Variation in growth and Quambalaria tolerance of clones of Corymbia citriodora subsp. variegata planted on four contrasting sites in north-eastern NSW
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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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.