Skip Navigation



JXB Advance Access published online on June 1, 2009
Journal of Experimental Botany, doi:10.1093/jxb/erp175
This Article
Right arrow Full Text Freely available
Right arrow FREE Full Text (PDF) Freely available
Right arrowOA All Versions of this Article:
60/12/3387    most recent
erp175v1
Right arrow E-letters: Submit a response
Right arrow Alert me when this article is cited
Right arrow Alert me when E-letters 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 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 arrow Disclaimer
Google Scholar
Right arrow Articles by Goggin, D. E.
Right arrow Articles by Powles, S. B.
PubMed
Right arrow PubMed Citation
Right arrow Articles by Goggin, D. E.
Right arrow Articles by Powles, S. B.
Agricola
Right arrow Articles by Goggin, D. E.
Right arrow Articles by Powles, S. B.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

© 2009 The Author(s).
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. This paper is available online free of all access charges (see http://jxb.oxfordjournals.org/open_access.html for further details)

RESEARCH PAPER

ABA inhibits germination but not dormancy release in mature imbibed seeds of Lolium rigidum Gaud

Danica E. Goggin1,*, Kathryn J. Steadman2, R. J. Neil Emery3, Scott C. Farrow3, Roberto L. Benech-Arnold4 and Stephen B. Powles1

1Western Australian Herbicide Resistance Initiative, School of Plant Biology, University of Western Australia, 35 Stirling Highway, Crawley 6009, Western Australia, Australia
2School of Pharmacy, University of Queensland, Brisbane 4072, Queensland, Australia
3Biology Department, Trent University, Peterborough, Ontario, K9J 7B8, Canada
4IFEVA/Cátedra de Cerealicultura, CONICET/Faculty of Agronomy, University of Buenos Aires, 4453 Avenue San Martín C1417DSE, Buenos Aires, Argentina

* To whom correspondence should be addressed. E-mail: danica{at}plants.uwa.edu.au

Dormancy release in imbibed annual ryegrass (Lolium rigidum Gaud.) seeds is promoted in the dark but inhibited in the light. The role of abscisic acid (ABA) in inhibition of dormancy release was found to be negligible, compared with its subsequent effect on germination of dormant and non-dormant seeds. Inhibitors of ABA metabolism had the expected effects on seed germination but did not influence ABA concentration, suggesting that they act upon other (unknown) factors regulating dormancy. Although gibberellin (GA) synthesis was required for germination, the influence of exogenous GA on both germination and dormancy release was minor or non-existent. Embryo ABA concentration was the same following treatments to promote (dark stratification) and inhibit (light stratification) dormancy release; exogenous ABA had no effect on this process. However, the sensitivity of dark-stratified seeds to ABA supplied during germination was lower than that of light-stratified seeds. Therefore, although ABA definitely plays a role in the germination of annual ryegrass seeds, it is not the major factor mediating inhibition of dormancy release in imbibed seeds.

Key words: Abscisic acid, dormancy release, fluridone, germination, gibberellins, Lolium rigidum, seed

Received 14 January 2009; Revised 20 April 2009 Accepted 8 May 2009


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?




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.