Navegando por Autor "Colman, Adans"
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Item Bipolaris marantae sp. nov., a novel Helminthosporoid specis causing foliage blight of the garden plant Maranta leuconeura in Brazil(Mycobiology, 2017-06-23) Lourenço, Carla Cristina Gomes; Alves, Janaina Lana; Guatimosim, Eduardo; Colman, Adans; Barreto, Robert WeingartA severe leaf spot, turning to foliage blight, was observed on leaves of Maranta leuconeura growing in a garden in Brazil (state of Rio de Janeiro) in 2015. A dematiaceous hyphomycete bearing a morphology typical of a helminthosporoid fungi was regularly found in association with diseased tissues. The fungus was isolated and pathogenicity was demonstrated through the completion of Koch's postulates. A morphology and molecular analysis led to the conclusion that the fungus belonged to the genus Bipolaris, which is characterized by having fusiform conidia, externally thickened and truncate hila and a bipolar pattern of germination. Additionally, homology of internal transcribed spacer and GAPDH sequences with sequences of other Bipolaris species, confirmed its generic placement. A phylogenetic study also indicated clearly that the fungus on M. leuconeura is phylogenetically distinct from related species of this genus, leading to the proposal of the new species Bipolaris marantae.