Am. J. Bot. Tips for Better Browsing
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

This Article
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 HighWire
Right arrow Citing Articles via ISI Web of Science (10)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Motley, T. J.
Right arrow Articles by Carr, G. D.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Motley, T. J.
Right arrow Articles by Carr, G. D.
Agricola
Right arrow Articles by Motley, T. J.
Right arrow Articles by Carr, G. D.

American Journal of Botany, Vol 85, 654, Copyright © 1998 by Botanical Society of America, Inc.

REPRODUCTIVE BIOLOGY

Artificial hybridization in the Hawaiian endemic genus Labordia (Loganiaceae)

TJ Motley and GD Carr

Cross-pollinations were performed within and among eight species of Labordia from Oahu, Molokai, and Hawaii, and one species from Guam of the closely related genus Geniostoma. Detailed floral examination confirmed that the species are functionally dioecious, i.e., a given individual lacks either ovules or pollen grains. Female inflorescences bagged to prevent pollination never produced seed, but intraspecific crosses between male and female individuals nearly always yielded fruits with viable seed (>80%). Interspecific crosses between species from different islands and separate taxonomic sections of the genus also yielded good fruit set (>55%). Interspecific F1 hybrids were vigorous and appeared to be morphologically intermediate to their parents. Intergeneric crosses between Geniostoma and Labordia failed. Chromosome counts from Labordia species were found to be 2n = 80 or 2n =~80, twice the chromosome complement of two collections examined from its postulated ancestor, Geniostoma rupestre. Labordia species are distinct morphologically, ecologically, and geographically but apparently lack genetic barriers to interbreeding. This suggests that geographical and ecological isolation, recentness of colonization, and/or rapid speciation have been important factors in the origin of species of Labordia.


This article has been cited by other articles:


Home page
 Am. J. Bot.Home page
B. G. Baldwin
Adaptive radiation of shrubby tarweeds (Deinandra) in the California Islands parallels diversification of the Hawaiian silversword alliance (Compositae-Madiinae)
Am. J. Botany, February 1, 2007; 94(2): 237 - 248.
[Abstract] [Full Text] [PDF]

Home page
 Am. J. Bot.Home page
R. G. Olmstead
Are invasive plants an inevitable consequence of evolution?
Am. J. Botany, August 1, 2006; 93(8): 1236 - 1239.
[Full Text] [PDF]

Home page
 Am. J. Bot.Home page
T. Wendt, M. B. F. Canela, A. P. Gelli de Faria, and R. I. Rios
Reproductive biology and natural hybridization between two endemic species of Pitcairnia (Bromeliaceae)
Am. J. Botany, October 1, 2001; 88(10): 1760 - 1767.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1998 by the Botanical Society of America, Inc.