Identification of P hytophthora species baited and isolated from forest soil and streams in northwestern Y unnan province, C hina
2013; Wiley; Volume: 43; Issue: 2 Linguagem: Inglês
10.1111/efp.12015
ISSN1439-0329
AutoresWen-Xia Huai, Guihua Tian, Everett M. Hansen, Weina Zhao, Ellen Michaels Goheen, Niklaus J. Grünwald, Cai-Fang Cheng,
Tópico(s)Yeasts and Rust Fungi Studies
ResumoSummary Phytophthora species were surveyed by collecting soil samples and placing bait leaves in selected streams during June–October in the years 2005, 2006 and 2010 at three sites in oak forests in D iqing T ibetan Autonomous Prefecture of NW Yunnan province, China. Seventy‐three isolates of P hytophthora spp. were recovered from 135 baited leaf samples and 81 soil samples. Eight Phytophthora species were identified by observation of morphological features and ITS1‐5.8S‐ITS2 rDNA sequence analysis. The eight taxa included two well‐known species P. gonapodyides and P. cryptogea , two recently described species P. gregata and P. plurivora , two named but as yet undescribed taxa, P. taxon PgChlamydo and P. taxon Salixsoil, and two previously unrecognized species, P hytophthora sp.1 and P . sp.2. The most numerous species, P. taxon PgChlamydo, and the second most abundant species, P. taxon S alixsoil, were recovered at all three sites. Phytophthora cryptogea was detected only once at site Nixi. Phytophthora gregata and P . sp.2 were isolated from a stream only at site B itahai, while the other three species were each found at two sites. Phylogenetic analysis revealed that the isolates belonged to three ITS clades, one species including six isolates in clade 2, six species including 66 isolates in clade 6 and one species in clade 8. There was a relatively rich species and genetic diversity of P hytophthora detected in the investigated regions where the forest biotic and abiotic factors affecting the growth and evolution of P hytophthora populations were diverse.
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