期刊
ANNALS OF THE ENTOMOLOGICAL SOCIETY OF AMERICA
卷 102, 期 3, 页码 413-418出版社
OXFORD UNIV PRESS INC
DOI: 10.1603/008.102.0309
关键词
secondary symbionts; fitness; longevity; fecundity; survival
类别
资金
- United States-Israel Binational Science Foundation (BSF), Jerusalem, Israel [2004416]
- National Research Initiative of the USDA Cooperative State Research, Education and Extension Service [2006-35302-17165]
- United-States-Israel Binational Agricultural Research and Development fund (BARD) [GS-1-2007]
- Agricultural Research Organization, Bet Dagan, Israel [503/08]
The sweet potato whitefly, Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae), harbors several bacterial symbionts, including the obligate primary symbiont Portiera aleyrodidarum, and the facultative secondary symbionts Arsenophonus, Cardinium, Fritschea, Hamiltonella, Rickettsia, and Wolbachia. The roles of these symbionts are yet unknown. In this study, we tested for possible effects of one symbiont, Rickettsia, on some fitness parameters of B. tabaci (biotype B) by comparing whiteflies that carry this symbiont to whiteflies that do not. Preadult development of Rickettsia-carrying whiteflies was faster, but all the other parameters that were measured: longevity, total number of progeny, sex ratio, and nymphal survivorship did not differ significantly. Estimates of the intrinsic growth rate (r) were almost identical for the two groups. Cross-mating between Rickettsia-carrying and Rickettsia-free whiteflies provided no evidence for cytoplasmic incompatibility. Vertical transmission of Rickettsia was found to be nearly complete. Our results do not clearly identify a selective advantage that would explain the high prevalence of Rickettsia in B. tabaci populations, thus, other fitness parameters and horizontal transmission routes are suggested and discussed.
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