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Self-compatibility in Eucalyptus globulus spp. globulus (Myrtaceae)

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Pound, LM and Wallwork, MAB and Potts, BM and Sedgley, M (2002) Self-compatibility in Eucalyptus globulus spp. globulus (Myrtaceae). Australian Journal of Botany, 50 (3). pp. 365-372. ISSN 0067-1924

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Abstract

Controlled pollinations with self- and cross-pollen were applied to individual flowers of five mature Eucalyptus globulus Labill. ssp. globulus trees to investigate the site of action of the self-incompatibility mechanism. Growth of pollen tubes in styles at 2 weeks after pollination and ovule penetration by pollen tubes at 2 and 4 weeks after pollination were investigated by fluorescence microscopy. Some pollinated flowers were left to develop to seed maturity, then harvested to quantify the level of self-incompatibility of each tree. Trees ranged from 76 to 100% self-incompatible. There was no significant difference in the number of pollen tubes in the style between treatments although variation was present between trees. The number of pollen tubes present was similar to the number of ovules present within flowers. Penetration of ovules by pollen tubes over all five trees combined revealed no difference between treatments at 2 weeks after pollination; however, there was slightly greater penetration by cross-pollen tubes at 4 weeks after pollination. This difference was not large enough to account for the near complete lack of selfed-seed production, suggesting late pre- or post-zygotic arrest of selfed ovules.

Item Type: Article
Journal or Publication Title: Australian Journal of Botany
Page Range: pp. 365-372
ISSN: 0067-1924
Identification Number - DOI: 10.1071/BT01076
Additional Information: BM Potts. Copyright © 2002 CSIRO
Date Deposited: 02 Oct 2008 05:49
Last Modified: 18 Nov 2014 03:49
URI: http://eprints.utas.edu.au/id/eprint/7512
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