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Factors affecting variation in outcrossing rate in Eucalyptus globulus

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Patterson, B and Vaillancourt, RE and Pilbeam, D and Potts, BM (2004) Factors affecting variation in outcrossing rate in Eucalyptus globulus. Australian Journal of Botany, 52 (6). pp. 773-780. ISSN 0067-1924

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Abstract

The mating system of the animal-pollinated forest tree species Eucalyptus globulus Labill. was investigated in a clonal seed orchard to determine the importance of self-incompatibility, floral timing, floral abundance and canopy position on explaining variation in outcrossing rates. Outcrossing rates were highly and significantly correlated with the degree of self-incompatibility of individual genotypes (R2 = 0.92). Outcrossing rates were also significantly higher in the upper than in the lower parts of tree canopies (0.78 ± 0.1 and 0.54 ± 0.1, respectively). In contrast, neither flowering time nor abundance of flowers on individual trees revealed consistent effects upon outcrossing rates, suggesting that these factors are either less important or inherently more unpredictable because their effects partly depend on complex interactions with animal pollinators. Screening seed orchards in order to identify trees with high self-incompatibility and restricting seed collection to these trees will ensure that a high proportion of the seed used for plantations is derived from outcrossing, thereby minimising the deleterious effects of inbreeding depression.

Item Type: Article
Keywords: out crossing, selfing, Eucalptus globulus
Journal or Publication Title: Australian Journal of Botany
Page Range: pp. 773-780
ISSN: 0067-1924
Identification Number - DOI: 10.1071/BT03186
Additional Information: BM Potts. © CSIRO 2004
Date Deposited: 05 Jun 2008 03:11
Last Modified: 18 Nov 2014 03:42
URI: http://eprints.utas.edu.au/id/eprint/6722
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