Brazilian beak‑sedge reproduces sexually without genetic recombination, producing clones

A study published in *Nature* reveals that the Brazilian beak‑sedge (*Rhynchospora tenuis*) reproduces sexually yet forgoes the genetic reshuffling typical of meiosis. The research, conducted by an international team led by André Marques at the Max Planck Institute for Plant Breeding Research in Cologne, shows that while the plant produces pollen, fertilizes egg cells and forms seeds, it completely lacks crossover events between homologous chromosomes during gamete formation.

Genomic analyses of parent plants and their progeny demonstrated that the offspring inherit an exact copy of the maternal genome, with no contribution from the paternal DNA beyond the trigger for seed development. This absence of recombination results in progeny that are genetically identical to their mothers, effectively replicating the outcome of clonal propagation despite occurring through a sexual life cycle.

The findings challenge the conventional view that sexual reproduction inherently generates genetic diversity and suggest that some species may evolve mechanisms to retain the advantages of seed formation while bypassing the risks associated with recombination. The study expands understanding of plant reproductive strategies and may have implications for evolutionary biology and crop breeding research.