Abstract Detail

Reproductive Processes

Popecki, Margot [1], Harkess, Alex [2], Kanno, Akira [3], Norup, Maria [5], Petersen, Gitte [4], Seberg, Ole [5], Leebens-Mack, Jim [6].

Mating system and sex chromosome evolution in the genus Asparagus L.

Most species in the genus Asparagus L. produce perfect flowers, but garden asparagus (A. officinalis L.) and its closest wild relatives are known to be dioecious. Robust inference of the phylogenetic distribution of dioecy in the Asparagus L. phylogeny has been lacking due to limited taxon and/or gene sampling. Analysis of 254 single copy gene trees provides strong evidence for at least two dioecious lineages in the genus, implying parallel evolution of dioecy or a reversal from dioecy to hermaphroditism. Whereas recent genomic and functional investigations of dioecious garden asparagus have revealed that sex determination is driven by at least two Y-specific genes, SUPPRESSOR OF FEMALE FUNCTION (SOFF) and TAPETAL DEVELOPMENT AND FUNCTION 1(aspTDF1), the identity of sex determination genes is not known for most dioecious Asparagus species. Whole genome shotgun sequence reads are being analyzed to assess the diversity and evolution of SOFF and aspTDF1 homologs in dioecious and close related hermaphrodite Asparagus species.

1 - University of Georgia , Athens, GA, USA
2 - Donald Danforth Plant Science Center, 975 N Warson Rd, St. Louis, MO, 63132, United States
3 - Tohoku University, Sendai, Miyagi, Japan
4 - Stockholm University, Stockholm, Sweden
5 - University of Copenhagen, Copenhagen, Denmark
6 - University Of Georgia, Plant Biology, 2101 Miller Plant Sciences, Athens, GA, 30602, United States

Sex Chromosomes

Presentation Type: Oral Paper
Number: 0005
Abstract ID:794
Candidate for Awards:None

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