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Your Position :Home->Past Journals Catalog->2019年56 No.6

Effects of the Rickettsia endosymbiont on the host preferences and parasitism rate of Encarsia formosa, a parasitoid of the whitefly Bemisia tabaci
Author of the article:LIU Yuan;LI Ying;PENG Jing;CHEN Xin-Yi;FAN Ze-Yun;QIU Bao-Li1,
Author's Workplace: Key Laboratory of Bio-Pesticide Creation and Application, Guangzhou 510640, China; Engineering Research Center of Biological Control, Ministry of Education, Guangzhou 510640, China; Department of Entomology, South China Agricultural University, Guangzhou 510640, China
Key Words:Rickettsia; Bemisia tabaci; Encarsia formosa; host preference; parasitism rate
Abstract:[Objectives]  To investigate the impact of Rickettsia infection on the resistance of the whitefly Bemisia tabaci to the parasitoid wasp Encarsia formosa, and provide new strategies for whitefly management. [Methods]  The parasitism rate, developmental period, eclosion rate, body size (body length, body width, head length and head width) and the host preferences of E. formosa for different B. tabaci hosts, were investigated in both Rickettsia positive and negative populations of B. tabaci (B-biotype) and its parasitoid E. formosa. [Results]   Rickettsia infection had a significant effect on the parasitism rate and developmental period of E. formosa, but no significant effects on the eclosion rate and body size of F1 generation adults. The average parasitism rates of E. formosa on Rickettsia positive and negative B. tabaci nymphs was 32.52% and 41.50%, respectively, and the developmental periods of these two populations were 14.5 d and 15.0 d, respectively. The eclosion rates of F1 generation E. formosa adults raised on either Rickettsia positive or Rickettsia negative B. tabaci nymphs, were 79.02% and 83.71%, respectively; the body length, body width, head length, and head width of F1 generation E. formosa adults raised on Rickettsia positive hosts were slightly larger than those of wasps raised on Rickettsia negative hosts. In laboratory choice experiments, the average parasitism rates of E. formosa on Rickettsia positive vs Rickettsia negative B. tabaci hosts were 35.26% and 50.22%, respectively. Under semi-field conditions, the average parasitism rates of E. formosa on Rickettsia positive populations was 35.03% in choice experiments; significantly lower than that on Rickettsianegative populations (57.79%). [Conclusion]  Rickettsia infection reduces the susceptibility of B. tabaci to parasitism by E. formosa because E. formosa females prefer to parasitize Rickettsia negative B. tabaci, a preference that potentially increases the survival of their offspring.
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