Barros G, Chiotta M L, Torres A, Chulze S
Departamento de Microbiología e Inmunología, Facultad de Ciencias Exactas Físico Químicas y Naturales, Universidad Nacional de Río Cuarto, Río Cuarto, Córdoba, Argentina.
Lett Appl Microbiol. 2006 Jun;42(6):560-6. doi: 10.1111/j.1472-765X.2006.01878.x.
The aims of this work were to identify potential sources of Aspergillus parasiticus inoculum and to evaluate the sclerotial and toxigenic profiles of this species from the peanut agroecosystem in Argentina. Likewise, the genetic diversity of A. parasiticus population was analysed using vegetative compatibility group (VCG) analysis.
The A. parasiticus strains were isolated from soil, debris and peanut seeds in Córdoba Province, Argentina. A. parasiticus was recovered from the three sources analysed. Only 11 of 185 A. parasiticus isolates (5.9%) did not produce aflatoxins, while 57% produced sclerotia. Twenty-four VCG were identified from 63 isolates. The VCG diversity index for A. parasiticus, expressed as the number of groups divided by the total number of isolates, was 0.31. In general, there were significant differences among VCG in aflatoxin production.
The presence of aflatoxigenic strains of A. parasiticus in the three substrates suggests that they may be an important source of aflatoxin in Argentina's peanut agroecosystem. The A. parasiticus population shows a low genetic diversity.
The present study showed data on inoculum distribution, aflatoxin and sclerotia production and genetic diversity in an A. parasiticus population isolated from the peanut agroecosystem in Argentina.
本研究旨在确定寄生曲霉接种体的潜在来源，并评估来自阿根廷花生农业生态系统中该物种的菌核和产毒特性。同样，使用营养体亲和群（VCG）分析来分析寄生曲霉种群的遗传多样性。
从阿根廷科尔多瓦省的土壤、残体和花生种子中分离出寄生曲霉菌株。在分析的三种来源中均分离到寄生曲霉。185株寄生曲霉分离株中只有11株（5.9%）不产生黄曲霉毒素，而57%产生菌核。从63株分离株中鉴定出24个VCG。寄生曲霉的VCG多样性指数（以菌群数量除以分离株总数表示）为0.31。总体而言，不同VCG在黄曲霉毒素产生方面存在显著差异。
在三种基质中均存在产黄曲霉毒素的寄生曲霉菌株，这表明它们可能是阿根廷花生农业生态系统中黄曲霉毒素的重要来源。寄生曲霉种群显示出较低的遗传多样性。
本研究展示了从阿根廷花生农业生态系统中分离出的寄生曲霉种群的接种体分布、黄曲霉毒素和菌核产生情况以及遗传多样性的数据。
