Mycotoxigenic potential of Aspergillus flavus strains isolated from groundnuts growing in Israel

שלום

עברית

מדריך מקוצר למשתמש מדריך מפורט למשתמש

חפש...

הספר "אוצר וולקני"

אודות

תנאי שימוש

פותח על ידי קלירמאש פתרונות בע"מ -

Mycotoxigenic potential of Aspergillus flavus strains isolated from groundnuts growing in Israel

Year: 

1993

Source of publication :

Mycopathologia

Authors :

ליסקר, נורברטו

;

מיכאלי, רינה

;

פרנק, זאב

.

Volume :

122

Co-Authors: 

Lisker, N., Department of Agronomy and Natural Resources, The Volcani Center, Agricultural Research Organization, Bet Dagan, Israel
Michaeli, R., Department of Agronomy and Natural Resources, The Volcani Center, Agricultural Research Organization, Bet Dagan, Israel, Department of Plant Pathology, The Volcani Center, Agricultural Research Organization, Bet Dagan, Israel
Frank, Z.R., Department of Plant Pathology, The Volcani Center, Agricultural Research Organization, Bet Dagan, Israel

From page: 

177

To page: 

183

(

Total pages: 

7

)

Link :

Mycotoxigenic potential of Aspergillus flavus strains isolated from groundnuts growing in Israel

Abstract: 

Two hundred strains of the Aspergillus flavus group isolated from groundnuts (peanuts) growing in Israel were examined for their ability to produce mycotoxins in potato dextrose (PD) broth. Almost 77% of the isolates produced aflatoxin; aflatoxins B1 and B2 were formed by most of the isolates. Simultaneous production of aflatoxins of groups B and G was detected in only 0.5% of the isolates. Microscopic examination revealed that 98% of the isolates were A. flavus and only 2%A. parasiticus. Cyclopiazonic acid (CPA) was detected in 22.5% of the isolates, including 3.5% that produced only CPA. Sterigmatocystin was detected in only 2% of the isolates and only one isolate produced aflatoxin simultaneously with CPA and sterigmatocysin. The dry weight (DW) of mycelium, 7 days after inoculating the medium, was between 71-110 mg/30 ml medium in more than 70% of the isolates. A general decrease in the pH was observed and 75% of the isolates reduced the pH to 4.5 or below. After 14 days, a small increase in DW and an increase in the pH toward neutrality was observed. On PD agar, 30% of the isolates produced sclerotia, including 5% that produced them profusely. No correlation between mycelial growth, changes in pH of the medium, sclerotium formation, and aflatoxin accumulation could be observed. The mycotoxigenic potential of the A. flavus strains isolated from groundnuts seems to be relatively high and may present a potential threat to human and animal health. © 1993 Kluwer Academic Publishers.