HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

(American Journal of Botany. 2009;96:1907-1921.) doi: 10.3732/ajb.0800416 © 2009 Botanical Society of America, Inc.

What's this?

This Article Full Text Full Text (PDF) Submit a response Alert me when this article is cited Alert me when eLetters are posted Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Google Scholar Articles by Tank, D. C. Articles by Olmstead, R. G. PubMed Articles by Tank, D. C. Articles by Olmstead, R. G. Agricola Articles by Tank, D. C. Articles by Olmstead, R. G. Social Bookmarking                            What's this?

The evolutionary origin of a second radiation of annual Castilleja (Orobanchaceae) species in South America: The role of long distance dispersal and allopolyploidy¹

² Department of Forest Resources & Stillinger Herbarium, College of Natural Resources, University of Idaho, P.O. Box 441133, Moscow, Idaho 83844-1133 USA ³ Department of Biology & Burke Museum of Natural History, University of Washington, Box 355325, Seattle, Washington 98195-5325 USA

ABSTRACT

Considerable attention has been directed toward understanding the wide gaps in range that are common among many groups of closely related organisms. By placing their biology and geography in a phylogenetic context, we may gain a broader knowledge of the series of historical events that have led to present species distributions. In addition to the North American annuals, a second radiation of annual Castilleja species is in Andean Peru and central Chile. Phylogenetic analyses of chloroplast and nuclear DNA regions revealed a complex history for the origin and diversification of annual Castilleja species in South America. In addition to at least three independent long-distance dispersal events from North America, allopolyploidy has played a significant role in this disjunct radiation. Only C. attenuata occurs in both California and South America, and these results support its recent arrival to central Chile. Two Peruvian species are inferred to be allopolyploids; hybridization between annual lineages derived from independent long-distance dispersal events from North America gave rise to C. profunda, and hybridization between South American annual and perennial species gave rise to C. cerroana. The relative importance these events are discussed with reference to the observed morphological, ecological, and distributional patterns.

Key Words: amphitropical disjuncts • biogeography • Castilleja • GBSSI • granule-bound starch synthase/invertase • Indian paintbrush • Orobanchaceae • Peru • waxy

Received for publication 9 December 2008. Accepted for publication 27 May 2009.

FOOTNOTES

¹ The authors thank J. Ammirati, T. Bradshaw, J. M. Egger, B. Moore, and two anonymous reviewers for critical comments on the manuscript, and J. M. Egger, M. Zapata, S. Leiva, A. Sagastegui, and M. Dillon for assistance facilitating fieldwork in Peru. This research was supported by a Graduate Fellowship in Molecular Systematics from the University of Washington Department of Botany, the Research Award for Graduate Students from the American Society of Plant Taxonomists, the Karling Graduate Student Research Award from the Botanical Society of America, the Award for Graduate Student Research from the Society of Systematic Biologists, the Sigma Xi Grants in Aid of Research from the University of Washington Chapter, and the Giles Award for Graduate Student Field Research from the University of Washington Department of Botany to D.C.T., the NSF Doctoral Dissertation Improvement Grant DEB-0412653 to R.G.O. for D.C.T., and the NSF grant DEB-0090313 to R.G.O.

⁴ Author for correspondence (e-mail: dtank{at}uidaho.edu)

CiteULike    Complore    Connotea    Del.icio.us    Digg    Facebook    Reddit    Technorati    Twitter    What's this?