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Diversity of diazotrophic gut inhabitants of pikas (Ochotonidae) revealed by PCR-DGGE analysis

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Abstract

Diazotrophic gut symbionts are considered to act as nitrogen providers for their hosts, as was shown for various termite species. Although the diet of lagomorphs, like pikas or rabbits, is very poor in nitrogen and energy, their fecal matter contains 30–40% of protein. Since our hypothesis was that pikas maintained a diazotrophic consortium in their gastrointestinal tract, we conducted the first investigation of microbial diversity in pika guts. We obtained gut samples from animals of several Ochotona species, O. hyperborea (Northern pika), O. mantchurica (Manchurian pika), and O. dauurica (Daurian pika), in order to retrieve and compare the nitrogen-fixing communities of different pika species. The age and gender of the animals were taken into consideration. We amplified 320-bp long fragments of the nifH gene using the DNA extracted directly from the colon and cecum samples of pika’s gut, resolved them by DGGE, and performed phylogenetic reconstruction of 51 sequences obtained from excised bands. No significant difference was detected between the nitrogen-fixing gut inhabitants of different pika species. NifH sequences fell into two clusters. The first cluster contained the sequences affiliated with NifH Cluster I (Zehr et al., 2003) with similarity to Sphingomonas sp., Bradyrhizobium sp., and various uncultured bacteria from soil and rhizosphere. Sequences from the second group were related to Treponema sp., Fibrobacter succinogenes, and uncultured clones from the guts of various termites and belonged to NifH Cluster III. We suggest that diazotrophic organisms from the second cluster are genuine endosymbionts of pikas and provide nitrogen for further synthesis processes thus allowing these animals not to be short of protein.

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  1. Winogradsky Institute of Microbiology, Russian Academy of Sciences, Moscow, Russia

    A. K. Kizilova & I. K. Kravchenko

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  1. A. K. Kizilova
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Kizilova, A.K., Kravchenko, I.K. Diversity of diazotrophic gut inhabitants of pikas (Ochotonidae) revealed by PCR-DGGE analysis. Microbiology 83, 288–295 (2014). https://doi.org/10.1134/S0026261714010068

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