Skip to Main Content
Phytophthora taxa associated with cultivated Agothosmo, with emphasis on the P. citricola complex and P. capensis sp. nov.Author(s): C.M. Bezuidenhout; S. Deman; S.A. Kirk; W.J. Botha; L. Mostert; A. McLeod
Source: Persoonia 25: 32-49
Publication Series: Scientific Journal (JRNL)
View PDF (1.48 MB)
DescriptionAgathosma species, which are indigenous to South Africa, are also cultivated for commercial use. Recently growers experienced severe plant loss, and symptoms shown by affected plants suggested that a soilborne disease could be the cause of death. A number of Phytophthora taxa were isolated from diseased plants, and this paper reports their identity, mating type, and pathogenicity to young Agathosma plants. Using morphological and sequence data seven Phytophthora taxa were identified: the A1 mating type of P. cinnamomi var. cinnamomi, P. cinnamomi var. parvispora and P. cryptogea, the A2 mating type of P. drechsleri and P. nicotianae, and two homothallic taxa from the P. citricola complex. The identity of isolates in the P. citricola complex was resolved using reference isolates of P. citricola CIT groups 1 to 5 sensu Oudemans et al. (1994) along with multi-locus phylogenies (three nuclear and two mitochondrial regions), isozyme analyses, morphological characteristics and temperature-growth studies. These analyses revealed the isolates from Agathosma to include P. multivora and a putative novel species, P. taxon emzansi. Furthermore, among the P. citricola reference isolates the presence of a new species was revealed, described here as P. capensis. Findings of our study, along with some recent other studies, have contributed to resolving some of the species complexity within the P. citricola complex, resulting in the identification of a number of phylogenetically distinct taxa. The pathogenicity of representative isolates of the taxa from Agathosma was tested on A. betulina seedlings. The putative novel species, P. taxon emzansi, and P. cinnamomi var. parvispora were non-pathogenic, whereas the other species were pathogenic to this host.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationBezuidenhout, C.M.; Deman, S.; Kirk, S.A.; Botha, W.J.; Mostert, L.; McLeod, A. 2010. Phytophthora taxa associated with cultivated Agothosmo, with emphasis on the P. citricola complex and P. capensis sp. nov. Persoonia 25: 32-49. DOI: 10.3767/003158510X538371
- Phytophthora taxa associated with cultivated Agathosma, with emphasis on the P. citricola complex and P. capensis sp. nov.
- Phytophthora community structure analyses in Oregon nurseries inform systems approaches to disease management
- Evaluation of chemical and biological agents for control of Phytophthora species on intact plants or detached leaves of rhododendron and lilac
XML: View XML