Am. J. Bot. Join the BSA
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 (14)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Norman, J. K.
Right arrow Articles by Sakai, A. K.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Norman, J. K.
Right arrow Articles by Sakai, A. K.
Agricola
Right arrow Articles by Norman, J. K.
Right arrow Articles by Sakai, A. K.

American Journal of Botany, Vol 84, 641, Copyright © 1997 by Botanical Society of America, Inc.

REPRODUCTIVE BIOLOGY

Pollination biology and outcrossing rates in hermaphroditic Schiedea lydgatei (Caryophyllaceae)

JK Norman, SG Weller and AK Sakai

The influence of outcrossing and pollination biology on the maintenance of hermaphroditism was studied for Schiedea lydgatei (Caryophyllaceae: Alsinoideae), a species endemic to Moloka`i in the Hawaiian Islands. Schiedea lydgatei is the only hermaphroditic species in an otherwise dimorphic clade and hermaphroditism is likely the result of a reversal from a gynodioecious ancestor. Both wind and native moths in the family Pyralidae are responsible for pollination in S. lydgatei. Outcrossing rates were generally high (0.80), especially in years when the greatest number of plants were flowering. The combination of high outcrossing rates and substantial inbreeding depression indicates that at present females would not be favored in the population. Pollination by both wind and insects is consistent with the hypothesis that hermaphroditism is the result of a relatively recent reversal, as the ancestor of S. lydgatei was probably wind pollinated and gynodioecious with few females in the populations. A shift from wind to predominately insect pollination on Moloka`i may have resulted in increased outcrossing rates and prevented the expression of high inbreeding depression among progeny of hermaphrodites, a condition that would select against females and favor a reversal to hermaphroditism. Because few females were likely to have been present in ancestral populations that colonized Moloka`i, founder effect is another potential explanation for loss of females. In either case, current high levels of outcrossing prevent re-establishment of females in populations of S. lydgatei.


This article has been cited by other articles:


Home page
 ANN BOT (LOND)Home page
R. Qu, X. Li, Y. Luo, M. Dong, H. Xu, X. Chen, and A. Dafni
Wind-Dragged Corolla Enhances Self-Pollination: A New Mechanism of Delayed Self-Pollination
Ann. Bot., November 1, 2007; 100(6): 1155 - 1164.
[Abstract] [Full Text] [PDF]

Home page
 GeneticsHome page
R. G. Shaw, D. L. Byers, and F. H. Shaw
Genetic Components of Variation in Nemophila menziesii Undergoing Inbreeding: Morphology and Flowering Time
Genetics, December 1, 1998; 150(4): 1649 - 1661.
[Abstract] [Full Text]

Home page
 Am. J. Bot.Home page
S. G. Weller, AnnK. Sakai, AnneE. Rankin, A. Golonka, B. Kutcher, and KarenE. Ashby
Dioecy and the evolution of pollination systems inSchiedea and Alsinidendron (Caryophyllaceae:Alsinoideae) in the Hawaiian Islands
Am. J. Botany, October 1, 1998; 85(10): 1377 - 1388.
[Abstract] [Full Text]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1997 by the Botanical Society of America, Inc.