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Infection prevalence of Sodalis symbionts among stinkbugs

Zoological Letters volume 1, Article number: 5 (2015) Cite this article

Abstract

Introduction

Diverse insects and other organisms are associated with microbial symbionts, which often significantly contribute to growth and survival of their hosts and/or drastically affect phenotypes of their hosts in a variety of ways. Sodalis glossinidius was first identified as a facultative bacterial symbiont of tsetse flies, and recent studies revealed that Sodalis-allied bacteria encompass diverse ecological niches ranging from free-living bacteria through facultative symbionts to obligate symbionts associated with a diverse array of insects. Despite potential ecological and evolutionary relevance of the Sodalis symbionts, their infection prevalence in natural insect populations has been poorly investigated.

Results

Here we surveyed diverse stinkbugs and allied terrestrial heteropteran bugs, which represented 17 families, 77 genera, 108 species, 310 populations and 960 individuals, for infection with the Sodalis symbionts. Diagnostic PCR detected relatively low infection frequencies of the Sodalis symbionts: 13.6% (14/103) of the species, 7.5% (22/295) of the populations, and 4.3% (35/822) of the individuals of the stinkbugs except for those belonging to the family Urostylididae. Among the urostylidid stinkbugs, strikingly, the Sodalis symbionts exhibited very high infection frequencies: 100% (5/5) of the species, 100% (15/15) of the populations, and 94.2% (130/138) of the individuals we examined. Molecular phylogenetic analysis based on bacterial 16S rRNA gene sequences revealed that all the symbionts were placed in the clade of Sodalis-allied bacteria while the symbiont phylogeny did not reflect the systematics of their stinkbug hosts. Notably, the Sodalis symbionts of the urostylidid stinkbugs were not clustered with the Sodalis symbionts of the other stinkbug groups on the phylogeny, suggesting their distinct evolutionary trajectories.

Conclusions

The relatively low infection frequency and the overall host-symbiont phylogenetic incongruence suggest that the Sodalis symbionts are, in general, facultative symbiotic associates in the majority of the stinkbug groups. On the other hand, it is conceivable, although speculative, that the Sodalis symbionts may play some substantial biological roles for their host stinkbugs of the Urostylididae.

Introduction

Diverse insects are associated with symbiotic microorganisms [1]. Some symbionts are obligate companions essential for their hosts via, for example, provisioning of essential nutrients deficient in their host’s diets, and often referred to as the primary symbionts [2,3]. Other symbionts are facultative associates not essential for their hosts, and often designated as the secondary symbionts [4,5]. Although not needed for their host’s survival, many of the facultative symbionts drastically affect various adaptive phenotypes of their hosts, which include manipulating host’s reproductive phenotypes in selfish ways [6,7], conferring host’s resistance to parasites and pathogens [8-10], enhancing host’s tolerance to heat stress [11,12], broadening host’s food plant range [13,14], modifying host’s body color [15,16] and others.

Grasping infection prevalence of these symbionts is important for gaining insights into biological interactions with their hosts. The primary symbionts of obligate nature generally exhibit 100% infection frequencies in their host populations due to their indispensable roles. By contrast, the secondary symbionts of facultative nature exhibit variable infection frequencies ranging from near 0% to almost 100% depending on the symbiont species, the host species and populations, the environmental conditions, etc. For example, some Wolbachia strains attain 100% infection frequencies in their host populations by their selfish driving mechanisms such as cytoplasmic incompatibility and parthenogenesis induction [6,7]. The facultative symbionts Serratia, Regiella and Hamiltonella in natural aphid populations exhibit intermediate values between 0% to 100% [17-20], which probably reflect their context-dependent fitness consequences [8,9,11,13].

Sodalis glossinidius was first identified and described as a gammaproteobacterial secondary symbiont of tsetse flies (Diptera: Glossinidae) [21-23]. Subsequently, primary symbionts associated with bacteriocytes of Sitophilus grain weevils (Coleoptera: Curculionidae) turned out to be closely related to Sodalis [24,25] and designated as ‘Candidatus Sodalis pierantonius’ [26]. Recently, a number of studies have reported occurrences of Sodalis-allied bacteria in a diverse array of insects: as bacteriocyte-associated presumable primary symbionts in bird lice (Phthiraptera: Philopteridae) [27,28], louse flies (Diptera: Hippoboscidae) [29,30], spittle bugs (Hemiptera: Cercopoidea) [31,32] and pseudococcids (Hemiptera: Pseudococcidae) [33]; and as presumable secondary symbionts in acorn weevils (Coleoptera: Curculionidae) [34-36], longicorn beetles (Coleoptera: Cerambycidae) [37], stinkbugs (Hemiptera: Scutelleridae and Pentatomidae) [38-41], psyllids (Hemiptera: Triozidae) [42] and archaeococcoid scale insects (Hemiptera: Coelostomidiidae) [43]. Furthermore, a Sodalis-allied bacterial strain was isolated from a human wound infection [44], and a biofilm-forming bacterium isolated from a tufa deposit, Biostraticola tofi, turned out to be a close relative of Sodalis [45], uncovering diverse ecological niches and symbiotic statuses of the Sodalis-allied bacteria. While infection frequencies in natural insect populations have been extensively surveyed for Wolbachia [46-48], Rickettsia [49,50], Cardinium [51-53], Spiroplasma [52,54], Arsenophonus [52,55] and other facultative symbionts, no systematic and comprehensive survey of Sodalis symbionts in natural host populations has been reported.

In this study, we surveyed diverse stinkbugs and allied terrestrial heteropteran bugs (order Hemiptera: suborder Heteroptera: infraorder Pentatomomorpha), which represent 17 families, 77 genera, 108 species, 310 populations and 960 individuals, for infection with Sodalis symbionts by diagnostic PCR and molecular phylogenetic approaches.

Materials and methods

Insect samples

Additional file 1 lists the insect samples examined in this study. These insects were preserved in either acetone or ethanol [56], or freshly brought to the laboratory. For large specimens, dissected gonad was subjected to DNA extraction. For small specimens, dissected abdomen was subjected to DNA extraction. DNA extraction was performed using QIAamp DNA Mini kit (Qiagen).

PCR, cloning and sequencing

A 1.5 kb region of the bacterial 16S rRNA gene was amplified by PCR with primers 16SA1 (5’-AGA GTT TGA TCM TGG CTC AG-3’) and 16SB1 (5’-TAC GGY TAC CTT GTT ACG ACT T-3’), and cloned and sequenced as described previously [57]. Diagnostic PCR was performed with primers sodalis370F (5’-CGR TRG CGT TAA YAG CGC-3’) [38] and 16SB1 under the temperature profile of 95°C for 10 min followed by 35 cycles of 94°C for 30 sec, 55°C for 1 min and 72°C for 1.5 min. For quality control of the DNA samples, a 1.5 kb region of mitochondrial 16S rRNA gene was amplified by PCR with primers MtrA1 (5’-AAW AAA CTA GGA TTA GAT ACC CTA-3’) and MtrB1 (5’-TCT TAA TYC AAC ATC GAG GTC GCA A-3') [58].

Molecular phylogenetic analysis

A multiple alignment of the nucleotide sequences was generated by the program MAFFT version 7.127b [59]. The nucleotide substitution model, GTR + I + G, was selected using the program jModelTest 2 [60,61]. The phylogenetic analyses were conducted by Bayesian (BA) and maximum-likelihood (ML) methods with the programs MrBayes v3.2.2 [62] and RAxML version 7.2.6 [63], respectively. In the BA analysis, in total 37,500 trees were obtained for each analysis (ngen = 50,000,000, samplefreq = 1,000, burn in = 12,501, temp = 0.2) and multiple independent runs were conducted to ensure the stable results. Posterior probabilities were calculated for each node by statistical evaluation in BA, whereas bootstrap values were obtained with 1000 replications in ML.

Results and discussion

Our diagnostic PCR survey of diverse stinkbugs and allied terrestrial heteropteran bugs, which represent 17 families, 77 genera, 108 species, 310 populations and 960 individuals, detected Sodalis symbionts from 17.6% (19/108) of the species, 11.0% (34/310) of the populations, and 17.2% (165/960) of the individuals (Table 1; Additional file 1). The infection frequencies were generally low and considerably variable among the different heteropteran groups: at the individual level, for example, 15.4% (4/26) in the Acanthosomatidae; 0.0% (0/33) in the Cydnidae; 5.6% (18/323) in the Pentatomidae; 0.0% (0/40) in the Plataspidae; 4.5% (11/247) in the Scutelleridae; 0.0% (0/30) in the Alydidae; 0.0% (0/45) in the Coreidae; and 0.0% (0/43) in the Blissidae (Table 1; Additional file 1). In the Urostylididae, by contrast, infection frequencies with the Sodalis symbionts were exceptionally high: 100% (5/5) of the species, 100% (15/15) of the populations and 94.2% (130/138) of the individuals (Table 1; Additional file 1) [40].

Table 1 Detection of Sodalis symbionts from stinkbugs representing 17 families, 77 genera, 108 species, 310 populations and 960 individuals collected in Japan
Full size table

In previous studies, 16S rRNA gene sequences of the Sodalis symbionts were determined for two scutellerid species Cantao ocellatus and Eucoryses grandis [38,39] and four urostylidid species Urostylis annulicornis, Urostylis striicornis, Urostylis westwoodii and Urochela quadrinotata [40]. In this study, we newly cloned and sequenced 16S rRNA gene of the Sodalis symbionts from the following heteropteran species: an acanthosomatid Elasmucha putoni; pentatomids Aelia fieberi (from two populations), Dolycoris baccarum, Glaucias subpunctatus, Lelia decempunctata, Nezara antennata (from three populations), Palomena angulosa, Picromerus lewisi and Piezodorus hybneri; a scutellerid Poecilocoris lewisi; and a rhopalid Rhopalus sapporensis (Figure 1). Molecular phylogenetic relationship of the Sodalis symbionts associated with the heteropteran bugs and other insects was inferred from the 16S rRNA gene sequences (Figure 2). The phylogenetic pattern indicated that (i) all the symbiont sequences were placed in the clade of Sodalis-allied bacteria with high statistical supports, (ii) the symbiont sequences within the same host species tended to be closely related to each other, (iii) nonetheless, the overall phylogenetic relationship of the symbiont sequences did not reflect the systematics of the host stinkbugs, and (iv) notably, the Sodalis symbionts of the urostylidid stinkbugs were not clustered with the Sodalis symbionts of the other stinkbug groups on the phylogeny.

Figure 1
figure 1

Stinkbugs associated with the Sodalis symbionts. (A) Elasmucha putoni. (B) Aelia fieberi. (C) Dolycoris baccarum. (D) Glaucias subpunctatus. (E) Lelia decempunctata. (F) Nezara antennata. (G) Palomena angulosa. (H) Picromerus lewisi. (I) Piezodorus hybneri. (J) Cantao ocellatus. (K) Eucorysses grandis. (L) Poecilocoris lewisi. (M) Urochela luteovaria. (N) Urochela quadrinotata. (O) Urostylis annulicornis. (P) Urostylis striicornis. (Q) Urostylis westwoodii. (R) Rhopalus sapporensis. Photos by Toru Kawabe (A-D, G, I, L, M and R), Takahiro Hosokawa (E, F, J, K and Q), Joji Yokozeki (H), Gaku Miyake (N), Nahomi Kaiwa (O) and Yoshishige Shinogi (P).

Full size image
Figure 2
figure 2

Phylogenetic relationship between Sodalis symbionts of heteropteran bugs and other insects inferred from 16S rRNA gene sequences (1204 aligned nucleotide sites). A Bayesian phylogeny is shown with statistical support values (50% or higher) at the nodes: posterior probabilities of Bayesian analysis/bootstrap probabilities of maximum likelihood analysis. Asterisks indicate support values lower than 50%. Sequences obtained from stinkbugs are highlighted by boldface, wherein collection localities are indicated in parentheses and accession numbers in brackets.

Full size image

The relatively low infection frequencies and the overall host-symbiont phylogenetic incongruence favor the hypothesis that the Sodalis symbionts are, in general, facultative associates for the heteropteran bugs, as Wolbachia, Rickettsia, Spiroplasma, Lariskella, etc. [41,64-66]. The majority of the plant-sucking heteropteran bugs harbor specific gut bacteria as the primary symbionts within the crypt cavities present in a posterior midgut region [1,67,68], which are important for normal growth, survival and reproduction of the host insects [69-80]. Probably, the majority of the Sodalis symbionts are, unlike the primary gut symbionts, not essential for their heteropteran hosts. On the other hand, it is conceivable, although speculative, that the Sodalis symbionts may play some substantial biological roles for their host stinkbugs in the Urostylididae. It deserves future studies what biological roles, which are likely condition-dependent ones, the Sodalis symbionts play for their urostylidid hosts.

Conclusions

In conclusion, our results highlight that the Sodalis symbionts are facultative symbiotic bacteria commonly associated with diverse insects, as are Wolbachia, Rickettsia, Spiroplasma, Cardinium, Arsenophonus and other widespread facultative symbionts. In this study, we exhaustively surveyed diverse stinkbugs in Japan, but, considering the recent report on the infection prevalence of the Sodalis symbiont in African populations of the coffee bug Antestiopsis thunbergii (Pentatomidae) [41], the occurrence of the Sodalis symbionts seems widespread among world’s stinkbugs and other insects. Future studies should focus on comprehensive survey of insect groups other than the heteropteran bugs, and also on effects and consequences of their infection to the host insects. Comparative studies on Sodalis-infected and uninfected host insects under the same genetic background combined with genomic and molecular biological analyses of the Sodalis symbionts will provide insights into ecological and evolutionary aspects of animal-microbe symbioses wherein the associations may range from free-living through facultative to obligate.

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Acknowledgments

We thank Atsushi Kikuchi, Atsushi Nagayama, Akio Tanigawa, Chihiro Himuro, Eiichi Hara, Fumitaka Kuchiki, Hiroyuki Hirayama, Hirosato Kodama, Hiromi Mukai, Hirokazu Toju, Junko Makino, Katsura Ito, Koichi Inadomi, Kiyomitsu Ito, Katsuyuki Kohno, Kyosuke Okuda, Keiko Ohno-Shiromoto, Kohjiro Tanaka, Mitsuo Baba, Masaaki Kimura, Mitsutaka Sakakibara, Mikio Takai, Narumi Baba, Nobuo Tsurusaki, Nakatada Wachi, Rie Ukuda, Shuhei Kada, Shin-ich Kudo, Satoshi Maehara, Takayuki Kashima, Taku Tsukada, Yoshiko Ayabe, Yu Gyotoku and Yuki G. Baba for providing insect samples, and Toru Kawabe, Gaku Miyake, Joji Yokozeki and Yoshishige Shinogi for insect photos. This study was supported by Grants-in-Aid for Scientific Research (S) (25221107) from Japan Society of the Promotion of Science.

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Authors and Affiliations

  1. Bioproduction Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, 305-8566, Japan

    Takahiro Hosokawa, Nahomi Kaiwa, Yu Matsuura & Takema Fukatsu

  2. Tropical Biosphere Research Center, University of the Ryukyus, Okinawa, 903-0213, Japan

    Takahiro Hosokawa

  3. Department of General Systems Studies, Graduate School of Arts and Science, University of Tokyo, Tokyo, 153-8902, Japan

    Nahomi Kaiwa

  4. Graduate School of Environmental Science, Hokkaido University, Sapporo, 060-0810, Japan

    Yu Matsuura

  5. Bioproduction Research Institute, Hokkaido Center, National Institute of Advanced Industrial Science and Technology (AIST), Sapporo, 062-8517, Japan

    Yoshitomo Kikuchi

  6. Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, 305-8572, Japan

    Takema Fukatsu

  7. Department of Biological Sciences, University of Tokyo, Tokyo, 113-0033, Japan

    Takema Fukatsu

Authors
  1. Takahiro Hosokawa
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  2. Nahomi Kaiwa
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  3. Yu Matsuura
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  4. Yoshitomo Kikuchi
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  5. Takema Fukatsu
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Corresponding author

Correspondence to Takema Fukatsu.

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Competing interests

The authors declare that they have no competing interests.

Authors’ contributions

TH, NK and YK collected the insects and prepared the DNA samples. TH and NK performed PCR, cloning and sequencing of 16S rRNA gene of the Sodalis symbionts. TH and YM conducted molecular phylogenetic analysis. TF wrote the manuscript. All authors read and approved the final manuscript.

Additional file

Additional file 1:

Stinkbug samples examined in this study and detection of Sodalis symbionts from the samples.

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Hosokawa, T., Kaiwa, N., Matsuura, Y. et al. Infection prevalence of Sodalis symbionts among stinkbugs. Zoological Lett 1, 5 (2015). https://doi.org/10.1186/s40851-014-0009-5

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Keywords

Zoological Letters

ISSN: 2056-306X

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