纳他霉素对冬枣浆胞病菌的毒力及保鲜生理效应研究

研究了不同浓度纳他霉素对冬枣浆胞病菌Alternaria Nees ex Wallr.的室内毒力以及对冬枣低温贮藏期间生理生化指标的影响。结果表明,纳他霉素对冬枣浆胞病菌的EC50和EC90值分别为39.56和208.48 mg/L,与对照药剂咪鲜胺、异菌脲相比,EC90值无显著差异;经500~1 000 mg/L 的纳他霉素处理可显著抑制冬枣丙二醛(MDA)含量的增加,并使多聚半乳糖醛酸酶(PG)与苯丙氨酸解氨酶(PAL)的活性提高,对保持果实硬度有很好的效果,并且抑制了可溶性固形物、抗坏血酸(Vc)含量的下降。经1 000 mg/L纳他霉素处理的冬枣贮藏到60 d其商品率达87.3%,高于对照组的商品率(72.9%);贮藏到100 d其商品率仍可达到75.0%,显著高于对照组(50.2％)。

The Toxicity of Natamycin to Alternaria Nees ex Wallr.and Physiological Activity of Fresh-keeping Dong Jujube Using Natamycin Treatments

The toxicity of natamycin to Alternaria Nees ex Wallr.was tested in laboratory and the effects on physiological activities and biochemical attributes of Dong jujube fruit during low temperature storage were studied,and suitable concentration for storage of Dong jujube fruit were screened.The results showed that the EC_(50) and EC_(90) value of natamycin to Alternaria Nees ex Wallr.were 39.56 and 208.5 mg/L,respectively.The EC_(90) value of natamycin showed no significant differences with that of iprodione and myclobutanil.Natamycin at 500~1 000 mg/L could inhibit the fortification of MDA,increase the activity of PG and PAL,and it had the best effects on keeping the firmness,and inhibit the decline of soluble solid content and Vc content of Dong jujube.After treated with natamycin and stored for 60 and 100 days,the commodity rate of Dong jujube were 87.3% and 75.0% respectively,which were significantly higher than those of the control.