Genetic structure of wild bean populations in their South-Andean centre of origin

被引:47
作者
Cattan-Toupance, I
Michalakis, Y
Neema, C [1 ]
机构
[1] Univ Paris Sud, Inst Biotechnol Plantes, Lab Phytopathol Mol, F-91405 Orsay, France
[2] Univ Paris 06, CNRS, Ecol Lab, F-75252 Paris 05, France
关键词
common bean; anthracnose resistance; RAPD; genetic structure; centre of origin;
D O I
10.1007/s001220050811
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
The genetic structure of wild common bean populations was studied in the South-Andean centre of origin of the species. Plants were collected from 21 populations in Argentina and genetic variability was assessed for molecular and resistance markers. Polymorphism was weak for phaseolin, the major seed-storage protein, and for RAPD markers, while a high level of polymorphism was observed for resistance to anthracnose, one of the most important diseases of common bean. For the three traits, within-population variability was important and represented between 43.6% and 67.5% of the total variation. Although among-population differentiation was significant for all the traits, no correlation was found between the population distances calculated from RAPDs and resistance. These results indicate that pathogen selection pressure may be an important factor influencing the distribution of variability within and among host plant populations.
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页码:844 / 851
页数:8
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