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Breeding against dothistroma needle blight of radiata pine in Australia

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Abstract:

Pine needle blight, caused by Dothistroma septosporum (Dorog.) M. Morelet, is one of the most serious foliar diseases of Pinus spp. in Australia and New Zealand. In 16 Pinus radiata (D.Don.) progeny trials in northeastern Victoria, Australia, Dothistroma-caused defoliation varied widely among trials and assessment years, ranging from 5% to 65%. The estimated narrow sense heritability ranged from nonsignificant to as high as 0.69 with a median of 0.36. Spatial autocorrelation of residuals accounted for a significant proportion of residual variance, and that increased heritability estimates. Genetic correlation between defoliation scores at an early age and growth at a later age was negative with a median value of–0.39. Phenotypic correlation between defoliation and survival was low and negative with a median value of–0.11. Economic analyses indicated that at sites with a high risk of infection, the effect of reducing defoliation on profitability was comparable with that of increasing growth at sites free from infection. The genetic parameters and economic impacts of Dothistroma were used to derive selection indices and include resistance to defoliation into the current breeding objective for radiata pine.

La brûlure des aiguilles du pin causée par Dothistroma septosporum (Dorog.) M. Morelet est une des plus sérieuses maladies de feuilles de Pinus spp. en Australie et en Nouvelle-Zélande. Dans 16 tests de descendance de Pinus radiata (D.Don) établis dans le nord-est de l’État de Victoria, en Australie, la défoliation causée par Dothistroma variait grandement selon le test et l’année d’évaluation, allant de 5 à 65 %. Les estimations de l’héritabilité au sens strict variaient de non significatives à aussi élevées que 0,69 avec une valeur médiane de 0,36. L’autocorrélation spatiale des résidus expliquait une proportion significative de la variance résiduelle, ce qui a augmenté les estimations de l’héritabilité. La corrélation génétique entre les scores de défoliation en bas âge et la croissance à un âge plus avancé était négative et avait une valeur médiane de–0,39. La corrélation phénotypique entre la défoliation et la survie était faible et négative avec une valeur médiane de–0,11. Des analyses économiques indiquent que l’effet de réduire la défoliation sur des stations où le risque d’infection est élevé est comparable à celui d’augmenter la croissance sur des stations exemptes d’infection. Les paramètres génétiques et les impacts économiques de Dothistroma ont été utilisés pour dériver des indices de sélection et inclure la résistance à la défoliation parmi les objectifs d’amélioration du pin de Monterey.

Document Type: Research Article

Publication date: 2010-08-01

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  • Published since 1971, this monthly journal features articles, reviews, notes and commentaries on all aspects of forest science, including biometrics and mensuration, conservation, disturbance, ecology, economics, entomology, fire, genetics, management, operations, pathology, physiology, policy, remote sensing, social science, soil, silviculture, wildlife and wood science, contributed by internationally respected scientists. It also publishes special issues dedicated to a topic of current interest.
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