Genetic and physical analysis of a YAC contig spanning the fungal disease resistance locus Asc of tomato (Lycopersicon esculentum)

被引:16
作者
Mesbah, LA [1 ]
Kneppers, TJA [1 ]
Takken, FLW [1 ]
Laurent, P [1 ]
Hille, J [1 ]
Nijkamp, HJJ [1 ]
机构
[1] Free Univ Amsterdam, Bioctr Amsterdam, Inst Mol Biol Sci, Dept Genet, NL-1081 HV Amsterdam, Netherlands
来源
MOLECULAR AND GENERAL GENETICS | 1999年 / 261卷 / 01期
关键词
tomato; Alternaria stem canker; map-based cloning; physical mapping; recombination;
D O I
10.1007/s004380050940
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
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 Ase locus and a series of plants selected for recombination events around the Ase 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 Ase region is six times higher (123 kb/cM) than the average for the tomato genome. Furthermore, the Ase locus could be localised to a 91-kb fragment, thus paving the way for the cloning and identification of the Ase gene(s) by complementation.
引用
收藏
页码:50 / 57
页数:8
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