2 5 3 3
Home About us MoEF Contact us Sitemap Tamil Website  
About Envis
Whats New
Research on Microbes
Microbiology Experts
Online Submission
Access Statistics

Site Visitors

blog tracking

Fungal Genetics and Biology
Vol. 30 (1), 2017, Pages: 17-32

A Molecular Phylogeny of Phytophthora and Related Oomycetes

D.E.L. Cooke, J.M. Duncan, G. Wagels, C.M. Brasier

Scottish Crop Research Institute, Invergowrie, Dundee, DD2 5DA, United Kingdom.


Phylogenetic relationships among 50 Phytophthora species and between Phytophthora and other oomycetes were examined on the basis of the ITS sequences of genomic rDNA. Phytophthora grouped with Pythium, Peronospora, and Halophytophthora, distant from genera in the Saprolegniales. Albugo was intermediate between these two groups. Unlike Pythium, Phytophthora was essentially monophyletic, all but three species forming a cluster of eight clades. Two clades contained only species with nonpapillate sporangia. The other six clades included either papillate and semipapillate, or semipapillate and nonpapillate types, transcending traditional morphological groupings, which are evidently not natural assemblages. Peronospora was related to P. megakarya and P. palmivora and appears to be derived from a Phytophthora that has both lost the ability to produce zoospores and become an obligate biotroph. Three other Phytophthoras located some distance from the main Phytophthora–Peronospora cluster probably represent one or more additional genera.

Keywords: evolution; rDNA; internal transcribed spacers; ITS; Pythium; Peronospora.

Copyright © 2005 ENVIS Centre ! All rights reserved
This site is optimized for 1024 x 768 screen resolution