Comparing the linkage maps of the close relatives Arabidopsis lyrata and A. thaliana.
We have constructed a genetic map of Arabidopsis lyrata, a self-incompatible relative of the plant model species A. thaliana. A. lyrata is a diploid (n = 8) species that diverged from A. thaliana (n = 5) approximately 5 MYA. Mapping was conducted in a full-sib progeny of two unrelated F(1) hybrids between two European populations of A. lyrata ssp. petraea. We used the least-squares method of the Joinmap program for map construction. The gross chromosomal differences between the two species were most parsimoniously explained with three fusions, two reciprocal translocations, and one inversion. The total map length was 515 cM, and the distances were 12% larger than those between corresponding markers in the linkage map of A. thaliana. The 72 markers, consisting of microsatellites and gene-based markers, were spaced on average every 8 cM. Transmission ratio distortion was extensive, and most distortions were specific to each reciprocal cross, suggesting cytoplasmic interactions. We estimate locations and most probable genotype frequencies of transmission ratio distorting loci (TRDL) with a Bayesian method and discuss the possible reasons for the observed distortions.
Kuittinen
Helmi
H
Department of Biology, University of Oulu, 90401 Oulu, Finland. helmi.kuittinen@oulu.fi
de Haan
Anita A
AA
Vogl
Claus
C
Oikarinen
Sami
S
Leppälä
Johanna
J
Koch
Marcus
M
Mitchell-Olds
Tom
T
Langley
Charles H
CH
Savolainen
Outi
O
D017360:Arabidopsis / Q000235:genetics*; D005075:Biological Evolution; D002874:Chromosome Mapping; D003433:Crosses, Genetic; D008040:Genetic Linkage; D005819:Genetic Markers; D014178:Translocation, Genetic
D005819:Genetic Markers