Pathogenecity and Infectation Differentiations of Beauveria bassiana against Bemisia tabaci and Plutella xylostella

doi:10.16409/j.cnki.2095-039x.2016.06.008

Abstract

Abstract: To study the pathogenecity and morphological differentiations of Beauveria bassiana on cuticles of different insects, and to investigate the virulence-related characteristics of morphological differentiation, nine B. bassiana strains isolated from various insects were selected. The Hemiptera whitefly (Bemisia tabaci Gennadius) and Lepidoptera diamond back moth (Plutella xylostella Linnaeus) were used as hosts, a detailed comparison of pathogenecity, spores attachment, spores germination and growth rate of germ tubes of B. bassiana strains were conducted. The results suggested that virulence of six B. bassiana strains differed significantly between the two host insects, and three strains showed no significant difference. The Bb271 strain showed significant difference in pathogenecity to B. tabaci and P. xylostella, however the number of spores attached on per unit area, the germination rate, and the growth rate of germ tubes showed no significant difference between the two insects. The Bb104 and Bb120 strains also showed significant difference in pathogenecity to B. tabaci and P. xylostella, but the number of spores attached on per unit area and the germination rate showed no significant difference between the two insects, while the growth rates of germ tubes were significantly different. Therefore, it can be concluded that the virulence differentiation of B. bassiana to B. tabaci and P. xylostella was not related to spores attachment and spores germination, but to the growth rate of germ tubes on insect cuticles. The growth rate of germ tubes on insect cuticles may serve as the typical morphological characteristics in identifying pathogenecity of B. bassiana strains to different insects.

Key words: Beauveria bassiana, pathogenecity, infectation, mechanism

CLC Number:

S476.12

ZHOU Zheyu, ZHANG Hanghang, WU Hao, ZHU Hong. Pathogenecity and Infectation Differentiations of Beauveria bassiana against Bemisia tabaci and Plutella xylostella[J]. journal1, 2016, 32(6): 728-734.

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