Am. J. Bot. Li-Cor Advertisement
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

This Article
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Submit a response
Right arrow Alert me when this article is cited
Right arrow Alert me when eLetters are posted
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in ISI Web of Science
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via ISI Web of Science (1)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Weller, S. G.
Right arrow Articles by Dunbar-Wallis, A. K.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Weller, S. G.
Right arrow Articles by Dunbar-Wallis, A. K.
Agricola
Right arrow Articles by Weller, S. G.
Right arrow Articles by Dunbar-Wallis, A. K.
(American Journal of Botany. 2007;94:1716-1725.)
© 2007 Botanical Society of America, Inc.

Reproductive Biology

Sexually dimorphic inflorescence traits in a wind-pollinated species: heritabilities and genetic correlations in Schiedea adamantis (Caryophyllaceae)1

Stephen G. Weller, Ann K. Sakai, Theresa M. Culley, Diane R. Campbell, Paul Ngo and Amy K. Dunbar-Wallis

Department of Ecology and Evolutionary Biology, University of California, Irvine, California 92697 USA; Department of Biological Sciences, University of Cincinnati, Cincinnati, Ohio 45221-0006 USA

ABSTRACT

Sexual dimorphism may be especially pronounced in wind-pollinated species because they lack the constraints of biotically pollinated species that must present their pollen and stigmas in similar positions to ensure pollen transfer. Lacking these constraints, the sexes of wind-pollinated species may diverge in response to the different demands of pollen dispersal and receipt, depending on the magnitude of genetic correlations preventing divergence between sexes. Patterns of sexual dimorphism and genetic variation were investigated for inflorescence traits in Schiedea adamantis (Caryophyllaceae), a species well adapted to wind-pollination, and compared to S. salicaria, a species with fewer adaptations to wind pollination. For S. adamantis, dimorphism was pronounced for inflorescence condensation and its components, including lateral flower number and pedicel length. Within sexes, genetic correlations between traits may constrain the relative shape of the inflorescence. Correlations detected across sexes may retard the evolution of sexual dimorphism in inflorescence structure, including features favoring enhanced dispersal and receipt of pollen. Despite genetic correlations across sexes, common principal components analysis showed that genetic variance–covariance matrices (G matrices) differed significantly between the sexes, in part because of greater genetic variation for flower number in hermaphrodites than in females. G matrices also differed between closely related S. adamantis and S. salicaria, indicating the potential for divergent evolution of inflorescence structure despite general similarities in morphology and pollination biology.

Key Words: genetic correlations • gynodioecy • inflorescence architecture • quantitative genetics • Schiedea adamantis • Schiedea salicaria • sexual dimorphism • wind pollination






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2007 by the Botanical Society of America, Inc.