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Development of molecular markers for early detection of insecticide resistance in Spodoptera frugiperda and Euschistus heros using transcriptome and whole genome sequencing analyses

Grant number: 18/20668-0
Support Opportunities:Scholarships abroad - Research Internship - Post-doctor
Effective date (Start): December 01, 2018
Effective date (End): November 30, 2019
Field of knowledge:Agronomical Sciences - Agronomy - Plant Health
Principal Investigator:Celso Omoto
Grantee:Erick Mauricio Goes Cordeiro
Supervisor: Christopher Bass
Host Institution: Escola Superior de Agricultura Luiz de Queiroz (ESALQ). Universidade de São Paulo (USP). Piracicaba , SP, Brazil
Research place: University of Exeter, Exeter, England  
Associated to the scholarship:17/02393-0 - Resistance to insecticide in Euchistus heros (Hemiptera: Pentatomidae): genetic diversity and association mapping of resistance genes, BP.PD


The continued exposure to insecticides imposes a strong selective pressure upon target site mutations and almost invariably leads to resistance evolution. The development of means to reliably monitor resistance can be of great advantage to pest and resistance management helping the decision-makers to implement better and more sustainable strategies to delay chemical control failure in the field. Yet, the challenge resides on the fact that resistance to insecticide can be the product of multiple mechanisms and interconnected physiological pathways that make the recognition of its factors rather challenging. Unfortunately, the currently used methodologies such as the phenotypic and the genotypic methods still suffers from major hurdles involving cost and the laboriousness of laboratory colony maintenance and large-scale cross assays to detect rare alleles. The development of high-throughput DNA and RNA sequencing technologies are now powerful tools that can be used to detect mutations associated with the resistance phenotype allowing the development of reliable markers and the elucidation of complex physiological mechanisms involving gene expression and gene regulation. Our main goal with this project is to develop molecular tools for the detection and genotyping of resistant variant alleles present in field populations. Such tools can be used in the insect resistance monitoring effort of Spodoptera frugiperda and Euschistus heros also offering prospects for mechanism elucidation and new forms of control. In the case of S. frugiperda we propose to use the reference genome to map RNA- (i.e. transcriptome) and DNA-based (GBS) markers and to use GWAS and TWAS approaches to detect putative markers associated with resistance to the insecticide spinosad. For E. heros, we propose the whole sequence of the genome (WGS) to be later use in mapping or the association studies of resistance genes in populations this emerging species.

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
SINGH, KUMAR SAURABH; CORDEIRO, ERICK M. G.; HUNT, BENJAMIN J.; PANDIT, ANIRUDDHA A.; SOARES, PATRICIA L.; CORREA, ALBERTO S.; ZIMMER, CHRISTOPH T.; ZUCCHI, MARIA, I; BATISTA, CARLOS; DOW, JULIAN A. T.; et al. The genome sequence of the Neotropical brown stink bug, Euschistus heros provides insights into population structure, demographic history and signatures of adaptation. Insect Biochemistry and Molecular Biology, v. 152, p. 10-pg., . (18/21155-6, 17/50455-5, 18/20668-0)

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