在可控气氛下生长的棕曲霉Wilhelm产生赭曲霉毒素A的情况。
Ochratoxin A production by Aspergillus ochraceus Wilhelm grown under controlled atmospheres.
作者信息
Paster N, Lisker N, Chet I
出版信息
Appl Environ Microbiol. 1983 Mar;45(3):1136-9. doi: 10.1128/aem.45.3.1136-1139.1983.
When Aspergillus ochraceus NRRL 3174 was grown under controlled atmospheres with 1 and 5% O2 and without CO2, the amount of ochratoxin produced was the same as that produced by the control colonies. Increasing the O2 level up to 40% reduced ochratoxin production by 75%, whereas at 60% O2, ochratoxin production was enhanced. In atmospheres enriched with 10 or 20% CO2, ochratoxin production was reduced when O2 concentrations were below 20% and enhanced when the O2 concentration was 40 or 60% O2. Ochratoxin production was completely inhibited at 30% CO2 and above, regardless of the O2 level. Colony growth was partially inhibited at 60% CO2, and no growth occurred at 80% CO2 or above. However, when colonies inhibited by 60% CO2 or above were subsequently exposed to air, radial growth, number of sclerotia formed, and the amount of ochratoxin produced were the same as in the control colonies. The results indicate that A. ochraceus is tolerant to CO2 concentrations higher than those required to control storage insects.
当赭曲霉NRRL 3174在含1%和5%氧气且无二氧化碳的可控气氛中生长时，产生的赭曲霉毒素量与对照菌落产生的量相同。将氧气水平提高到40%可使赭曲霉毒素产量降低75%，而在60%氧气条件下，赭曲霉毒素产量增加。在富含10%或20%二氧化碳的气氛中，当氧气浓度低于20%时，赭曲霉毒素产量降低，而当氧气浓度为40%或60%时，赭曲霉毒素产量增加。在30%及以上二氧化碳条件下，无论氧气水平如何，赭曲霉毒素的产生均被完全抑制。在60%二氧化碳条件下，菌落生长受到部分抑制，在80%及以上二氧化碳条件下则不生长。然而，当受60%及以上二氧化碳抑制的菌落随后暴露于空气中时，其径向生长、形成的菌核数量以及产生的赭曲霉毒素量与对照菌落相同。结果表明，赭曲霉对高于控制仓储害虫所需浓度的二氧化碳具有耐受性。
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