NDLI: Genetic variation inEucalyptus globulus for susceptibility to Mycosphaerella nubilosa and its association with tree growth

Content Provider	Springer Nature Link
Author	Milgate, A. W. Potts, B. M. Joyce, K. Mohammed, C. Vaillancourt, R. E.
Copyright Year	2005
Abstract	Mycosphaerella species are fungal leaf pathogens of Eucalyptus globulus, one of the major plantation tree species in temperate regions of the world. We examined the quantitative genetic variation in susceptibility to infection by Mycosphaerella nubilosa in a genetically diverse population ofE. globulus families growing in a field trial in north-west Tasmania. Disease incidence and severity were assessed on juvenile foliage following a heavy epidemic where mean leaf area damage was 34%. Disease incidence was uniform across the trial. Significant genetic variation for susceptibility was detected with a narrow sense heritability of disease severity being the highest yet reported (h$^{2}$=0.60) for aMycosphaerella disease of eucalypts. M. nubilosa damage had a significant deleterious effect on tree growth at both the phenotypic and genetic level. We suggest that E. globulus has at least two mechanisms involved in avoiding the deleterious effects of this disease, one is through resistance of the juvenile foliage per se and the other is through the ontogenetic switch to the resistant adult foliage. There is ample opportunity to select genotypes ofE. globulus that are relatively resistant to damage and if these are deployed in areas of high disease risk, significant benefits in plantation productivity could be obtained.
Starting Page	11
Ending Page	18
Page Count	8
File Format	PDF
ISSN	08153191
Journal	Australasian Plant Pathology
Volume Number	34
Issue Number	1
e-ISSN	14486032
Language	English
Publisher	Springer Netherlands
Publisher Date	2005-01-01
Publisher Institution	Australasian Plant Pathology Society
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Plant Pathology Plant Sciences Agriculture Entomology Ecology
Content Type	Text
Resource Type	Article
Subject	Plant Science

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