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dc.contributor.authorYOHEM, KARIN HUMMELL.
dc.creatorYOHEM, KARIN HUMMELL.en_US
dc.date.accessioned2011-10-31T19:03:27Z
dc.date.available2011-10-31T19:03:27Z
dc.date.issued1982en_US
dc.identifier.urihttp://hdl.handle.net/10150/188169
dc.description.abstractPhellinus weirianus (Aphyllophorales: Hymenochaetaceae) causes a white heartrot of living Juglans and is the major cause of decay in Arizona black walnut. Infection is caused by germinating basidiospores. Tissue isolates fruit in culture, but single basidiospore isolates do not. The growth of tissue and single-spore isolates is slow to very slow. Cultural morphology is quite variable even among single-spore isolates derived from a single, culturally produced basidiocarp. Single-spore isolates, presumed to be homokaryotic, are derived from uninucleate spores that germinate and develop hyphae with paired nuclei. Lack of fruiting in homokaryons suggests that P. weirianus is heterothallic. Tissue isolates derived from basidiocarps produced in nature are assumed to be heterokaryotic. Hyphae of tissue isolates have nuclei that are not paired and are more numerous than those in single-spore isolates. Interaction zones are formed in pairings of heterokaryons, pairings of homokaryons, and pairings of homokaryons with the parent heterokaryon. Homozygous matings do not form an interaction zone. Agar-block decay tests show that single-spore isolates exhibit no appreciable differences in decay capacity from tissue isolates. Phellinus weirianus readily decays woods of associated riparian species (Arizona alder, velvet ash, southwestern chokecherry, netleaf oak, and Arizona sycamore) in standard wood test blocks although it is not known on these hosts in nature.
dc.language.isoenen_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.subjectWalnut -- Diseases and pests -- Arizona.en_US
dc.subjectWood-decaying fungi -- Arizona.en_US
dc.titleCULTURAL MORPHOLOGY, SEXUALITY, AND DECAY CAPACITIES OF PHELLINUS WEIRIANUS.en_US
dc.typetexten_US
dc.typeDissertation-Reproduction (electronic)en_US
dc.identifier.oclc681979895en_US
thesis.degree.grantorUniversity of Arizonaen_US
thesis.degree.leveldoctoralen_US
dc.contributor.committeememberBloss, H. E.en_US
dc.contributor.committeememberGilbertson, R. L.en_US
dc.contributor.committeememberMisaghi, I. J.en_US
dc.contributor.committeememberNelson, M. R.en_US
dc.contributor.committeememberStanghellini, M. E.en_US
dc.identifier.proquest8217487en_US
thesis.degree.disciplinePlant Pathologyen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.namePh.D.en_US
refterms.dateFOA2018-08-24T04:53:17Z
html.description.abstractPhellinus weirianus (Aphyllophorales: Hymenochaetaceae) causes a white heartrot of living Juglans and is the major cause of decay in Arizona black walnut. Infection is caused by germinating basidiospores. Tissue isolates fruit in culture, but single basidiospore isolates do not. The growth of tissue and single-spore isolates is slow to very slow. Cultural morphology is quite variable even among single-spore isolates derived from a single, culturally produced basidiocarp. Single-spore isolates, presumed to be homokaryotic, are derived from uninucleate spores that germinate and develop hyphae with paired nuclei. Lack of fruiting in homokaryons suggests that P. weirianus is heterothallic. Tissue isolates derived from basidiocarps produced in nature are assumed to be heterokaryotic. Hyphae of tissue isolates have nuclei that are not paired and are more numerous than those in single-spore isolates. Interaction zones are formed in pairings of heterokaryons, pairings of homokaryons, and pairings of homokaryons with the parent heterokaryon. Homozygous matings do not form an interaction zone. Agar-block decay tests show that single-spore isolates exhibit no appreciable differences in decay capacity from tissue isolates. Phellinus weirianus readily decays woods of associated riparian species (Arizona alder, velvet ash, southwestern chokecherry, netleaf oak, and Arizona sycamore) in standard wood test blocks although it is not known on these hosts in nature.


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