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Phytophthora cinnamomi, a highly variable pathogen with epidemiological consequences in California natural ecosystems

AuthorsSerrano, María S. CSIC ORCID CVN; González, Mario; Garbelotto, M.
Issue Date19-Mar-2017
PublisherInternational Union of Forest Research Organizations
Citation8th Meeting of the IUFRO Working Party 7.02.09: Phytophthora in Forests and Natural Ecosystems; Sapa, Vietnam; 19-25 March 2017
Abstractmultiple introductions in California of the exotic pathogen Phytophthora cinnamomi are severely threatening the biodiversity of its native ecosystems. Virulence of 10 different genotypes representatives of the worldwide genetic variability within P. cinnamomi species was studied both on roots and stems and on four important natural Californian hosts for this pathogen. The disease expression depended on the individual genotypes which initiated the infection, although the high susceptibility exhibited by Pacific madrone and whiteleaf manzanita may mask possible variation in virulence. Some genotypes better adapted as root than stem pathogens have enhanced their abilities to cause symptoms on aerial vs. underground portions of plants, producing a different disease expression. Likewise, bay laurel acts mainly as a root host, although with meager aerialsymptom progression, whereas Pacific madrone and manzanita are general hosts. In general, the highest level of disease was caused by four isolates, two of them of a genetic lineage recently identified in farms and wild lands in California (Clade B), but not worldwide spread. In addition, the highest virulence on roots of Douglas firs was produced by one the genotypes isolated in Papua New Guinea. So, the differences in the genotypes’ affinity to both hosts and parts within hosts should be taken account by regulations to appropriately protect wild resources and plants production facilities. 
Appears in Collections:(IRNAS) Comunicaciones congresos

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