AOBPreview published online on April 3, 2003
Annals of Botany, doi:10.1093/aob/mcg085
© 2003 by Annals of Botany Company
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Submitted on November 22, 2002
Affiliation of the authors:
1 Department of Botany, University of Toronto, 25 Willcocks Street, Toronto, Ontario, Canada M5S 3B2;
2 School of Biological Sciences, Victoria University of Wellington, PO Box 600, Wellington, New Zealand
* To whom correspondence should be addressed. E-mail: tsage{at}botany.utoronto.ca.
Species within the genus Pseudowintera exhibit high rates of self-sterility. Self-sterility in the genus has been previously posited--but not confirmed--to be the result of late-acting ovarian self-incompatibility (OSI) functioning within nucellar tissue of the ovule to prevent self pollen tubes from entering the embryo sac. Structural and functional aspects of pollen-carpel interactions and early seed development following cross- and self-pollination were investigated in P. axillaris to determine the site, timing and possible mechanisms of self-sterility. No significant differences were observed between pollen tube growth, ovule penetration and double fertilization following cross- and self-pollination. Pollen tubes exhibited phasic growth in an extracellular matrix composed of proteins and carbohydrates, as well as arabinogalactans/arabinogalactan proteins. A uniform failure in embryo sac development prior to division of the zygote was apparent within 15 d following double fertilization by self gametes. Results indicate that SI mechanisms in P. axillaris do not prevent double fertilization from occurring. Instead, mechanisms of self-sterility affect post-zygotic development of the embryo sac. Although self-sterility may be attributed to inbreeding depression, given the post-zygotic nature of failure in embryo sac development, the possibility of late-acting OSI is discussed.
Revised on December 16, 2002
Accepted on February 6, 2003
Evidence for Ovarian Self-incompatibility as a Cause of Self-sterility in the Relictual Woody Angiosperm, Pseudowintera axillaris (Winteraceae)
TAMMY L. SAGE1* and F. BRUCE SAMPSON2
Key words: Embryo sac, late-acting self-incompatibility, ovarian self-incompatibility, early-acting inbreeding depression, pollination-regulated development.
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