Skip Navigation


AOBPreview first published online on July 28, 2006
This version published online on July 28, 2006
Annals of Botany, doi:10.1093/aob/mcl168
This Article
Right arrow FREE Full Text (PDF) Freely available
Right arrow All Versions of this Article:
100/2/423    most recent
mcl168v2
mcl168v1
Right arrow Alert me when this article is cited
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 PubMed
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by RODRÍGUEZ-RIAÑO, T.
Right arrow Articles by DAFNI, A.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by RODRÍGUEZ-RIAÑO, T.
Right arrow Articles by DAFNI, A.
Agricola
Right arrow Articles by RODRÍGUEZ-RIAÑO, T.
Right arrow Articles by DAFNI, A.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

© The Author 2006. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
Received September 20, 2005
Revised February 24, 2006
Accepted May 3, 2006

Lamiaceae Highlight: Article

Pollen-Stigma Interference in Two Gynodioecious Species of Lamiaceae with Intermediate Individuals

TOMÁS RODRÍGUEZ-RIAÑO 1 * and AMOTS DAFNI 2

1 Facultad de Ciencias, Universidad de Extremadura, 06071, Badajoz, Spain
2 Institute of Evolution, Haifa University, Haifa 31905, Israel

* To whom correspondence should be addressed.
TOMÁS RODRÍGUEZ-RIAÑO, E-mail: trodri{at}unex.es


  Abstract

• Background and Aims Intermediate individuals (perfect flowers with very high degree of pollen abortion) in a gynodioecious plant species are very rare. A study is made of male-female relationships in each flower type and how floral characters can enhance the avoidance of ‘pollen discounting’ and ‘self-pollination’ in two gynodioecious species, Teucrium capitatum and Origanum syriacum.

• Methods The relationship between stigma receptivity and pollen viability was studied in two gynodioecious protandrous species of Lamiaceae, in addition to measuring some floral morphological characters over the life span of the flowers.

• Key Results Three plant types in each species were found: plants bearing hermaphrodite (or male fertile) flowers (MF), female (or male sterile) flowers (MS) and intermediate flowers (INT). Plant types differed in flower size, with MS types being shorter than the other two types. There was no difference in style length among plant types in T. capitatum. Stigma receptivity decayed with floral age and was negative and significantly correlated with pollen viability in the two species, and positive and significantly correlated with style length in O. syriacum but only in MS flowers of T. capitatum.

• Conclusions Reduction in size of floral characters is associated with male sterility, except style length in T. capitatum. MF flowers have two successive reproductive impediments: self-pollination and pollen-stigma interference. In both species, self-pollination is avoided by dichogamy (negative correlation between stigma receptivity and pollen viability), and pollen-stigma interference shows two different patterns: (1) style elongation in O. syriacum is characterized by a significant length increase, final MF dimensions are greater than those of MS dimensions, and style length is positively and significantly correlated with stigma receptivity; and (2) style movement in T. capitatum is characterized by a non-significant increase in style length, final MF floral dimensions are similar to those of MS dimensions, and there is no correlation between style length and stigma receptivity.

Keywords: Dichogamy, gynodioecy, Lamiaceae, Origanum syriacum, pollen discounting, pollen-stigma interference, pollen viability, protandry, stigma receptivity, style movement, style elongation, Teucrium capitatum.
Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?


This article has been cited by other articles:


Home page
 J Exp BotHome page
Compiled by, F. Tooke, T. Chiurugwi, and N. Battey
Flowering Newsletter bibliography for 2007
J. Exp. Bot., July 18, 2008; (2008) ern109v1.
[Full Text] [PDF]

Home page
 ANN BOT (LOND)Home page
R. Classen-Bockhoff
Floral Construction and Pollination Biology in the Lamiaceae
Ann. Bot., August 1, 2007; 100(2): 359 - 360.
[Full Text] [PDF]


Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.