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Lygus pratensis is a phytophagous pest responsible for yield losses in Bt alfalfa and other economic crops in Northwestern China. To better characterize Miridae at the genomic level, the complete mitochondrial (mt) genome of L. pratensis was sequenced and analyzed in this study. The mt genome was amplified via the polymerase chain reaction to generate overlapping fragments. These fragments were then sequenced, spliced, and analyzed to include the examination of nucleotide composition, codon usage, compositional biases, protein-coding genes (PCGs), and RNA secondary structures. Phylogenetic relationships between L. pratensis and other species in different Heteroptera families were also examined. The mt genome was found to be a typical circular genome with a length of 16,591 bp and a total AT content of 75.1%, encoded for 13 PCGs, 22 transfer RNAs (tRNAs), 2 ribosomal RNAs (lrRNA and srRNA), and a noncoding control region. The nucleotide composition of the entire mt genome was heavily biased toward A and T. All of the tRNAs were predicted to have classic clover leaf structures, but three of the tRNAs (tRNAAsn, tRNAHis, tRNAHis) were missing the TΨC loop. The control region (2,017 bp), which was found to be located between 12S and tRNAIle, contained three tandem repeat elements. Phylogenetic analyses showed that L. pratensis is closely related to the other three examined Lygus bugs, and that it is a sister group to Apolygus and Adelphocoris. This study confirms the usability of the mt genome in phylogenesis studies pertaining to the Lygus genus, within Miridae.

The Complete Mitochondrial Genome of the Plant Bug Lygus pratensis Linnaeus (Hemiptera: Miridae)