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Genetics of Adaptation pp 171–179Cite as

Hybridization as a source of evolutionary novelty: leaf shape in a Hawaiian composite

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Part of the book series: Georgia Genetics Review III ((GEGR,volume 3))

Abstract

Hybridization is increasingly recognized as a significant creative force in evolution. Interbreeding among species can lead to the creation of novel genotypes and morphologies that lead to adaptation. On the Hawaiian island of O’ahu, populations of two species of plants in the endemic genus Lipochaeta grow at similar elevations in the northern Wai’anae Mountains. These two species represent extremes of the phenotypic distribution of leaf shape: the leaves of Lipochaeta tenuifolia individuals are compound and highly dissected while leaves of L. tenuis are simple. Based primarily on leaf shape morphology, a putative hybrid population of Lipochaeta located at Pu’u Kawiwi was identified. Individuals in this population exhibit a range of leaf shapes intermediate in varying degrees between the leaf shapes of the putative parental species. We analyzed individuals from pure populations of L. tenuifolia, L. tenuis and the putative hybrids using 133 AFLP markers. Genetic analysis of these neutral markers provided support for the hybrid origin of this population. The correlation between genetic background and leaf morphology in the hybrids suggested that the genome of the parental species with simple leaves might have significantly contributed to the evolution of a novel, compound leaf morphology.

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Authors and Affiliations

  1. Department of Geography, University of Georgia, Athens, GA, 30602, USA

    Stacy Jørgensen

  2. Department of Genetics, University of Georgia, Athens, GA, 30602, USA

    Rodney Mauricio

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  1. Stacy Jørgensen
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  2. Rodney Mauricio
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Correspondence to Stacy Jørgensen .

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Rodney Mauricio

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Jørgensen, S., Mauricio, R. (2005). Hybridization as a source of evolutionary novelty: leaf shape in a Hawaiian composite. In: Mauricio, R. (eds) Genetics of Adaptation. Georgia Genetics Review III, vol 3. Springer, Dordrecht. https://doi.org/10.1007/1-4020-3836-4_15

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