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Many rust fungi (Uredinales) that infect rhododendrons are difficult to identify because of similar spore size & overall morphology. This study examined herbarium specimens of Asian rhododendron rusts by light microscopy & scanning electron microscopy as part of a morphological study of rusts in the genus Chrysomyxa. The specimens were compared with similar taxa from Europe & North America. Revised & illustrated descriptions are provided for the uredinia & telia of Chrysomyxa dietelii and C. succinea; details of the conspicuous uredinial peridium of both species are described for the first time. A new genus & species is proposed to accommodate a rust fungus with uredinia covered by a peridium of ornamented cells and teliospores enclosed in transparent outer sheaths. Three new anamorphic species with unique urediniospore morphology are also described. A key to Asian rhododendron rusts that form uredinia is also provided.
Western Oregon is home to native Rhododendron species and is the center for cultivated Rhododendron production in the United States. These Rhododendron spp. are known to be infected with fungal endophytes. However, the community structure of these endophytes in native and cultivated Rhododendron is poorly understood. Our study targeted the foliar fungal endophyte communities of two native Rhododendron spp. and two non-native commercially cultivated Rhododendron varieties. Parallel culturedependent (fungal isolation and identification based on ITS sequencing) and cultureindependent sequencing approaches (metagenomic sequencing of the ITS region using 454 pyrosequencing) were employed, and results provided evidence of distinctly different community structure in each host species. Additionally, results indicated higher diversity among cultivated and nursery grown Rhododendron. This suggests that the close proximity of the nurseries sampled to the forest environment allows exposure to two distinct sources of endophyte infection. Together, our results show the importance of host identity and environment in structuring the associated endophyte communities.
This substantially updated edition now in full colour provides key techniques used when working with fungal and fungal-like plant pathogens. As a practical manual it also deals with disease recognition, detection and identification of fungi, plus methods to characterise and curate fungi and handle them under quarantine and quality assurance systems. Fungal Plant Pathogens: Applied Techniques, 2nd edition provides a valuable guide to investigating fungal plant diseases and interpreting laboratory findings for postgraduate and advanced undergraduate students, extension plant pathologists, consultants and advisers in agriculture, forestry and horticulture, and the food supply chain.