A., Dogimont, C., Bendahmane, A., & Garcia-Mas, J. (2005). A physical map covering the nsv locus that confers resistance to Melon necrotic spot virus in melon (Cucumis melo L.). Theoretical And Applied Genetics, 914-922. https://doi.org/10.1007/s00122-005-0019-y