为进行番茄罐头生产过程中腐败真菌的溯源分析,采用MGISEQ-2000高通量测序技术,对不同生产时间和不同阶段收集的46份样品的真菌转录间隔区基因进行测序,全面解析番茄罐头生产过程中真菌群落结构的变化和关键物种差异。采用纯培养技术,结合多相鉴定技术,对番茄罐头生产过程中的真菌进行大规模分离与鉴定,确定分离菌株的准确分类学地位。在此基础上,通过回接实验和菌株分型分析,确定番茄罐头生产加工过程中的关键腐败真菌及其来源。研究结果表明,46个样品共注释到5 236个操作分类单元,随着生产的持续进行,真菌群落结构的多样性降低,假丝酵母属(Candida)成为潜在的腐败真菌;通过纯培养技术共获得72株真菌,其中热带假丝酵母(Candida tropicalis)是主要潜在腐败真菌,占分离总数的27.78%。回接实验和溯源分析结果表明,热带假丝酵母是引起番茄罐头胀气变质的腐败真菌,并广泛分布于生产的全过程。
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