期刊
JOURNAL OF HEREDITY
卷 101, 期 -, 页码 S107-S117出版社
OXFORD UNIV PRESS INC
DOI: 10.1093/jhered/esq001
关键词
allopolypoidy; dioecy; Fragaria; male sterility; sex chromosome evolution
资金
- Cooperative State Research, Education, and Extension Service National Research Initiative of the United States Department of Agriculture [2005-00765]
- National Science Foundation [DEB-0449488]
Recent evolution of separate sexes in flowering plants provides unparalleled opportunities for understanding the early stages of sex chromosome evolution, including their origin from autosomes. Moreover, the transition from combined to separate sexes can be associated with speciation via polyploidization in angiosperms, suggesting that genome doubling/merger may facilitate sterility mutations required for sex chromosome formation. To gain insight into the origin of sex chromosomes in a polyploid plant, we doubled the simple sequence repeat (SSR) density and increased genome coverage in a genetic map of octoploid Fragaria virginiana, a species purported to have a proto-sex chromosome, where limited recombination occurs between 2 linked loci carrying the male-and female-sterility mutations. Incorporation of almost 3 times the number of SSR markers into the current map facilitated complete characterization of the F. virginiana proto-sex chromosome, revealing its largely autosomal nature and the location of the sex-determining region toward the distal end. Furthermore, extensive synteny between our genetic map and a map involving diploid hermaphroditic congeners allowed assignment of linkage groups to homeologous groups, identification of the proto-sex chromosome's autosomal homoeolog, and detection of a putative rearrangement near the sex-determining region. Fine mapping and additional comparative work will shed light on the intriguing possibility that rearrangements during polyploidization were involved in the evolution of sex chromosomes in Fragaria.
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