DNA variation in the wild plant Arabidopsis thaliana revealed by amplified fragment length polymorphism analysis.
Genetics
; 152(4): 1723-31, 1999 Aug.
Article
em En
| MEDLINE
| ID: mdl-10430596
ABSTRACT
To investigate the level and pattern of DNA variation of Arabidopsis thaliana at the entire genome level, AFLP analysis was conducted for 38 ecotypes distributed throughout the world. Ten pairs of selective primers were used to detect a total of 472 bands, of which 374 (79. 2%) were polymorphic. The frequency distribution of polymorphic bands was skewed toward an excess of singleton variation. On the basis of AFLP variation, nucleotide diversity for the entire genome was estimated to be 0.0106, which was within the range reported previously for specific nuclear genes. The frequency distribution of pairwise distance was bimodal because of an ecotype (Fl-3) with a large number of unique bands. Linkage disequilibrium between polymorphic AFLPs was tested. The proportion of significant linkage disequilibria was close to random expectation after neglecting the ecotype Fl-3. This result indicates that the effect of recombination could not be ignored in this selfing species. A neighbor-joining tree was constructed on the basis of the AFLP variation. This tree has a star-like topology and shows no clear association between ecotype and geographic origin, suggesting a recent spread of this plant species and limited migration between its habitats.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Arabidopsis
/
DNA de Plantas
Idioma:
En
Revista:
Genetics
Ano de publicação:
1999
Tipo de documento:
Article