Is Eucalyptus Cryptically Self-incompatible?
| Autor: | Horsley TN; School of Biological and Conservation Sciences, University of KwaZulu-Natal, Scottsville, South Africa. tasmien.horsley@sappi.com, Johnson SD |
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| Jazyk: | angličtina |
| Zdroj: | Annals of botany [Ann Bot] 2007 Dec; Vol. 100 (6), pp. 1373-8. Date of Electronic Publication: 2007 Sep 19. |
| DOI: | 10.1093/aob/mcm223 |
| Abstrakt: | 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. |
| Databáze: | MEDLINE |
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