The evolution of huge Y chromosomes in Coccinia grandis and its sister, Coccinia schimperi.

ABSTRACT: Microscopically dimorphic sex chromosomes in plants are rare, reducing our ability to study them. One difficulty has been the paucity of cultivatable species pairs for cytogenetic, genomic and experimental work. Here, we study the newly recognized sisters Coccinia grandis and Coccinia schimperi, both with large Y chromosomes as we here show for Co. schimperi. We built genetic maps for male and female Co. grandis using a full-sibling family, inferred gene sex-linkage, and, with Co. schimperi transcriptome data, tested whether X- and Y-alleles group by species or by sex. Most sex-linked genes for which we could include outgroups grouped the X- and Y-alleles by species, but some 10% instead grouped the two species' X-alleles. There was no relationship betwee

SUBMITTER: Janousek B 

PROVIDER: S-EPMC8935295 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature