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Comparison of host range and pathogenicity of isolates of Pythium myriotylum and Pythium zingiberis

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Le, D. P., Aitken, E. A. B. and Smith, M. K. (2015) Comparison of host range and pathogenicity of isolates of Pythium myriotylum and Pythium zingiberis. In: Acta Horticulturae.

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Article Link: http://dx.doi.org/10.17660/ActaHortic.2015.1105.7


Apart from morphology and genetic characteristics, species status of Pythium zingiberis and P. myriotylum may also be confirmed based on their pathogenicity and host range. An Australian putative P. zingiberis isolate and imported type isolates of P. myriotylum and P. zingiberis were subject to both in vitro and in vivo pathogenicity tests. In vitro tests were carried out on excised carrot, ginger, potato, radish, and sweet potato tuber/root sections, and on seeds and seedlings of cucumber, cauliflower, millet, rye, sweet corn, tomato, and wheat. In all assays conducted, the Australian isolate was found to be the most pathogenic, followed by type specimen of P. zingiberis (UOP 275), and then the type specimen P. myriotylum (CBS 254.70). An in vivo experiment on ginger plants at 35°C (with 10 h day light) in quarantine conditions showed that the ginger plants inoculated with the Australian isolate and also the type specimen of P. zingiberis died at 21 days after inoculation, whereas those inoculated with P. myriotylum CBS 254.70 were still green and healthy. Along with cardinal growth rate, the Australian isolate was confirmed to be closely related to P. zingiberis. This is also the first direct comparison in pathogenicity of P. zingiberis and P. myriotylum.

Item Type:Conference or Workshop Item (Paper)
Business groups:Horticulture and Forestry Science
Keywords:Aggressiveness Disease severity Ginger Pythium soft rot Zingiber officinale
Subjects:Plant pests and diseases > Plant pathology
Plant pests and diseases > Pest control and treatment of diseases. Plant protection
Live Archive:29 Jul 2016 04:16
Last Modified:03 Sep 2021 16:50

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