Endosymbiont metacommunities, mtDNA diversity and the evolution of the Bemisia tabaci (Hemiptera: Aleyrodidae) species complex.
Bemisia tabaci, an invasive pest that causes crop damage worldwide, is a highly differentiated species complex, divided into biotypes that have mainly been defined based on mitochondrial DNA sequences. Although endosymbionts can potentially induce population differentiation, specialization and indirect selection on mtDNA, studies have largely ignored these influential passengers in B. tabaci, despite as many as seven bacterial endosymbionts have been identified. Here, we investigate the composition of the whole bacterial community in worldwide populations of B. tabaci, together with host genetic differentiation, focusing on the invasive B and Q biotypes. Among 653 individuals studied, more than 95% of them harbour at least one secondary endosymbiont, and multiple infections are very common. In addition, sequence analyses reveal a very high diversity of facultative endosymbionts in B. tabaci, with some bacterial genus being represented by more than one strain. In the B and Q biotypes, nine different strains of bacteria have been identified. The mtDNA-based phylogeny of B. tabaci also reveals a very high nucleotide diversity that partitions the two ITS clades (B and Q) into six CO1 genetic groups. Each genetic group is in linkage disequilibrium with a specific combination of endosymbionts. All together, our results demonstrate the rapid dynamics of the bacterial endosymbiont-host associations at a small evolutionary scale, questioning the role of endosymbiotic communities in the evolution of the Bemisia tabaci species complex and strengthening the need to develop a metacommunity theory of inherited endosymbionts.
Gueguen
Gwénaelle
G
Université de Lyon; Université Lyon 1; CNRS; UMR 5558, Laboratoire de Biométrie et Biologie Evolutive, 43 Boulevard du 11 Novembre 1918, Villeurbanne F-69622, FranceLaboratoire d'Entomologie Fondamentale et Appliquée, Département de Biologie et Physiologie Animales, Université de Ouagadougou, 03 BP 7021 Ouagadougou 03CIRAD, UMR BGPI, TA A54/K, Campus International de Baillarguet, Montpellier Cedex, FranceThe Agricultural Research Organization (ARO), Department of Entomology, Newe Ya'ar Research Center, PO Box 1021, Ramat Yishay 30095, IsraelDepartment of Evolutionary and Environmental Biology, University of Haifa, Haifa, IsraelThe Agricultural Research Organization (ARO), Department of Entomology, Volcani Center, PO Box 6, Bet-Dagan 50250, Israel.
Vavre
Fabrice
F
Gnankine
Olivier
O
Peterschmitt
Michel
M
Charif
Delphine
D
Chiel
Elad
E
Gottlieb
Yuval
Y
Ghanim
Murad
M
Zchori-Fein
Einat
E
Fleury
Frédéric
F
D000818:Animals; D001419:Bacteria / Q000145:classification* / Q000235:genetics; D005075:Biological Evolution; D004272:DNA, Mitochondrial / Q000235:genetics; D021903:DNA, Ribosomal Spacer / Q000235:genetics; D006430:Hemiptera / Q000235:genetics* / Q000382:microbiology*; D015810:Linkage Disequilibrium; D008969:Molecular Sequence Data; D010802:Phylogeny; D013559:Symbiosis
D004272:DNA, Mitochondrial; D021903:DNA, Ribosomal Spacer