Abstract Detail

Mycology

Jumbam, Blaise [1], Zasada, Inga [2], Aime, M. Catherine [3].

Revision of the genus Aureobasidium.

Aureobasidium   Viala & G. Boyer is a dothidealean genus that comprises yeast-like fungi. Members of this genus have recently been grouped into a separate family referred to as Aureobasidiaceae. They are micro- and macroscopically different from their sister Dothideaceae by producing aseptate to septate hyaline spores in deeply buried single locule ascostromata (chasmothecia) that in certain cases burst forth through the surface of the host organs. Species of Aureobasidium are frequently collected in association with plant surfaces, the human body, the aerospace, water, and extreme environments. Currently, there are 36 accepted species of Aureobasidium reported from the Americas, Europe, Australia, the Middle East, Asia, and Africa. While most species of this genus are restricted in their occurrence, the type species (A. pullulans) seems ubiquitous in distribution. Growth type and colony color are taxonomically important attributes in species delimitation.   The colony color ranges from white, through pale pink or greenish brown to black. For this study, we collected new isolates from a wide variety of locations including regions from which the genus had not been previously reported. Sampling was conducted from a variety of substrates including foods, phylloplanes, and plant pathogenic nematode cysts. Samples were maintained in growth media and used for macro- and micromorphological examination, and assimilation profiles. DNA was extracted and sequenced for 4 loci (28S, ITS, EF1a and RPB2). Additionally, we utilized publicly available sequence reads of the ITS region to augment data on distribution and substrate for Aureobasidium species. In total we isolated 121 cultures belonging to 19 species, of which 12 appear to be new to science. One new species was isolated consistently from the cysts of the nematode, Globodera ellingtonae.   G. ellingtonae, a potato cyst nematode has recently been reported from the states of Oregon and Idaho. There is a growing body of literature that recognizes the potential of Aureobasidium species as potential biological control agents of some important agricultural pests. Future work will include bioassays for biocontrol efficacy of this culture in controlling cyst nematodes.

1 - Purdue University, Botany and Plant Pathology, 915 N. 6th St. Apartment 16, Lafayette, IN, 47904, USA
2 - USDA-ARS, Horticultural Crops Research Unit, Corvallis, Oregon, 97330, USA
3 - Purdue University, Department of Botany and Plant Pathology, 915 W. State Street, West Lafayette, IN, 47907, USA

Keywords:
phylogenetics
Multilocus phylogeny
Ecology
Systematics
Genealogical concordance
Mycology.

Presentation Type: Poster
Session: MYP1, Mycology Posters I
Location: /
Date: Monday, July 19th, 2021
Time: 5:00 PM(EDT)
Number: MYP1006
Abstract ID:557
Candidate for Awards:MSA Best Poster Presentation Award by a Graduate Student