Evolution of the sex-determining region in Ginkgo biloba.

ABSTRACT: Sex chromosomes or sex-determining regions (SDR) have been discovered in many dioecious plant species, including the iconic 'living fossil' Ginkgo biloba, though the location and size of the SDR in G. biloba remain contradictory. Here we resolve these controversies and analyse the evolution of the SDR in this species. Based on transcriptome sequencing data from four genetic crosses we reconstruct male- and female-specific genetic maps and locate the SDR to the middle of chromosome 2. Integration of the genetic maps with the genome sequence reveals that recombination in and around the SDR is suppressed in a region of about 50 Mb in both males and females. However, occasional recombination does occur except a small, less than 5 Mb long region that does not recombine in males. B

SUBMITTER: Gong W 

PROVIDER: S-EPMC8935300 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature