Molecular Biology and Evolution, Vol 14, 1303-1315, Copyright © 1997 by Society for Molecular Biology and Evolution
A Kawabe, H Innan, R Terauchi and NT Miyashita
To investigate DNA variation in natural plant populations, a 1.8-kb region
of the acidic chitinase locus (ChiA)was analyzed for 17 ecotypes of
Arabidopsis thaliana sampled worldwide and 3 Arabis species in Japan. As in
the Adh region, dimorphism was detected throughout the investigated ChiA
region, suggesting the possibility that dimorphic DNA variation exists in
the entire nuclear genome of A. thaliana. The ChiA region was divided into
two blocks by an intragenic recombination between two parental sequence
types, which diverged 7.4 MYA under the assumption that nucleotide mutation
rate per site per year is mu = 10(- 9). Nucleotide diversity in the entire
ChiA region was 0.0104. Tajima's test was significantly negative for both
nucleotide and indel variations, which was manifested as an excess of
unique polymorphisms. However, the level and pattern of polymorphism in the
ChiA region were inconsistent with simple theoretical explanations. The HKA
test detected no difference in the levels of intra- and interspecific
variations between the ChiA and Adh regions. In the ChiA coding region, no
difference in the patterns of synonymous and replacement variation was
found in intra- and interspecific comparisons by the MK test. Although it
was difficult to determine the exact genetic mechanism acting on the ChA
locus, these results suggested that the ChA locus region was under the same
genetic mechanism before and after the establishment of A. thaliana as a
species.
ORIGINAL ARTICLE
Nucleotide polymorphism in the acidic chitinase locus (ChiA) region of the wild plant Arabidopsis thaliana
Laboratory of Plant Genetics, Graduate School of Agriculture, Kyoto University, Japan.
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