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Rickettsia influences thermotolerance in the whitefly Bemisia tabaci B biotype

Insect Science 2011年第1期18卷 57-66页

作者： Marina Brumin svetlana kontsedalov Murad Ghanim Department of Entomology Institute of Plant Protection the Volcani Center Bet Dagan Israel

The whitefly Bemisia tabaci harbors Portiera aleyrodidarum, an obligatory symbiotic bacterium, as well as several secondary symbionts, including Rickettsia, Hamiltonella, Wolbachia, Arsenophonus, Cardinium and Fritschea, the function of which is unknown. In Israel, Rickettsia is found in both the B and Q ofB. tabaci biotypes, and while all other secondary symbionts are located in the bacteriomes, Rickettsia can occupy most of the body cavity of the insect. We tested whether Rickettsia influences the biology of B. tabaci and found that exposing a Rickettsia-containing population to increasing temperatures significantly increases its tolerance to heat shock that reached 40~C, compared to a Rickettsia-free population. This increase in tolerance to heat shock was not associated with specific induction of heat-shock protein gene expression; however, it was associated with reduction in Rickettsia numbers as was assessed by quantitative real-time polymerase chain reaction and fluorescence in situ hybridization analyses. To assess the causes for thermotolerance when Rickettsia is reduced, we tested whether its presence is associated with the induction of genes required for thermotolerance. We found that under normal 25℃ rearing temperature, genes associated with response to stress such as cytoskeleton genes are induced in the Rickettsia-containing population. Thus, the presence of Rickettsia in B. tabaci under normal conditions induces the expression of genes required for thermotolerance that under high temperatures indirectly lead to this tolerance.

关键词： cytoskeleton gene expression heat shock symbiont

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Bemisia tabaci Biotype Dynamics and Resistance to Insecticides in Israel During the Years 2008-2010

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Journal of Integrative Agriculture 2012年第2期11卷 312-320页

作者： svetlana kontsedalov Fauzi Abu-Moch Galina Lebedev Henryk Czosnek A Rami Horowitz Murad Ghanim Department of Entomology Agricultural Research OrganizationVolcani CenterBet Dagan 50250Israel Institute of Plant Sciences Faculty of AgricultureRehovot 76100Israel Department of Entomology Agricultural Research OrganizationGilat Research CenterM.P.Negev 85280Israel

The sweetpotato whitefly Bemisia tabaci（Hemiptera：Aleyrodidae）is an extremely polyphagous insect pest that causes significant crop losses in Israel and *** is a species complex of which the B and Q biotypes are the most widespread and damaging *** change in biotype composition and resistance to insecticide in Israel was monitored during the years 2008-2010 to identify patterns in population dynamics that can be correlated with resistance *** results show that B biotype populations dominate crops grown in open fields,while Q biotype populations gradually dominate crops grown in protected conditions such as greenhouses and nethouses,where resistance outbreaks usually develop after several insecticide *** in previous years,Q biotype populations were widely detected in many regions in Israel,significant domination of the B biotype across populations collected was observed during the year 2010,indicating the instability of the *** population from one year to *** for the changing dynamics and the shift in the relative abundance of *** biotype,and their resistance status,are discussed.

关键词： Bemisia tabaci biotype insecticide monitoring resistance

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