ISSN:
1617-4623
Keywords:
Key words Tomato
;
Alternaria stem canker
;
Map-based cloning
;
Physical mapping
;
Recombination
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract The Alternaria stem canker disease of tomato is caused by the necrotrophic fungal pathogen Alternaria alternata f. sp. lycopersici (AAL). The fungus produces AAL toxins that kill the plant tissue. Resistance to the fungus segregates as a single locus, called Asc, and has been genetically mapped on chromosome 3 of tomato. We describe here the establishment of a 1383-kb YAC contig covering the Asc locus and a series of plants selected for recombination events around the Asc locus. It was shown that the YAC contig corresponds to a genetic distance of at least 11.2 cM. Thus, the recombination rate in the Asc region is six times higher (123 kb/cM) than the average for the tomato genome. Furthermore, the Asc locus could be localised to a 91-kb fragment, thus paving the way for the cloning and identification of the Asc gene(s) by complementation.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s004380050940
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