Mycologia (2011) 103, 341-350

Z. Gloria Abad, Kelly L. Ivors, Courtney A. Gallup, Jorge A. Abad and H. David Shew (2011)
Morphological and molecular characterization of Phytophthora glovera sp. nov. from tobacco in Brazil
Mycologia 103 (2), 341-350
Abstract: A root rot disease of cultivated tobacco called yellow stunt has been observed in the burley tobacco production areas of Brazil since the early 1990s. Root infecting fungi and straminipiles were isolated from the roots of diseased tobacco plants, including a semi-papillate, homothallic, slow growing Phytophthora species. Pathogenicity trials confirmed that Phytophthora sp. caused root rot and stunting of burley and flue-cured tobaccos. Morphological characteristics of the asexual and sexual stages of this organism did not match any reported Phytophthora species and were very different from the widely known tobacco black shank pathogen P. nicotianae. Phylogenetic analysis based on sequences of the internal transcribed spacer rDNA, β-tubulin and translation elongation factor 1- regions indicated that this organism represents a previously unreported Phytophthora species that is significantly supported in clade 2 and most closely related to P. capsici. However P. glovera differs from P. capsici in a number of morphological characters, most significantly P. glovera is homothallic and produces both paragynous and amphigynous antheridia while P. capsici is heterothallic and produces only amphigynous antheridia. In this paper we confirmed pathogenicity of this species on tobacco and describe the morphological and molecular characteristics of Phytophthora glovera sp. nov.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): David Shew, Courtney A. Gallup

Research topic(s) for pests/diseases/weeds:
identification/taxonomy
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Phytophthora glovera	Tobacco (Nicotiana tabacum)