Am. J. Bot. Subscribe to E-TOCs
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 Similar articles in PubMed
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 HighWire
Right arrow Citing Articles via ISI Web of Science (13)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Lowe, A. J.
Right arrow Articles by Abbott, R. J.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Lowe, A. J.
Right arrow Articles by Abbott, R. J.
Agricola
Right arrow Articles by Lowe, A. J.
Right arrow Articles by Abbott, R. J.
(American Journal of Botany. 2000;87:1159-1167.)
© 2000 Botanical Society of America, Inc.

Routes of origin of two recently evolved hybrid taxa: Senecio vulgaris var. hibernicus and York radiate groundsel (Asteraceae)1

Andrew J. Lowe2,0 and Richard J. Abbott0

0 Institute of Environmental and Evolutionary Biology, School of Biology, Harold Mitchell Building, University of St Andrews, St Andrews, Fife KY16 9TH, UK

ABSTRACT

The possible pathways of origin of two recently arisen introgressant forms of Senecio vulgaris (i.e., var. hibernicus and York radiate groundsel) were investigated in experimental crosses between tetraploid S. vulgaris var. vulgaris and the normally diploid S. squalidus. Comparison of the morphology of synthesized hybrid progeny with established taxa, by discriminant function analysis, revealed that fertile hybrid offspring similar in morphology to S. vulgaris var. hibernicus and York radiate groundsel could be synthesized: (1) following formation of genomically stable diploid gametes by the triploid hybrid; (2) through the production of unreduced gametes by diploid S. squalidus; and (3) when a tetraploid form of S. squalidus acted as one of the parents. It was evident that hybrid offspring similar in morphology to the two introgressant taxa were more often produced in backcrosses to S. vulgaris than in segregating F2 or F3 generations (53% as opposed to 36%), and that fertile hybrid progeny were formed within two generations. Because hybridization between S. vulgaris and S. squalidus occurs regularly, although at very low frequency, in natural mixed populations in the British Isles, there is the potential for multiple origins to occur in the wild of both S. vulgaris var. hibernicus and York radiate groundsel.

Key Words: Asteraceae • hybrid origin • hybridization • introgression • Senecio.




This article has been cited by other articles:


Home page
 Am. J. Bot.Home page
H. Kirk, K. Vrieling, and P. G. L. Klinkhamer
Reproductive fitness of hybrids between Senecio jacobaea and S. aquaticus (Asteraceae)
Am. J. Botany, September 1, 2005; 92(9): 1467 - 1473.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2000 by the Botanical Society of America, Inc.