期刊
MOLECULAR BIOLOGY AND EVOLUTION
卷 36, 期 9, 页码 2029-2039出版社
OXFORD UNIV PRESS
DOI: 10.1093/molbev/msz141
关键词
recombination landscape; natural variation; climate conditions; domestication
资金
- German Federal Ministry of Education and Research [BMBF-FKZ 031B0188]
- IPK Gatersleben
- BMBF [FKZ 031B0190]
- Pakt fur Forschung und Innovation [SAW2015-IPK-1]
Meiotic recombination generates genetic diversity upon which selection can act. Recombination rates are highly variable between species, populations, individuals, sexes, chromosomes, and chromosomal regions. The underlying mechanisms are controlled at the genetic and epigenetic level and show plasticity toward the environment. Environmental plasticity may be divided into short- and long-term responses. We estimated recombination rates in natural populations of wild barley and domesticated landraces using a population genetics approach. We analyzed recombination landscapes in wild barley and domesticated landraces at high resolution. In wild barley, high recombination rates are found in more interstitial chromosome regions in contrast to distal chromosome regions in domesticated barley. Among subpopulations of wild barley, natural variation in effective recombination rate is correlated with temperature, isothermality, and solar radiation in a nonlinear manner. A positive linear correlation was found between effective recombination rate and annual precipitation. We discuss our findings with respect to how the environment might shape effective recombination rates in natural populations. Higher recombination rates in wild barley populations subjected to specific environmental conditions could be a means to maintain fitness in a strictly inbreeding species.
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