基于多元变量统计分析法分析1-甲基环丙烯处理对蓝莓果实冷藏品质的影响

The effect of 1-methylcyclopropene treatment on refrigerated quality of blueberry fruit was analyzed based on multivariate statistical analysis

以“夏普蓝”蓝莓果实为实验材料,用添加量分别为0.5、1.0、1.5μL/L的1-甲基环丙烯(1-methylcyclopropene,1-MCP)熏蒸处理,探讨冷藏期间蓝莓果实的品质变化,结合多元变量统计分析法进行综合分析,研究1-MCP对蓝莓果实冷藏品质的影响。结果表明,与对照组相比,1-MCP处理能明显减缓蓝莓果实可滴定酸和维生素C含量的下降,延缓相对电导率和呼吸速率上升,推迟呼吸高峰和乙烯释放高峰出现,延缓多酚氧化酶(polyphenol oxidase,PPO)和过氧化物酶(peroxidase,POD)活性下降,抑制丙二醛(malondialdehyde,MDA)含量上升,能有效延缓蓝莓果实衰老。主成分分析提取出特征值大于1的2个因子,累积方差贡献率达到93.262%,其可以充分反映原始数据的重要信息。相关性分析可知,相对电导率与呼吸强度、乙烯释放量、PPO、POD和MDA含量两两之间呈显著甚至极显著的正相关。根据蓝莓果实冷藏的品质指标,将对照组和处理组进行聚类分析,可区分为3组。综上可知,1.0μL/L 1-MCP熏蒸处理对蓝莓果实采后冷藏品质的效果最佳。

To explore the quality changes of blueberry fruits during cold storage,“Sharp Blue”blueberry fruits were fumigated with 1-methylcyclopropene(1-MCP)at concentrations of 0.5,1.0,and 1.5μL/L,respectively.Combined with multivariate statistical analysis,the effect of 1-MCP on the quality of blueberry fruits during cold storage was studied.Results showed that compared with the control group(CK),1-MCP treatment could significantly maintain the decrease of titratable acid and vitamin C contents,delay the increase of relative conductivity and respiration rate,delay the peak of respiration and ethylene release,and delay the decrease of polyphenol oxidase(PPO)and peroxidase(POD)activities.Inhibiting the increase of malondialdehyde(MDA)content can effectively delay the senescence of blueberry fruit.Principal component analysis extracted two factors with characteristic values greater than 1,and the cumulative variance contribution rate reached 93.262%,which could fully reflect the important information of the original data.Correlation analysis showed that the relative conductivity was significantly positively correlated with respiratory intensity,ethylene release,PPO,POD,and MDA.According to the quality indexes of frozen blueberry fruit,the control group and the treatment group were analyzed by cluster analysis,which could be divided into 3 groups.In conclusion,1.0μL/L 1-MCP fumigationhad the best effect on the postharvest refrigerated quality of blueberry fruits.