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Abstract Detail


McDonnell, Angela [1], Loke, Elena [2], Moore, Michael [3], Sakai, Ann [4], Weller, Stephen [5], Wagner, Warren [6], Skogen, Krissa [7], Weisenberger, Lauren [8], Wickett, Norman [9].

New perspectives on the evolution of plant breeding systems in the radiation of Hawaiian Schiedea (Caryophyllaceae).

The evolution of island lineages provides outstanding opportunities to understand evolutionary processes affecting the diversification of species, plant reproductive systems, and pollination systems. Using  Schiedea  (Caryophyllaceae), the fifth-largest plant radiation in the Hawaiian Islands, our team has investigated genetic and ecological factors promoting separate sexes or autogamy and changes in pollination systems as species radiated into a variety of habitats. Hybridization and gene flow may also promote the evolution of separate sexes through introgression of male-sterility genes from gynodioecious or dioecious species into hermaphroditic species. We report on a custom probe kit for targeted sequencing of nuclear loci in the genus, and twelve transcriptomes that span the earliest estimated splits in the genus. These will help us resolve not only the phylogeny of Schiedea but also the number and relative timing of independent transitions to dioecy, the inference of which may be impacted by historical introgression, incomplete lineage sorting, and genome duplication throughout the genus. Complete genome sequences for three species will be used to support the inference of these processes, particularly the history of whole-genome duplication, and to estimate levels of genome-wide genetic diversity in a conservation context.

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1 - Chicago Botanic Garden, Science Dept., 1000 Lake Cook Road, Glencoe, IL, 60022, United States
2 - Chicago Botanic Garden, 1000 Lake Cook Rd, Glencoe, Illinois, 60022-1168, United States
3 - Oberlin College, Biology, Science Center K111, Oberlin, OH, 44074, USA
4 - Univ. California, Irvine, Dept Ecology & Evolutionary Biology, 321 Steinhaus Hall, Irvine, CA, 92697, United States
5 - University Of California, Department Of Ecology And Evolutionary Biology, 20 Gibbs Ct, Irvine, CA, 92617, United States
6 - Botany, MRC-166 National Museum Of Natural History, PO Box 37012, Washington, DC, 20013, United States
7 - 1000 Lake Cook Road, Glencoe, IL, 60022, United States
8 - U.S. Fish and Wildlife Service, Pacific Islands Fish and Wildlife Office, 300 Ala Moana Blvd, Honolulu, HI, 96850, USA
9 - Chicago Botanic Garden, 1000 Lake Cook Rd., Glencoe, IL, 60022, United States

Genome Assembly
Genome Duplication
Targeted enrichment
Probe design
Hawaiian Islands
Breeding system.

Presentation Type: Oral Paper
Session: PHYLOIV, Phylogenomics IV
Location: Virtual/Virtual
Date: Friday, July 23rd, 2021
Time: 1:00 PM(EDT)
Number: PHYLOIV003
Abstract ID:781
Candidate for Awards:None

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