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Fitness costs associated with infections of secondary endosymbionts in the cassava whitefly species Bemisia tabaci

Fitness costs associated with infections of secondary endosymbionts in the cassava whitefly species Bemisia tabaci

Ghosh, Saptarshi, Bouvaine, Sophie, Richardson, Simon C. W., Ghanim, Murad and Maruthi, M. N. (2017) Fitness costs associated with infections of secondary endosymbionts in the cassava whitefly species Bemisia tabaci. Journal of Pest Science, 91. pp. 17-28. ISSN 1612-4758 (Print), 1612-4766 (Online) (doi:10.1007/s10340-017-0910-8)

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Abstract

We investigated the dual effects of bacterial infections and diseased cassava plants on the fitness and biology of the Bemisia tabaci infesting cassava in Africa. Isofemale B. tabaci colonies of sub-Saharan Africa 1-subgroup 3 (SSA1-SG3), infected with two secondary endosymbiotic bacteria Arsenophonus and Rickettsia (AR+) and those free of AR infections (AR-) were compared for fitness parameters on healthy and East African cassava mosaic virus-Uganda variant (EACMV-UG) infected cassava plants. The whitefly fecundity and nymph development was not affected by bacterial infections, or the infection of cassava by the virus. However, emergence of adults from nymphs was 50% and 17% higher by AR- on healthy and virus-infected plants, respectively than AR+ flies. Development time of adults also was 10 days longer in AR+ than AR-. The whiteflies were further compared for acquisition and retention of East African cassava mosaic virus-Uganda (EACMV-UG). Higher proportion of AR- acquired (91.8%) and retained (87.6%) the virus than AR+ (71.8%, 61.2%, respectively). Similarly, the AR- flies retained higher quantities of virus (~9 folds more) than AR+. These results indicated that bacteria-free whiteflies were superior and better transmitters of EACMV-UG, as they had higher adult emergence, quicker life-cycle and better virus retention abilities than those infected with bacteria.

Item Type: Article
Additional Information: © The Author(s) 2017. Open Access. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Uncontrolled Keywords: Cassava, whitefly, Arsenophonus, Rickettsia, fitness costs, virus retention
Subjects: S Agriculture > S Agriculture (General)
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Department of Life & Sports Sciences
Faculty of Engineering & Science > Natural Resources Institute
Faculty of Engineering & Science > Natural Resources Institute > Agriculture, Health & Environment Department
Last Modified: 01 May 2018 10:57
URI: http://gala.gre.ac.uk/id/eprint/18497

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