Genetic, morphological and biochemical investigations of a cryptic species within Aspergillus flavus.

Dee A. Carter, and John I. Pitt.


Independent studies undertaken by Geiser et al (PNAS 95:399-393, 1998) using DNA sequencing, and Tran-Dinh et al (in press) using RAPD analysis, found that isolates of Aspergillus flavus from Australian peanut-growing soils divided into two very distinct groups. In both studies the two groups were uneven, with the larger group (Group 1) containing approximately 70% and 60% of isolates, respectively. A. oryzae isolates also fell into this group, and both groups were distinct from A. parasiticus. The current study was undertaken to investigate the difference between these two groups, and to analyse isolates belonging to the smaller group (Group 2) more thoroughly. Morphological, biochemical and genetic tests were able to clearly separate the two groups. Group 1 appears to be the standard A. flavus, with a ubiquitous distribution, but Group 2 seems restricted in distribution and may represent a new species of Aspergillus.

abstract No: 

Fungal Genet. Newsl. 46 (Supl):

Full conference title: 

Fungal Genetics Conference 20th
    • Fungal Genetics Conference 20th (1999)