Correlation Between Ectoenzyme Activity and Virulence against Planococcus citri of Metarhizium anisopliae F061
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摘要: 室内测定台湾黑僵菌F061菌株的孢外酶活性及其对柑橘粉蚧的毒力,并通过线性回归分析探讨两者的相关性。结果表明:供试菌株的2种胞外酶活性均在1.00×108和1.00×107孢子·mL-12个处理时较高,其中蛋白酶活性达7.63 U·mL-1和7.61 U·mL-1,几丁质酶活性达5.45 U·mL-1和5.67 U·mL-1;供试菌株对柑橘粉蚧的LT50也在1.00×108和1.00×107孢子·mL-12个处理时较短,分别为4.98 d和5.39 d;线性回归分析表明,供试菌株对柑橘粉蚧的LT50与菌株蛋白酶活性呈显著负相关,与菌株几丁质酶活性呈中度负相关。可见,台湾黑僵菌F061菌株蛋白酶活性比几丁质酶活性强,在侵染柑橘粉蚧过程中起更直接的作用。Abstract: The ectoenzyme activity and the virulence against Planococcus citri of Metarhizium anisopliae F061 were determined in the laboratory. Their correlation was established using a linear regression analysis. The activities of two ectoenzymes from the bacteria were high.At concentrations of 1.00×108 and 1.00×107 conidia·mL-1, the protease activities of the spores were 7.63 U·mL-1 and 7.61 U·mL-1, respectively; while the chitinase activities, 5.45 U·mL-1 and 5.67 U·mL-1, respectively; and, the LT50 of the strain against P.citri, 4.98 d and 5.39 d, respectively. The LT50 inversely correlated significantly with the protease activity, but moderately with the chitinase activity. It appeared that the protease were stronger than the chitinase in M.anisopliae F061, and thus, played a more critical role in infecting P. citri.
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Key words:
- Metarhizium anisopliae /
- ectoenzyme /
- Planococcus citri /
- virulence /
- correlation
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表 1 台湾黑僵菌F061菌株对柑橘粉蚧成虫的LT50
Table 1. LT50 of M. anisopliae F061 against P. citri
孢子浓度/
(孢子·mL-1)毒力回归方程 相关系数 LT50
/d95%置信区间
/d1.00×104 y=0.6256+4.4463x 0.9577 9.63 (7.31~12.70) a 1.00×105 y=0.5833+4.9733x 0.9710 7.73 (6.38~9.36) b 1.00×106 y=0.4428+5.4980x 0.9846 6.74 (5.95~7.64) b 1.00×107 y=0.5276+6.1150x 0.9826 5.39 (4.81~6.04) c 1.00×108 y=0.4795+6.4818x 0.9866 4.98 (4.53~5.48) c 注:表中同列不同字母表示差异显著 (P<0.05)。 -
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