发光杆菌可湿性粉剂的研制及对荔枝采后贮藏的影响

Preparation of Photorhabdus luminescens wettable powder formulation and its effects on postharvest storability of litchi

为了研制发光杆菌可湿性粉剂,探讨其在荔枝采后贮藏中的应用,通过测定不同助剂与发光杆菌的生物相容性及其对制剂性能的影响,结合正交试验确定可湿性粉剂的最佳配方,研究了喷施菌剂对荔枝果实腐烂指数和商品率的影响。结果表明:发光杆菌可湿性粉剂的最佳配方为载体硅藻土40%、润湿剂茶枯粉4%、分散剂羧甲基纤维素钠6%、保护剂糊精0.2%。以此配方制备的菌剂的活菌数大于5.0×108CFU/g,pH值6.8,润湿时间51 s,悬浮率74.83%,水分含量2.87%,细度通过率98.52%,产品各项指标均达到国家标准;喷施菌剂处理显著降低荔枝果实的腐烂指数(仅为0.13),提高果实的商品率。

In order to prepare the wettable powder formulation of Photorhabdus luminescens and apply it to the postharvest storability of litchi,the optimal pesticide adjuncts tested were screened based on the effects of adjuncts on microbial activity and formulation properties using orthogonal test,and its effects on the postharvest storability of litchi were investigated.The optimal formulation were confirmed as follows:the content of filler diatomite,wetting agent Chaku powder,dispersing agent CMC-Na,UV protection agents dextrin were40%,4%,6%and0.2%,respectively.The quality of this formulation showed that the bacterial count of P.luminescens wettable powder could come up to5.0×108CFU/g,and pH value was6.8,wetting time was51s,suspension rate was74.83%,and moisture content was2.87%which came up to the formulation standard.Spraying with P.luminescens wettable powder could significantly lessening the decay index(0.13)and increase the commodity rate of litchi.