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Abstract Detail

Evolution on Islands: a colloquium to honor the careers of Daniel Crawford and Tod Stuessy

Archibald, Jenny [1], Soto-Trejo, Fabiola [2], Mort, Mark [3], Kelly, John [4], Santos-Guerra, Arnoldo [5], Crawford, Daniel [6].

The Evolution of Self-Compatibility and Associated Floral Characters in Tolpis(Asteraceae) in the Canary Islands.

Members of the genus Tolpis(Asteraceae) endemic to the Canary Islands comprise a monophyletic group with the dispersal of one species to the Cape Verde Islands. Most species are self-incompatible (SI) orpseudo-self-compatible (PSC) perennials. However, one species, T. coronopifolia , consists of self-compatible (SC) annual plants with several floral features typical of the selfing syndrome. The evolution of SC and the selfing syndrome was studied by producing synthetic hybrids between SI-PSC and SC plants to determine the genetic architecture of breeding system and floral trait differences. There was co-segregation for SC and selfing floral traits in the F2 generation. Self-incompatibility in Tolpisis controlled by a locus of major effect, but there appear to be modifier loci affecting seed set. Segregation of floral traits indicates that they are controlled by multiple loci. The high molecular similarity between plants with the two breeding systems suggests that divergence of the SC T. coronopifolia from SI-PSC ancestors hasbeen recent. The co-segregation of breeding system and floral features likely results from pleiotropy or close linkage and may have facilitated the rapid evolution of the morphologically distinct SC T. coronopifolia .

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1 - University Of Kansas, RL McGregor Herbarium & Bridwell Botanical Research Lab, 2045 Constant Ave, Lawrence, KS, 66047-3729, USA
2 - University of Kansas, Biodiversity Institute, Lawrence, KS, 66045, USA
3 - University Of Kansas, Ecology and Evolutionary Biology & Biodiversity Institute, 1200 Sunnyside Avenue, Lawrence, KS, 66045, USA
4 - University of Kansas, Ecology and Evolutionary Biology, 1200 Sunnyside Avenue, Lawrence, KS, 66045, USA
5 - Unidad de Botánica (ICIA) , Puerto de la Cruz, Tenerife, Spain
6 - University Of Kansas, Department Of Ecology And Evolutionary Biology, 1200 Sunnyside Avenue, Haworth Hall, Lawrence, KS, 66045-7534, USA

Canary Islands

Presentation Type: Symposium or Colloquium Presentation
Session: C5
Location: Franklin A/Hyatt
Date: Wednesday, July 11th, 2012
Time: 11:00 AM
Number: C5010
Abstract ID:309

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