长足大竹象幼虫肠道纤维素酶活性研究A Study of Cellulase Activity in Intestine Tract of Cyrtotrachelus bugueti Larvae
何慧,叶垚君,杨瑶君,付春
HE Hui,YE Yaojun,YANG Yaojun,FU Chun
摘要(Abstract):
将长足大竹象幼虫肠道分为前中后三段,研究长足大竹象幼虫在不同pH值、不同温度的交互作用下不同段肠道中的不同纤维素酶的活性,为了探索其肠道中酶活的最佳pH值和最佳温度。结果表明:后段肠道的纤维素酶活性最高;外切-β-1,4-葡聚糖苷酶的酶活性的最适温区为50℃-60℃(0.03±0.005μmol·min~(-1)·mg~(-1)),最适pH值为5~6(0.02±0.005μmol·min~(-1)·mg~(-1));内切-β-1,4-葡聚糖苷酶的最适温区为50~60℃(0.023±0.05μmol·min~(-1)·mg~(-1)),最适pH值为4~7(0.025±0.005μmol·min~(-1)·mg~(-1));β-葡萄糖苷酶的最适温区为40~60℃(0.02±0.05μmol·min~(-1)·mg~(-1)),最适pH值为4~7(0.02±0.05μmol·min~(-1)·mg~(-1))。温度和pH值对昆虫肠道内纤维素酶活性的影响显著。
In order to explore the optimal pH value and temperature of the enzyme activity in the intestinal tract of Cyrtotrachelus buqueti larvae, different cellulase activities in different segments of intestinal tract(foregut, midgut,hindgut) were carried out under the interactions of different pH values and different temperatures. The optimum temperature range of exo-β-1,4-glucosidase activity was 50-60 ℃(0.03 ± 0.005 μmol·min~(-1)·mg~(-1)), and the optimum pH was 5-6(0.02 ± 0.005 μmol·min~(-1)·mg~(-1)). The optimum temperature range of endo-β-1,4-glucosidase activity was 50-60 ℃(0.23 ± 0.005μmol·min~(-1)·mg~(-1)), and the optimum pH was 4-7(0.02 ± 0.005 μmol·min~(-1)·mg~(-1)). The optimum temperature range of β-glucanase activity was 40-60 ℃(0.02 ± 0.005 mol~(-1)·mg~(-1)), and the optimum pH was 4-7(0.02 ±0.05 μmol·min~(-1)·mg~(-1)). Temperature and pH had significant effects on cellulase activity in the insect intestinal tract.
关键词(KeyWords):
长足大竹象;消化道;纤维素酶
Cyrtotrachelus buqueti;Digestive tract;Cellulase
基金项目(Foundation): 国家自然科学基金面上项目(31470655);; 乐山市科技局重点研究项目(18JZD101);; 乐山师范学院人才启动项目(XJR17005);; 竹类病虫防控与资源开发四川省重点实验室开放项目(17ZZ019)
作者(Author):
何慧,叶垚君,杨瑶君,付春
HE Hui,YE Yaojun,YANG Yaojun,FU Chun
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