Affiliation:
1. Department of Molecular Biology, Max Planck Institute for Biology , 72076 Tübingen , Germany
2. Department of Botany, Faculty of Science, Charles University , 128 01 Prague , Czech Republic
Abstract
Abstract
In this study, we aimed to systematically assess the frequency at which potentially deleterious phenotypes appear in natural populations of the outcrossing model plant Arabidopsis arenosa, and to establish their underlying genetics. For this purpose, we collected seeds from wild A. arenosa populations and screened over 2,500 plants for unusual phenotypes in the greenhouse. We repeatedly found plants with obvious phenotypic defects, such as small stature and necrotic or chlorotic leaves, among first-generation progeny of wild A. arenosa plants. Such abnormal plants were present in about 10% of maternal sibships, with multiple plants with similar phenotypes in each of these sibships, pointing to a genetic basis of the observed defects. A combination of transcriptome profiling, linkage mapping and genome-wide runs of homozygosity patterns using a newly assembled reference genome indicated a range of underlying genetic architectures associated with phenotypic abnormalities. This included evidence for homozygosity of certain genomic regions, consistent with alleles that are identical by descent being responsible for these defects. Our observations suggest that deleterious alleles with different genetic architectures are segregating at appreciable frequencies in wild A. arenosa populations.
Funder
ERC Advanced Grant IMMUNEMESIS
Deutsche Forschungsgemeinschaft
Collaborative Research Center 1101
Max Planck Society
Czech Science Foundation
Publisher
Oxford University Press (OUP)
Subject
Genetics (clinical),Genetics,Molecular Biology
Cited by
2 articles.
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