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United States Department of Agriculture

Agricultural Research Service

Title: Phylogenetic Relationships of Phytophthora Ramorum and a Phytophthora Ilicis-Like Species Associated with Sudden Oak Death in California


Submitted to: Mycological Research
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: October 13, 2003
Publication Date: December 20, 2003
Citation: Martin, F.N., Tooley, P.W. 2003. Phylogenetic relationships of phytophthora ramorum and a phytophthora ilicis-like species associated with sudden oak death in california. Mycological Research. v. 107. p. 1379-1391.

Interpretive Summary: Sudden Oak Death has been an emerging disease problem in coastal California and has caused significant losses in forest ecosystems in some regions of the state. Phytophthora ramorum, the causal agent of this disease, and a P. ilicis-like species that is recovered from some symptomatic plants were examined to determine their phylogenetic relationship with other species in the genus by sequence alignment of the mitochondrially-encoded cytochrome oxidase II gene and the nuclear encoded rDNA internal transcribed spacer region. P. ramorum was most closely related to P. hibernalis and P. lateralis while the P. ilicis-like species was most closely related to P. ilicis. Both P. ramorum and the P. ilicis-like species represented distinct species and were not likely the result of interspecific crosses between species. The results will help other scientists better understand the relationships among these pathogens and other members of the genus. Also, the DNA sequence information obtained may be used to develop identification and detection methods for these pathogens.

Technical Abstract:

Last Modified: 7/28/2014
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