Correlated evolution of self-incompatibility and clonal reproduction in Solanum (Solanaceae)

doi:10.1111/j.1469-8137.2006.01924.x

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Wiley InterScience

New Phytologist

Volume 173 Issue 2, Pages 415 - 421

Published Online: 8 Nov 2006

Published on behalf of the New Phytologist Trust

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Correlated evolution of self-incompatibility and clonal reproduction in Solanum (Solanaceae)

Mario Vallejo-Marín ^1,2 and Heath E. O'Brien ¹

¹ Biology Department, Duke University, Durham, NC 27708, USA; ² Present address: Department of Ecology & Evolutionary Biology, University of Toronto, 25 Willcocks Street, Toronto, Ontario M5S 3B2, Canada

Author for correspondence: Mario Vallejo-Marín Tel: (416) 978 5603 Fax: (416) 978 5878 Email: mvallejo@botany.utoronto.ca

KEYWORDS

asexual reproduction • mating system • phylogenetic analysis • reproductive assurance • self-compatibility • Solanaceae • Solanum

New Phytologist (2007) 173: 415–421

doi: 10.1111/j.1469-8137.2006.01924.x

ABSTRACT

•
It has been suggested that clonality provides reproductive assurance in cross-fertilizing species subject to pollen limitation, relieving one of the main selective pressures favoring the evolution of self-fertilization. According to this hypothesis, cross-fertilizing species subject to pollen limitation should often be clonal. Here, we investigated the association between clonality and a genetic mechanism enforcing outcrossing, self-incompatibility, in Solanum (Solanaceae).
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We collected self-incompatibility and clonality information on 87 species, and looked for an association between these two traits. To account for the contribution of shared evolutionary history to this association, we incorporated phylogenetic information from chloroplast (NADH dehydrogenase subunit F) sequence data.
•
We found that self-incompatibility is strongly associated with clonal reproduction: all self-incompatible species reproduce clonally, while the absence of clonality is widespread among self-compatible taxa. The observed correlation persists after taking into account shared phylogenetic history, assumptions about the evolutionary history of self-incompatibility, uncertainty associated with phylogeny estimation, and associations with life history (annual/perennial).
•
Our results are consistent with the hypothesis that clonality provides reproductive assurance, and suggest that the consequences of clonal growth in the evolution of plant reproductive strategies may be more significant than previously thought.

Received: 14 July 2006 Accepted: 22 September 2006

DIGITAL OBJECT IDENTIFIER (DOI)

10.1111/j.1469-8137.2006.01924.x About DOI