6-酮型螺甾烷类化合物对‘徐香’猕猴桃采后贮藏品质的影响

Effect of 6-keto spirostane on quality of ‘Xuxiang’ kiwifruit during storage

以‘徐香’猕猴桃为材料,研究了3种处理对猕猴桃贮藏期间果实品质的影响,采用主成分分析法确定了果实的最佳食用期。盛花期后15 d分别以10.0 mg/L氯吡脲(forchlorfenuron,CPPU)、0.500 mg/L拉肖皂苷元(laxogenin,LA)、0.500 mg/L 3,6-二羰基螺甾烷(3,6-dicarbonyl spirostane,3,6-TCS)浸果结合喷施处理猕猴桃植株,清水作为对照,研究了不同处理对猕猴桃贮藏期间果实品质的影响,采用主成分分析法确定了果实的最佳食用期。结果表明3种处理均能改善‘徐香’猕猴桃的品质,提高果实中可溶性蛋白的含量及糖度,加快酸类物质的分解,提高了果实中的糖酸比,有益于维生素C的保留。通过主成分综合评价值发现,贮藏时间对猕猴桃贮藏期品质的影响起到决定性的作用,随着贮藏时间的延长,4℃下所有处理果品质呈现出先高后低的趋势,贮藏21 d后可开始食用,49 d时果品品质最佳,且最宜食用期为42~49 d,以食品安全角度考虑,LA处理49 d为最优处理。

Spirostane compounds,laxogenin(LA),and 3,6-dicarbonyl spirostane(3,6-TCS) bearing structure of the carbonyl group at C_(6) present plant growth activity as brassinosteroids(BRs).In this study,‘Xuxiang' kiwifruits were used as materials to study the effects of spaying kiwifruit with 10.0 mg/L forchlorfenuron(CPPU),0.500 mg/L LA,and 0.500 mg/L 3,6-TCS after flowering and storage quality,a control treatment was performed using water.The method of principal component analysis(PCA) was determined to ensure the best edible period of kiwifruit.Results showed that compared with the control group,three plant growth regulators could also improve the quality,increase the content of soluble protein and sugar,accelerate the decomposition of titratable acid,enhance the sugar-acid ratio,and were beneficial to retention of vitamin C in different degrees.It was found that the storage time played a decisive role in the quality of kiwifruit by PCA,with the storage duration,the kiwifruit quality of three treatments exhibited increased firstly and then decreased.The fruits began to be eaten at 21 days and the fruit quality was the best at 49-day storage.The best editable period was from 42 days to 49 days.In terms of food safety,LA treatment for 49 days is the optimal treatment.