Mycobiology.  2017 Sep;45(3):123-128. 10.5941/MYCO.2017.45.3.123.

Bipolaris marantae sp. nov., A Novel Helminthosporoid Species Causing Foliage Blight of the Garden Plant Maranta leuconeura in Brazil

• Lourenço
• Alves JL
• Guatimosim E
• Colman A
• Barreto RW

• KMID: 2425126
• DOI: http://doi.org/10.5941/MYCO.2017.45.3.123

Abstract

A 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.

Keyword

Asexual morph; Ornamental; Pathogens; Phylogeny; Pleosporales; Taxonomy

MeSH Terms

Agriculture*
Brazil*
Classification
Fungi
Germination
Marantaceae*
Mitosporic Fungi
Phylogeny
Plants*
Spores, Fungal
Virulence