Variation in Susceptibility of Tanoak to the NA1 and EU1 Lineages of Phytophthora ramorum, the Cause of Sudden Oak Death

Phytophthora ramorum, the cause of sudden oak death (SOD), kills tanoak (Notholithocarpus densiflorus) trees in southwestern Oregon and California. Two lineages of P. ramorum are now found in wildland forests of Oregon (NA1 and EU1). In addition to the management of SOD in forest ecosystems, disease...

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Veröffentlicht in:Plant disease. - 1997. - 103(2019), 12 vom: 25. Dez., Seite 3154-3160
1. Verfasser: Søndreli, Kelsey L (VerfasserIn)
Weitere Verfasser: Kanaskie, Alan, Keriö, Susanna, LeBoldus, Jared M
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2019
Zugriff auf das übergeordnete Werk:Plant disease
Schlagworte:Journal Article EU1 NA1 Phytophthora ramorum clonal lineage cultivar/resistance disease management forest invasive disease oomycetes trees
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520 |a Phytophthora ramorum, the cause of sudden oak death (SOD), kills tanoak (Notholithocarpus densiflorus) trees in southwestern Oregon and California. Two lineages of P. ramorum are now found in wildland forests of Oregon (NA1 and EU1). In addition to the management of SOD in forest ecosystems, disease resistance could be used as a way to mitigate the impact of P. ramorum. The objectives of this study were to (i) characterize the variability in resistance of N. densiflorus among families using lesion length; (ii) determine whether lineage, isolate, family, or their interactions significantly affect variation in lesion length; and (iii) determine whether there are differences among isolates and among families in terms of lesion length. The parameters isolate nested within lineage (isolate[lineage]) and family × isolate(lineage) interaction explained the majority of the variation in lesion length. There was no significant difference between the NA1 and EU1 lineages in terms of mean lesion length; however, there were differences among the six isolates. Lesions on seedlings collected from surviving trees at infested sites were smaller, on average, than lesions of seedlings collected from trees at noninfested sites (P = 0.0064). The results indicate that there is potential to establish a breeding program for tanoak resistance to SOD and that several isolates of P. ramorum should be used in an artificial inoculation assay 
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650 4 |a disease management 
650 4 |a forest 
650 4 |a invasive disease 
650 4 |a oomycetes 
650 4 |a trees 
700 1 |a Kanaskie, Alan  |e verfasserin  |4 aut 
700 1 |a Keriö, Susanna  |e verfasserin  |4 aut 
700 1 |a LeBoldus, Jared M  |e verfasserin  |4 aut 
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