Uncoupling of sexual reproduction from homologous recombination in homozygous Oenothera species.

ABSTRACT: Salient features of the first meiotic division are independent segregation of chromosomes and homologous recombination (HR). In non-sexually reproducing, homozygous species studied to date HR is absent. In this study, we constructed the first linkage maps of homozygous, bivalent-forming Oenothera species and provide evidence that HR was exclusively confined to the chromosome ends of all linkage groups in our population. Co-segregation of complementary DNA-based markers with the major group of AFLP markers indicates that HR has only a minor role in generating genetic diversity of this taxon despite its efficient adaptation capability. Uneven chromosome condensation during meiosis in Oenothera may account for restriction of HR. The use of plants with ancient chromosomal arm arrangement demon

SUBMITTER: Rauwolf U 

PROVIDER: S-EPMC3186113 | biostudies-literature | 2011 Jul

REPOSITORIES: biostudies-literature