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Mycosphaerella leaf disease: genetic variation in damage to Eucalyptus nitens, Eucalyptus globulus, and their F1 hybrid


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Dungey, HS, Potts, BM, Carnegie, AJ and Ades, PK 1997 , 'Mycosphaerella leaf disease: genetic variation in damage to Eucalyptus nitens, Eucalyptus globulus, and their F1 hybrid' , Canadian Journal of Forest Research, vol. 27, no. 5 , pp. 750-759 , doi: 10.1139/cjfr-27-5-750.

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Severity of Mycosphaere/la leaf disease was assessed on the adult and juvenile foliage ofboth controlled crossed
and open-pollinated families ofEucalyptus globulus ssp. globulus Labill., Eucalyptus nitens (Deane & Maiden) Maiden,
Eucalyptus globulus ssp. bicostata (Maiden, Blakely & 1. Simm.) Kirkpatr., and their F1 hybrids in a trial in northwest
Tasmania, Australia. Within ssp_ globulus, disease was more severe on one provenance, Taranna, than another, King Island.
For interprovenance hybrids, differences between parents were inherited in an additive manner, whereas interspecific hybrids
were generally more susceptible than predicted intraspecific midparent values and occasionally, were more susceptible than
the more susceptible parent. Within populations, the narrow-sense heritabilities for Mycosphaerella disease severity were low
to moderate (0.004-0.506), but were consistently higher for adult than for juvenile foliage despite disease severity being
higher on juvenile foliage. Parental breeding values and heritabilities estimated from open-pollinated progeny were similar to
estimates obtained from controlled crosses involving the same parents. Complex genetic interactions were detected between
growth, vegetative phase change, and disease severity. It is possible that selection for rapid growth in an environment without
disease may result in indirect selection for susceptibility.

Item Type: Article
Authors/Creators:Dungey, HS and Potts, BM and Carnegie, AJ and Ades, PK
Journal or Publication Title: Canadian Journal of Forest Research
ISSN: 0045-5067
DOI / ID Number: 10.1139/cjfr-27-5-750
Additional Information:

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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