New Mitochondrial Gene Rearrangement in Psyttalia concolor, P. humilis and P. lounsburyi (Hymenoptera: Braconidae), Three Parasitoid Species of Economic Interest
1
Department of Genetics, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa
2
Department of Agricultural, Food and Forest Sciences, Università degli Studi di Palermo, Viale delle Scienze, Edificio 5, 90128 Palermo, Italy
3
Unit for Cardiac and Cardiovascular Genetics, Department of Medical Genetics, Oslo University Hospital, Postboks 4956 Nydalen, 0424 Oslo, Norway
4
Norsk Entomologisk Forening, Naturhistorisk Museum, Universitetet i Oslo, Postboks 1172 Blindern, 0318 Oslo, Norway
*
Authors to whom correspondence should be addressed.
†
Authors contributed equally to this work.
Insects 2020, 11(12), 854; https://doi.org/10.3390/insects11120854
Received: 14 November 2020 / Revised: 23 November 2020 / Accepted: 25 November 2020 / Published: 2 December 2020
(This article belongs to the Section Insect Molecular Biology and Genomics)
Simple Summary
Parasitoid wasps in the family Braconidae are generally highly specialized and can be used as agents for biological control of arthropod pests. Psyttalia concolor, Psyttalia humilis and Psyttalia lounsburyi parasitize the larvae of the olive fruit fly (Bactrocera oleae), the most damaging pest of cultivated olives in the world. Psyttalia concolor is native to the Mediterranean, and P. humilis and P. lounsburyi are native to sub-Saharan Africa. Despite their potential for agricultural pest control, these species have been poorly characterized at the genetic level. We sequenced the mitochondrial genome of the three species and compared its organization with other Braconidae. Psyttalia had a unique gene rearrangement involving the positions of transfer RNA genes. We also present a phylogenetic reconstruction of the Braconidae and confirm the phylogenetic placement of Psyttalia in the subfamily Opiinae.
The family Braconidae consists mostly of specialized parasitoids, some of which hold potential in biocontrol of agricultural pests. Psyttalia concolor, Psyttalia humilis and Psyttalia lounsburyi are parasitoids associated with Bactrocera oleae, a major pest of cultivated olives. The native range of Psyttalia concolor is the Mediterranean, and P. humilis and P. lounsburyi are native to sub-Saharan Africa. This study reports the mitochondrial genomes of the three species, thus laying the foundation for mitogenomic analyses in the genus Psyttalia. Comparative mitogenomics within Braconidae showed a novel gene arrangement in Psyttalia in involving translocation and inversion of transfer RNA genes. The placement of Psyttalia in the subfamily Opiinae was well-supported, and the divergence between Psyttalia and its closest relative (Diachasmimorpha longicaudata) was at ~55 MYA [95% highest posterior density (HPD): 34–83 MYA]. Psyttalia lounsburyi occupied the most basal position among the three Psyttalia, having diverged from the other two species ~11 MYA (95% HPD: 6–17 MYA). Psyttalia concolor and P. humilis were recovered as sister species diverged at ~2 MYA (95% HPD: 1.1–3.6 MYA). This phylogeny combining new sequences and a set of 31 other cyclostomes and non-cyclostomes highlights the importance of a comprehensive taxonomic coverage of Braconidae mitogenomes to overcome the lack of robustness in the placement of several subfamilies.
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Keywords:
braconidae; cyclostome wasps; mitogenomics; opiinae; olive; phylogeny; Psyttalia humilis; Psyttalia lounsburyi
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MDPI and ACS Style
Powell, C.; Caleca, V.; Rhode, C.; Teixeira da Costa, L.; van Asch, B. New Mitochondrial Gene Rearrangement in Psyttalia concolor, P. humilis and P. lounsburyi (Hymenoptera: Braconidae), Three Parasitoid Species of Economic Interest. Insects 2020, 11, 854. https://doi.org/10.3390/insects11120854
AMA Style
Powell C, Caleca V, Rhode C, Teixeira da Costa L, van Asch B. New Mitochondrial Gene Rearrangement in Psyttalia concolor, P. humilis and P. lounsburyi (Hymenoptera: Braconidae), Three Parasitoid Species of Economic Interest. Insects. 2020; 11(12):854. https://doi.org/10.3390/insects11120854
Chicago/Turabian StylePowell, Chanté; Caleca, Virgilio; Rhode, Clint; Teixeira da Costa, Luis; van Asch, Barbara. 2020. "New Mitochondrial Gene Rearrangement in Psyttalia concolor, P. humilis and P. lounsburyi (Hymenoptera: Braconidae), Three Parasitoid Species of Economic Interest" Insects 11, no. 12: 854. https://doi.org/10.3390/insects11120854
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