Resumo

CASTILLO, L. A.; BIANCHINOTTI, M. V.  e  MURRAY, M. G.. Seasonal variation of Helicogermslita (Xylariaceae) ascospores in the atmosphere of Bahía Blanca city, Argentina. Polibotánica [online]. 2020, n.49, pp.173-184.  Epub 20-Jun-2020. ISSN 1405-2768.  https://doi.org/10.18387/polibotanica.49.12.

The genus Helicogermslita was registered in several European countries, India, New Zeeland, South Africa and Chile. While the natural habitat of the species are plant substrates, in Argentina ascospores from Helicogermslita were observed in air samples from Bahía Blanca city. Members of Xylariaceae are recognized as plant pathogens, endophytes or wood decomposers. The aim of this work was to identify the spore type named after Helicogermslita and to analyze its dynamics of dispersion in Bahía Blanca atmosphere. Samples were taken weekly with a Lanzoni sampler (Hirst methodology) located in a residential area 15 meters high. Daily and schedules data of the concentration from Helicogermslita spores were analyzed during 2016. The annual index of Helicogermslita spore type was of 145 spores/m3, that represented 0.02% in relation to the total fungal spores found. The highest values were observed in summer and fall, while winter turned out to be the least represented season. The statistical analyses showed a relationship between the appearance of spores and some meteorological parameters, the relative humidity was the most important factor responsible of the increase in concentration of spores with a significant positive correlation. These ascospores were identified as H. cf. celastri. The site of origin of the spores could not be established.

Palavras-chave : air; fungal spores; Ascomycota; Hirst sampler; aerobiology.

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