Unknown

Dataset Information

0

Evidence for Adaptive Introgression of Disease Resistance Genes Among Closely Related Arabidopsis Species.


ABSTRACT: The generation and maintenance of functional variation in the pathogen defense system of plants is central to the constant evolutionary battle between hosts and parasites. If a species is susceptible to a given pathogen, hybridization and subsequent introgression of a resistance allele from a related species can potentially be an important source of new immunity and is therefore expected to be selected for in a process referred to as adaptive introgression. Here, we survey sequence variation in 10 resistance (R-) genes and compare them with 37 reference genes in natural populations of the two closely related and interfertile species: Arabidopsis lyrata and A. halleri The R-genes are highly polymorphic in both species and show clear signs of trans-species polymorphisms. We show that A. lyrata and A. halleri have had a history of limited introgression for the reference genes. For the R-genes, the introgression rate has been significantly higher than for the reference genes, resulting in fewer fixed differences between species and a higher sharing of identical haplotypes. We conclude that R-genes likely cross the species boundaries at a higher rate than reference genes and therefore also that some of the increased diversity and trans-specific polymorphisms in R-genes is due to adaptive introgression.

SUBMITTER: Bechsgaard J 

PROVIDER: S-EPMC5555472 | biostudies-literature | 2017 Aug

REPOSITORIES: biostudies-literature

altmetric image

Publications

Evidence for Adaptive Introgression of Disease Resistance Genes Among Closely Related <i>Arabidopsis</i> Species.

Bechsgaard Jesper J   Jorgensen Tove Hedegaard TH   Schierup Mikkel Heide MH  

G3 (Bethesda, Md.) 20170807 8


The generation and maintenance of functional variation in the pathogen defense system of plants is central to the constant evolutionary battle between hosts and parasites. If a species is susceptible to a given pathogen, hybridization and subsequent introgression of a resistance allele from a related species can potentially be an important source of new immunity and is therefore expected to be selected for in a process referred to as adaptive introgression. Here, we survey sequence variation in  ...[more]

Similar Datasets

| S-EPMC3523012 | biostudies-literature
| S-EPMC4478293 | biostudies-literature
2008-11-20 | GSE9513 | GEO
| S-EPMC5824843 | biostudies-literature
| S-EPMC3380824 | biostudies-literature
| S-EPMC2650150 | biostudies-literature
| S-EPMC5575156 | biostudies-literature
| S-EPMC3435168 | biostudies-literature
| S-EPMC6509375 | biostudies-literature
| S-EPMC3194868 | biostudies-literature