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Effects of inbreeding on population mean performance and observational variances in Eucalyptus globulus


Costa e Silva, J and Hardner, C and Tilyard, PA and Pires, AM and Potts, BM, Effects of inbreeding on population mean performance and observational variances in Eucalyptus globulus, Annals of Forest Science, 67, (6) pp. 605p1-605p9. ISSN 1286-4560 (2010) [Refereed Article]

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Copyright 2010 INRA, EDP Sciences

DOI: doi:10.1051/forest/2010018


Mean performance and variances were studied in self (SELF), open pollinated (OP) and unrelated polymix (POL) crosses of common parentage in Eucalyptus globulus. Inbreeding depression for survival (SURV) and basal area per hectare (BAH) was the highest reported for a SELF eucalypt population, increasing with age to reach 74 and 77%, respectively, over 10 years. Inbreeding depression in the OP was 36% for SURV and 32% for BAH at age 10 years, and estimates of outcrossing rate from BAH were stable across ages, averaging 0.56. In contrast, OP inbreeding depression for stem diameter (DBH) of survivors decreased with age and few selfs appeared to survive to 10 years. There was more variation in DBH between and within SELF than POL families, with variance ratios consistent with rare and partially recessive deleterious alleles causing inbreeding depression. The OP variances were initially more similar to the SELF population but converged to the POL population after 10 years. It is argued that when outcrossing rates are low, as in the present case, inbreeding depression will be a significant force countering local adaptation in forest trees.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Genetics
Research Field:Gene mapping
Objective Division:Plant Production and Plant Primary Products
Objective Group:Forestry
Objective Field:Hardwood plantations
UTAS Author:Tilyard, PA (Mr Paul Tilyard)
UTAS Author:Potts, BM (Professor Brad Potts)
ID Code:67536
Year Published:2010
Web of Science® Times Cited:28
Deposited By:Plant Science
Deposited On:2011-03-04
Last Modified:2012-07-03

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