Hybridization between Aspergillus flavus and Aspergillus parasiticus

Ref ID: 18389

Author:

Carolyn J. Worthington , Bruce W. Horn , Geromy G. Moore , James T.
Monacell , Rakhi Singh , Eric A. Stone , Ignazio Carbone

Author address:

Plant Pathology, NCSU, Raleigh, NC 27695 NPRL, USDA-ARS, Dawson, GA 39842
BRC, NCSU, Raleigh, NC 27695 Genetics, NCSU, Raleigh, NC 27695

Full conference title:

Asperfest 8

Abstract:

To date the sexual stages or teleomorphs have been described for three aflatoxigenic species in Aspergillus section Flavi: Petromyces flavus, P. parasiticus
and P. nomius. In this study we examined the possibility of interspecific matings between A. flavus and A. parasiticus. These species can be distinguished
morphologically and genetically, as well asfunctionally via the biosynthesis ofspecific aflatoxins and an unrelated mycotoxin, cyclopiazonic acid (CPA).
A. flavus produces both B aflatoxins and CPA, B aflatoxins or CPA alone, or neither mycotoxin; A. parasiticus produces B and G aflatoxins or Omethylsterigmatocystin but not CPA. Only four out of forty-five attempted interspecific crosses between compatible mating types of A. flavus and A.
parasiticus were fertile. Single ascospore strains from each cross were isolated and shown to be hybrids using array comparative genome hybridization
and multi
1 2 1 2
locus sequence typing. Higher mean concentrations of B , B , G and G aflatoxins, and CPA in the F1 progeny compared to midpoint parent
toxin levels indicate high heritability of these toxins and possibly hybrid heterosis

Abstract Number: 69)

Conference Year: 2011

Link to conference website: NULL

New link: NULL

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