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Genetic resistance of Eucalyptus globulus to autumn gum moth defoliation and the role of cuticular waxes


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Jones, TH, Potts, BM, Vaillancourt, RE and Davies, NW 2002 , 'Genetic resistance of Eucalyptus globulus to autumn gum moth defoliation and the role of cuticular waxes' , Canadian Journal of Forest Research, vol. 32, no. 11 , pp. 1961-1969 , doi: 10.1139/x02-118.

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This study investigated the association between resistance of Eucalyptus globulus Labill. to autumn gum moth (Mnesempala privata Guenée) defoliation and cuticular wax compounds. In a field trial consisting of clonally replicated F2 families of E. globulus, situated in Tasmania, Australia, significant genetic variation in resistance was detected in two of three F2 families. The broad-sense heritability for defoliation within families ranged from 0.24 to 0.33. The 15 most resistant and the 15 most susceptible genotypes within each variable family were compared for their relative levels of 26 cuticular wax compounds. While no significant correlation between resistance and total wax yield estimates was found, significant differences were detected between resistant and susceptible classes in the relative quantities of several aliphatic phenylethyl and benzyl wax esters within both families. This association does not appear to be a response induced by defoliation. The broad-sense heritabilities of the variation in these compounds were high (0.82-0.94). Our findings suggest that these wax compounds are a mechanism of genetic resistance to autumn gum moth in E. globulus.

Item Type: Article
Authors/Creators:Jones, TH and Potts, BM and Vaillancourt, RE and Davies, NW
Journal or Publication Title: Canadian Journal of Forest Research
DOI / ID Number: 10.1139/x02-118
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BM Potts. Copyright 2002, National Research Council. Please refer to the journal link for access to the definitive, published version. Under the Canadian Copyright Act, individuals may download or print single copies of articles for personal research or study. Any person may reproduce short excerpts from articles in the journals for any purpose that respects the moral rights of authors, provided that the source is fully acknowledged. As a courtesy, the consent of authors of such material should be obtained directly from the author.

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