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Original Research ARTICLE Provisionally accepted The full-text will be published soon. Notify me

Front. Genet. | doi: 10.3389/fgene.2019.01035

Population Genomics of the Neotropical brown stink bug, Euschistus heros: The most important emerging insect pest to soybean in Brazil

 Maria I. Zucchi1*,  Erick Coordeiro2*, Xing Wu3, Letícia Marise Lamana M. Lamana4,  Patrick J. Brown5, Shilpa Manjunatha5,  João P. Viana6,  Celso Omoto2, Jose B. Pinheiro2 and Steven J. Clough3
  • 1Sao Paulo Agency of Agribusiness and Technology (APTA), Brazil
  • 2Luiz de Queiroz College of Agriculture, University of São Paulo, Brazil
  • 3University of Illinois at Urbana-Champaign, United States
  • 4Universidade Estadual de Ponta Grossa, Brazil
  • 5University of California, Davis, United States
  • 6Campinas State University, Brazil

Recent changes in the soybean management like the adoption of transgenic crops and no-till farming, in addition to the expansion of cultivated areas into new virgin frontiers, are some of the hypotheses that can explain the rise of secondary pests, such as the Neotropical brown stink bug, Euschistus heros, in Brazil. To better access the risk of increased pests like E. heros, and to determine probabilities for insecticide resistance spreading or impact of a new plant variety, it is necessary first to access the local level of the genetic diversity of the pest, and to determine how the species diversity is distributed across different areas and how natural selection is acting upon the natural variation. Using the genotyping by sequencing (GBS) technique, we generated ~60,000 single-nucleotide polymorphisms (SNPs) distributed across the E. heros genome. The SNP data can be used to investigate issues related to this emerging pest. We found that E. heros populations presented high levels of genetic diversity with slightly higher values at the central locations in Brazil. Our results also showed strong genetic structure separating northern and southern parts of the range (FST=0.22 p-value=0.000) with a very distinct hybrid zone at the central region. The analyses also suggest the possibility that transcription factors, metabolic enzymes, and GABA channels might play a role in selection. We discuss the implication of this finding to the pest management of emerging pest in agriculture, particular in the context of large areas of monoculture such as soybean and cotton.

Keywords: Population Genomics, GBS, soybean pest, Single-nucleotide polymorphism marker, Euschistus heros, neotropical brown stink bug

Received: 27 Aug 2018; Accepted: 27 Sep 2019.

Copyright: © 2019 Zucchi, Coordeiro, Wu, Lamana, Brown, Manjunatha, Viana, Omoto, Pinheiro and Clough. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence:
Prof. Maria I. Zucchi, Sao Paulo Agency of Agribusiness and Technology (APTA), São Paulo, Brazil, mizucchi@gmail.com
Dr. Erick Coordeiro, Luiz de Queiroz College of Agriculture, University of São Paulo, Piracicaba, Sao Paulo, Brazil, cordeiro.emg@gmail.com