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Factors affecting variation in outcrossing rate in Eucalyptus globulus


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Patterson, B, Vaillancourt, RE, Pilbeam, D and Potts, BM 2004 , 'Factors affecting variation in outcrossing rate in Eucalyptus globulus' , Australian Journal of Botany, vol. 52, No. 6 , pp. 773-780 , doi: 10.1071/BT03186.

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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
Authors/Creators:Patterson, B and Vaillancourt, RE and Pilbeam, D and Potts, BM
Keywords: out crossing, selfing, Eucalptus globulus
Journal or Publication Title: Australian Journal of Botany
ISSN: 0067-1924
DOI / ID Number: 10.1071/BT03186
Additional Information:

BM Potts. © CSIRO 2004

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