veA Is Required for Toxin and Sclerotial Production in Aspergillus parasiticus
نویسندگان
چکیده
منابع مشابه
Sclerotia Formation and Toxin Production in Large Sclerotial Aspergillus flavus Isolates from Kenya
We studied the relationship between sclerotia formation and aflatoxin production by Aspergillusflavus strains isolated from maize kernels from Nandi County. Isolates recovered from maize kernels were tested for their ability to form sclerotia on different growth media. PCR analysis was done on the isolates to detect 2 structural genes, aflD and aflQ, involved in aflatoxin biosynthesis pathway. ...
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Aspergillus flavus is a saprophytic soil fungus that poses a serious threat worldwide as it contaminates many food and feed crops with the carcinogenic mycotoxin called aflatoxin. This pathogen persists as sclerotia in the soil which enables fungal survival in harsh environmental conditions. Sclerotia formation by A. flavus depends on successful cell communication and hyphal fusion events. Loss...
متن کاملThe Aspergillus nidulans rcoA gene is required for veA-dependent sexual development.
The Aspergillus nidulans rcoADelta mutant exhibits growth and developmental defects. We show that the rcoADelta mutant lacks cleistothecia and is self-sterile. In crosses with wild-type strains, rcoADelta nuclei do not contribute to the cleistothecial walls. Furthermore, sexual development resulting from veA overexpression is rcoA dependent, indicating that rcoA lies downstream of veA in the se...
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Two morphologically different Aspergillus parasiticus strains, one producing aflatoxins, abundant conidia but few sclerotia (BN9) and the other producing O-methyl-sterimatocystin (OMST), copious sclerotia but a low number of conidia (RH), were used to assess the role of crzA which encodes a putative calcium-signaling pathway regulatory protein. Under standard culture conditions, BN9DeltacrzA mu...
متن کاملEffects of Zinc Chelators on Aflatoxin Production in Aspergillus parasiticus
Zinc concentrations strongly influence aflatoxin accumulation in laboratory media and in food and feed crops. The presence of zinc stimulates aflatoxin production, and the absence of zinc impedes toxin production. Initial studies that suggested a link between zinc and aflatoxin biosynthesis were presented in the 1970s. In the present study, we utilized two zinc chelators, N,N,N',N'-tetrakis (2-...
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ژورنال
عنوان ژورنال: Applied and Environmental Microbiology
سال: 2004
ISSN: 0099-2240,1098-5336
DOI: 10.1128/aem.70.8.4733-4739.2004