Abstract
ABSTRACT Brazilian ecosystems have been intensively exploited for agricultural expansion, however, the diversity of zoosporic organisms in such biomes remains little known. Therefore, further research is required to better understand their role within these ecosystems. Studies with zoosporic fungi were carried out and 22 Allomyces isolates were obtained from soil samples collected at six municipalities from Piauí State. After identification procedures, the taxa were grouped into four species: A. anomalus R. Emers., A. arbusculus E.J. Butler, A. moniliformis Coker & Braxton, and A. neomoniliformis Indoh. A. arbusculus had the highest rate of resistant sporangia viability (10%) and the largest geographical distribution in Piauí, occurring in seven out of ten sites studied. Countrywide, they occur within 14 municipalities from three states. Greater knowledge about the geographical distribution of Allomyces in Brazil is being pioneered in the State of Piauí. Novel information regarding the diversity and occurrence, as well as taxonomic characteristics of the isolates is presented herein.
Highlights
Allomyces is a genus characterized by filamentous mycelium and dichotomous branching
Such genus is represented by several species in the United States, Mexico, Costa Rica, Brazil and Argentina, which indicates a wide geographic distribution in both temperate and tropical regions of the Western Hemisphere
Allomyces is the first genus within the Blastocladiomycota phylum to be reported in Brazil (Wolf 1941), there is lack of information about the diversity and geographic distribution of such taxon (Pires-Zottarelli & Rocha 2010)
Summary
Allomyces is a genus characterized by filamentous mycelium and dichotomous branching It presents planogametes and zoospores with a single posterior flagellum. The genus Allomyces (Blastocladiales) comprises nine species and has very wide geographical distribution, occurring in five continents (Kirk et al.2008). Biodiversity studies of zoosporic organisms, including Blastocladiomycota, in all Brazilian biomes are still very scarce, and the current limited knowledge. Allomyces is the first genus within the Blastocladiomycota phylum to be reported in Brazil (Wolf 1941), there is lack of information about the diversity and geographic distribution of such taxon (Pires-Zottarelli & Rocha 2010).
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