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AOBPreview published online on September 19, 2007
Annals of Botany, doi:10.1093/aob/mcm223
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© The Author 2007. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Is Eucalyptus Cryptically Self-incompatible?

Tasmien N. Horsley1,2,* and Steven D. Johnson1

1 School of Biological and Conservation Sciences, University of KwaZulu-Natal, Scottsville, South Africa
2 Shaw Research Centre, Sappi Forests, Howick, South Africa

* For correspondence. E-mail: tasmien.horsley{at}sappi.com

Received: 9 May 2007    Returned for revision: 9 July 2007    Accepted: 27 July 2007   

Background and Aims: The probability that seeds will be fertilized from self- versus cross-pollen depends strongly on whether plants have self-incompatibility systems, and how these systems influence the fate of pollen tubes.

Methods: In this study of breeding systems in Eucalyptus urophylla and Eucalyptus grandis, epifluorescence microscopy was used to study pollen tube growth in styles following self- and cross-pollinations.

Key Results: Pollen tubes from self-pollen took significantly longer than those from cross-pollen to grow to the base of the style in both E. urophylla (120 h vs. 96 h) and E. grandis (96 h vs. 72 h). In addition, both species exhibited reduced seed yields following self-pollination compared with cross-pollination.

Conclusions: The present observations suggest that, in addition to a late-acting self-incompatibility barrier, cryptic self-incompatibility could be a mechanism responsible for the preferential out-crossing system in these two eucalypt species.

Key words: Eucalyptus urophylla, Eucalyptus grandis, epifluorescence microscopy, cryptic self-incompatibility


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