【摘要】 为阐明绿僵菌与昆虫免疫抑制蛋白的增效机理，采用浸渍法测定昆虫免疫抑制蛋白FKBP52与金龟子绿僵菌Metarhizium anisopliae对西花蓟马Frankliniella occidentalis的毒力和其体内羧酸酯酶（carboxylesterase,CarE）、谷胱甘肽-S转移酶（glutathione-S transferase,GST）、酚氧化酶（phenoloxidase,PO）及几丁质酶活性的变化。结果显示，金龟子绿僵菌和FKBP52蛋白联合使用对西花蓟马的致死中时LT50为7.32 d，优于绿僵菌单用（10.87 d）或FKBP52蛋白单用的（14.15 d）。金龟子绿僵菌和FKBP52蛋白联合使用9 d时，西花蓟马的累计死亡率达81.11%，显著高于绿僵菌单用（45.56%）或FKBP52蛋白单用的（36.67%）；金龟子绿僵菌和FKBP52蛋白联合使用的协同毒力指数为24.10，表现为增效作用。金龟子绿僵菌与FKBP52蛋白联合使用1 d后，西花蓟马体内CarE和PO活性小于金龟子绿僵菌单用后的活性；联合使用2 d后，西花蓟马体内几丁质酶活性小于绿僵菌单用后的活性，而CarE和GST活性均大于金龟子绿僵菌单用后的活性；联合使用3 d后，西花蓟马体内几丁质酶、CarE和PO活性均大于绿僵菌单用后的活性。表明与金龟子绿僵菌单用相比，金龟子绿僵菌和FKBP52蛋白联合使用后西花蓟马体内CarE、GST、PO和几丁质酶活性抑制或诱导效应与时间有关，这可能是两者具有增效作用的重要机制。更多还原

【Abstract】 To elucidate the synergistic mechanism of Metarhizium anisopliae and insect immunosuppressive proteins, the toxicity of the immunosuppressive protein FKBP52 and M. anisopliae to western flower thrips Frankliniella occidentalis were evaluated. The activities of carboxylesterase(CarE),glutathione-S transferase(GST), phenoloxidase(PO), and chitinase in F. intonsa also were assessed using the impregnation method. The results revealed that the median lethal time(LT50) for the combination of M. anisopliae and FKBP52 protein against F. intonsa was 7.32 d, demonstrating enhanced effectiveness compared to M. anisopliae(10.87 d) or FKBP52 protein(14.15 d) alone. When combined for nine days, the mortality rate of F. intonsa reached 81.11%, significantly higher than the rates observed with M. anisopliae(45.56%) or FKBP52 protein(36.67%) alone. The synergistic index of this mixture was24.10, indicating a notable synergistic effect. Compared to the use of M. anisopliae alone, the activity levels of CarE and PO in F. intonsa initially decreased and then increased from day 1 to day 3 following the combined application of M. anisopliae and FKBP52 protein. The GST activity was significantly elevated only on day 2. Chitinase activity decreased on day 2 and then increased on day 3. These findings suggest that the time-dependent modulation of CarE, GST, PO, and chitinase activities in F. intonsa following the combined application of M. anisopliae and FKBP52 protein could be a crucial mechanism underpinning their synergistic effect.更多还原