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首页> 外文期刊>Food microbiology >Effect of intra and interspecific interaction on OTA production by A. section Nigri in grapes during dehydration
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Effect of intra and interspecific interaction on OTA production by A. section Nigri in grapes during dehydration

机译：种内和种间相互作用对葡萄脱水过程中黑曲霉产OTA的影响

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摘要

The aim of this study was to assess the colonizing capability and OTA production of different populations of Aspergillus section Nigri spp. in grapes, as affected by the interactions with other fungi, during a simulated in vitro sun-drying. Mature white grapes were divided into two lots of healthy and artificially injured grapes and inoculated with A. section Nigri spp. (A. carbonarius OTA producer, A. niger aggregate OTA producer, A. niger aggregate OTA non-producer), Eurotium amstelodami and Penicillium janthinellum, in different combinations. The drying process was simulated adjusting water activity firstly at 0.98 a_w and gradually decreasing it to 0.76 a_w for a total of 20 days. Colonizing grape percentages were recorded after 5, 10, 15 and 20 days of dehydration and OTA content was measured after 5, 7, 10, 12, 15, 17 and 20 days. Colonization of grapes increased with time in all treatments. A. niger aggregate OTA-positive showed the highest colonization percentage, followed by A. carbonarius, and finally their mixed inoculum. When the two OTA-producing strains were combined, addition of any other microorganism increased the percentage of infection by A. section Nigri. A. carbonarius was the highest OTA producer in pure culture, followed by A. niger aggregate OTA-positive. In general, when competing fungi were added to A. carbonarius inoculum, the OTA content was reduced. E. amstelodami was the only competing fungus which increased OTA accumulation. The sun-drying process may be conducive to OTA accumulation in dried grapes. The complex fungal interactions which may take place during this process, may act as an additional control factor, given that the higher presence of A. niger aggregate OTA-negative inhibits OTA accumulation by OTA producing species.
机译：这项研究的目的是评估Nigri spp黑曲霉不同种群的定殖能力和OTA产生。模拟的体外日晒过程中，由于与其他真菌的相互作用而受到影响。成熟的白葡萄被分为两部分健康和人为伤害的葡萄，并分别接种了A. Nigri spp。 （A. carbonarius OTA生产者，A。niger总OTA生产者，A。niger总OTA非生产者），am Amstelodami和Penicillium janthinellum，处于不同的组合。模拟干燥过程，首先将水分活度调整为0.98 a_w，然后逐渐降低至0.76 a_w，共20天。在脱水5、10、15和20天后记录葡萄定植百分比，并在5、7、10、12、15、17和20天后测量OTA含量。在所有处理中，葡萄的定植随时间增加。黑曲霉总OTA阳性显示最高的定殖百分比，其次是碳曲霉，最后是混合接种物。当将两种产生OTA的菌株组合在一起时，添加任何其他微生物都会增加黑曲霉的感染率。 A. carbonarius是纯培养中最高的OTA产生者，其次是黑曲霉总OTA阳性。通常，当将竞争性真菌添加到碳曲霉接种物中时，OTA含量会降低。 Es amstelodami是增加OTA积累的唯一竞争性真菌。晒干过程可能有助于OTA在葡萄干中积累。考虑到黑曲霉聚集体OTA阴性的较高存在会抑制OTA产生物种的OTA积累，因此在此过程中可能发生的复杂真菌相互作用可能是一个附加的控制因素。

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