深绿木霉SS003产胞壁降解酶发酵条件的响应面优化

Optimizing fermentation conditions for cell wall degrading enzymatic production from Trichoderma atroviride SS003 by response surface method

  • 摘要: 【目的】优化深绿木霉(Trichoderma atroviride)SS003菌株在真菌细胞壁诱导下产β-葡聚糖酶和几丁质酶的培养条件,为其生防机理研究奠定基础。【方法】设置不同培养温度(24、26、28、30、32、34℃)、培养时间(24、48、72、96、120、144、168 h)和初始接种量(3~9块菌块)分别进行单因素诱导SS003菌株产胞壁降解酶发酵条件优化试验;根据单因素优化结果,利用Design-Expert 8.05b中的Box-Behnken中心组合设计原理,对培养温度、培养时间、初始接种量对SS003菌株产酶培养条件进行响应面分析优化。【结果】SS003菌株在诱导培养下产β-葡聚糖酶的最优培养条件为:培养时间73.70 h、培养温度27.82℃、初始接种量5.19块菌块;几丁质酶的最优培养条件为:培养时间82.91 h、培养温度27.70℃、初始接种量5.03块菌块。【结论】响应面法可用于深绿木霉SS003菌株产胞壁降解酶优化条件的筛选,能有效提高深绿木霉SS003产β-葡聚糖酶和几丁质酶的产酶量。

     

    Abstract: ObjectiveThe fermentation conditions of β-glucanase and chitinase production from T. atroviride were optimized to provide references for the research on its biocontrol mechanism. MethodThree independent variables were selected for single factor test , which were incubation time ( 24 , 48 , 72 , 96 , 120 , 144 , 168 hours ) , culture temperature ( 24 , 26 , 28 , 30 , 32 , 34 ℃) and initial inoculums size ( 3 , 4 , 5 , 6 , 7 , 8 , 9 pieces ) . Based on single factor optimization results , response surface method was used to optimize the above conditions in line with Box-Behnken principle of De-sign-Expert 8.05 b. ResultThe optimum conditions for β-glucanase were obtained which were incubation time of 73.70 hours, culture temperature at 27.82 ℃ and initial inoculums size of 5.19 pieces. For chitinase, the optimum conditions were incubation time of 82.91 hours, culture temperature at 27.70 ℃ and initial inoculums size of 5.03 pieces. Con-clusionDue to its effectiveness in boosting quantity of β-glucanase and chitinase from Trichoderma atroviride SS003 , response surface method should be employed to optimize the fermentation conditions for cell wall degrading enzymatic production.

     

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