| reclassification of the butternut canker fungus, sirococcus clavigignenti-juglandacearum, into the genus ophiognomonia. | sirococcus clavigignenti-juglandacearum (sc-j), which causes a canker disease on butternut, is largely responsible for the decline of this tree in the united states and canada. the original description of the species was based on anamorphic characters because the teleomorph is unknown. recent phylogenetic investigations have found that sc-j is not a member of the genus sirococcus, and accurate taxonomic classification is required. the objective of this study is to use sequence data to determine ... | 2010 | 21215957 |
| thirteen nuclear microsatellite loci for butternut (juglans cinerea l.). | butternut (juglans cinerea l.) is an eastern north american forest tree severely threatened by an exotic fungal pathogen, sirococcus clavigignenti-juglandacearum. we report here 13 nuclear microsatellites for genetic evaluation of the remaining natural populations. summary statistics are reported for individuals from a population of butternuts in central kentucky (n = 63). all markers were polymorphic, with an average of 13.7 alleles per locus observed. four loci exhibited significantly fewer he ... | 2008 | 21585858 |
| discovery of single-nucleotide polymorphisms (snps) in the uncharacterized genome of the ascomycete ophiognomonia clavigignenti-juglandacearum from 454 sequence data. | the benefits from recent improvement in sequencing technologies, such as the roche gs flx (454) pyrosequencing, may be even more valuable in non-model organisms, such as many plant pathogenic fungi of economic importance. one application of this new sequencing technology is the rapid generation of genomic information to identify putative single-nucleotide polymorphisms (snps) to be used for population genetic, evolutionary, and phylogeographic studies on non-model organisms. the focus of this re ... | 2011 | 21676199 |
| morphological and molecular methods to identify butternut (juglans cinerea) and butternut hybrids: relevance to butternut conservation. | butternut (juglans cinerea l.) is a native, cold-tolerant, hard-mast species formerly valued for its nuts and wood, which is now endangered. the most immediate threat to butternut restoration is the spread of butternut canker disease, caused by the exotic fungus sirococcus clavigignenti-juglandacearum nair, kostichka & kuntz. other threats include the hybridization of butternut with the exotic japanese walnut (juglans ailantifolia carr.) and poor regeneration. the hybrids, known as buartnuts, ar ... | 2008 | 18450577 |
| connection of gnomonia intermedia to discula betulina and its relationship to other taxa in gnomoniaceae. | discula betulina is a foliar pathogen on birch (betula) and gnomonia intermedia is found on overwintered birch leaves. perithecia of g. intermedia developed in vitro on colonies of d. betulina isolated from birch tissues in late summer, and single ascospores of g. intermedia consistently developed into colonies similar to d. betulina, producing typical d. betulina conidia. isolates of d. betulina could be grouped into two mating types, which produced fertile perithecia of g. intermedia when mate ... | 2007 | 17164084 |
| improving disease resistance of butternut (juglans cinerea), a threatened fine hardwood: a case for single-tree selection through genetic improvement and deployment. | approaches for the development of disease-resistant butternut (juglans cinerea l.) are reviewed. butternut is a threatened fine hardwood throughout its natural range in eastern north america because of the invasion of the exotic fungus, sirococcus clavigignenti-juglandacearum nair, kostichka and kuntz, which causes butternut canker. early efforts were made to identify and collect putatively resistant germ plasm, identify vectors and to characterize the disease. more recently, molecular technique ... | 2006 | 16203722 |