Genetic parameters, including heritabilities, trait–trait correlations and across-site correlations for growth traits and quambalaria shoot blight damage were estimated in four Corymbia citriodora subsp. variegata clonal trials in northern New South Wales, Australia. Additive and non-additive variances were calculated separately to allow the estimation of broad- and narrow-sense heritabilities. Quambalaria shoot blight damage at ages 1 and 3.5 y was under predominantly non-additive genetic control (H2 = 0.02–0.46, h2 = 0–0.17). Growth traits at age 5 y were under moderate genetic control (H2 = 0.32–0.54, h2 = 0–0.54). Growth traits were strongly correlated with quambalaria shoot blight damage. Across-site correlations were low for quambalaria shoot blight damage (rg = 0.13–1.00) but high (> 0.8) for the growth traits. Index selection was used to determine the most efficient selection strategies for improvement of growth and disease tolerance.
Lan, J, Raymond, CA, Smith, HJ, Thomas, DS, Henson, M, Carnegie, A J & Nichols, JD 2011, 'Variation in growth and Quambalaria tolerance of clones of Corymbia citriodora subsp. variegata planted on four contrasting sites in north eastern NSW', Australian Forestry, vol. 74, no. 3, pp. 205-17.
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