Multiple new phenotypic taxa from trees and riparian ecosystems in Phytophthora gonapodyides-P. megasperma ITS Clade 6, which tend to be high-temperature tolerant and either inbreeding or sterile

Fishing for Phytophthora from Western Australia’s waterways: a distribution and diversity survey

“…Several new species have recently been described from ITS Clade 9 from irrigation water (Hong et al 2008(Hong et al , 2010, however, the pathogenicity of these species is unknown and they may fill a similar ecological niche to that proposed for Clade 6 with a predominance in native riparian, forest and woody ecosystems (Brasier et al 2003a;Jung et al 2011;Nechwatal et al 2012). Davison et al (2005) had previously isolated P. cinnamomi var.…”

“…Among this list are the notorious plant pathogens, P. ramorum and P. cinnamomi (Palzer 1980;Von Broembsen 1984;Smith et al 2009;Sutton et al 2009). Also commonly recovered are Clade 6 Phytophthora species which are hypothesised as having a prevalently saprophytic lifestyle (Brasier et al 2003a;Hansen et al 2012) as supported by their presence and dominance in water surveys (e.g. Hansen and Delatour 1999;Reeser et al 2011).…”

“…Brasier et al 2003a;Hong et al 2008;Hulvey et al 2010;Reeser et al 2011;Scibetta et al 2012). Among this list are the notorious plant pathogens, P. ramorum and P. cinnamomi (Palzer 1980;Von Broembsen 1984;Smith et al 2009;Sutton et al 2009).…”

AFLP analysis reveals a clonal population of Phytophthora pinifolia in Chile

“…Likewise, crossing of isolates with defined mating tester strains of several species of Phytophthora spp., including Phytophthora drechsleri and Phytophthora cambivora that have been shown to induce sexual structures in other Phytophthora species (Brasier et al 2003a;2003b;Brasier and Kirk 2004), did not induce the production of gametangia. Phytophthora pinifolia resides in Clade 6 of Phytophthora phylogeny (Cooke et al 2000;Durán et al 2008) and there was a possibility that sexual structures might have been induced, as has been the case for Phytophthora inundata and Phytophthora gonapodyides (Brasier et al 2003a) that also reside in this clade. This absence of sexual structures suggests that P. pinifolia is sterile, similar to the recently described species Phytophthora gallica (Jung & Nechwatal 2008).…”

“…(Cooke et al 2000), but is much more common among species in Clade 6 where P. pinifolia resides. In this clade, over 50 % of the taxa examined by Brasier et al (2003a) are fully sterile, or sterile but acting as silent A1 mating type strains. The sterility in Phytophthora spp.…”