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2 results for “Probergrothius”
Angiosperm to Gymnosperm host-plant switch entails shifts in microbiota of the Welwitschia bug, Probergrothius angolensis (Distant, 1902)
<p>Adaptation of herbivorous insects to new host plants is key to their evolutionary success in diverse environments. Many insects are associated with mutualistic gut bacteria that contribute to the host's nutrition and can thereby facilitate dietary switching in polyphagous insects. However, how gut microbial communities differ between populations of the same species that feed on different host plants remains poorly understood. Most species of Pyrrhocoridae (Hemiptera: Heteroptera) are specialist seed-feeders on plants in the family Malvaceae, however populations of one species, <i>Probergrothius angolensis</i>, has switched to the very distantly related <i>Welwitschia mirabilis </i>plant in the Namib Desert. We first compared development and survival of laboratory populations of <i>Pr. angolensis</i> with two other pyrrhocorids on seeds of <i>Welwitschia</i> and found only <i>Pr. angolensis</i> capable of successfully completing its development. We then collected <i>Pr. angolensis</i> in Namibia<i> </i>from Malvaceae and <i>Welwitschia</i> host plants, respectively, to assess their bacterial and fungal community profiles using high-throughput amplicon sequencing. Comparison with long-term lab reared insects indicated stable associations of <i>Pr. angolensis</i> with core bacteria (<i>Commensalibacter, Enterococcus, Bartonella, </i>and <i>Klebsiella</i>), but not fungi or yeasts. Phylogenetic analyses of core bacteria revealed relationships to other insect-associated bacteria, but also found new taxa indicating potential host-specialized nutritional roles. Importantly, the microbial community profiles of bugs feeding on <i>Welwitschia</i> vs. Malvaceae revealed stark and consistent differences in the relative abundance of core bacterial taxa that correlate with the host-plant switch; a result we were able to recreate through feeding experiments. Thus, a dynamic gut microbiota may provide a means for insect adaptation to new host plants in new environments when food plants are extremely divergent.</p>
Angiosperm to Gymnosperm host-plant switch entails shifts in microbiota of the Welwitschia bug, Probergrothius angolensis (Distant, 1902)
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