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Patterns and Mechanisms of Evolution of Island Plants

Kim, Seung-Chul [1].

Genetic architecture of species differences in the woody Sonchus alliance in the Canary Islands.

Adaptive radiation is perhaps the most widespread form of speciation on oceanic islands. Numerous molecular phylogenetic studies of adaptive radiation in several archipelagoes have been carried out to infer the history of organismal evolution and to understand the underlying evolutionary processes. However, we know very little about the genetic basis of species differences in relation to adaptive radiation in island settings. In this study, the genetic architecture of species differences and adaptive radiation was investigated using the woody Sonchus alliance (Asteraceae: Lactuceae) in the Canary Islands. Two allopatric but closely related species, Sonchus radicatus and Lactucosonchus webbii, were crossed and a backcross mapping population was generated. Sonchus radicatus is a woody perennial and primarily occurs in coastal ancient basal cliffs. In contrast, Lactucosonchus webbii is an herbaceous perennial and occurs in the understory of pine forest. The genetic linkage map was constructed based on AFLP markers and QTL analysis of morphological, life history, and ecophysiological traits were carried out. The number and magnitude of effects of genes controlling morphological, life history, and ecophysiological trait differences involved in adaptive radiation will be discussed.

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1 - University of California, Botany and Plant Sciences, Riverside, California, 92521, USA

Adaptive radiation
woody Sonchus alliance
genetics of species differences.

Presentation Type: Symposium or Colloquium Presentation
Session: 50-5
Location: Salon J - Austin Grand Ballroom/Hilton
Date: Wednesday, August 17th, 2005
Time: 4:00 PM
Abstract ID:354

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