Evolutionary Biology

Transcriptional differences between the two host strains of Spodoptera frugiperda (Lepidoptera: Noctuidae)

10.24072/pcjournal.77 - Peer Community Journal, Volume 2 (2022), article no. e1.

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Spodoptera frugiperda, the fall armyworm (FAW), is an important agricultural pest in the Americas and an emerging pest in sub-Saharan Africa, India, East-Asia and Australia, causing damage to major crops such as corn, sorghum and soybean. While FAW larvae are considered polyphagous, differences in diet preference have been described between two genetic variants: the corn strain (sf-C) and the rice strain (sf-R). These two strains are sometimes considered as distinct species, raising the hypothesis that host plant specialization might have driven their divergence. To test this hypothesis, we first performed controlled reciprocal transplant (RT) experiments to address the impact of plant diet on several traits linked to the fitness of the sf-C and sf-R strains. The phenotypical data suggest that sf-C is specialized to corn. We then used RNA-Se to identify constitutive transcriptional differences between strains, regardless of diet, in laboratory as well as in natural populations. We found that variations in mitochondrial transcription levels are among the most substantial and consistent differences between the two strains. Since mitochondrial genotypes also vary between the strains, we believe the mitochondria may have a significant role in driving strain divergence.

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DOI: 10.24072/pcjournal.77
Orsucci, Marion 1, 2, 3; Moné, Yves 2, 4; Audiot, Philippe 1; Gimenez, Sylvie 2; Nhim, Sandra 2; Naït-Saïdi, Rima 2; Frayssinet, Marie 2; Dumont, Guillaume 2; Boudon, Jean-Paul 5; Vabre, Marin 5; Rialle, Stéphanie 6; Koual, Rachid 6; Kergoat, Gael J. 1; Nagoshi, Rodney N. 7; Meagher, Robert L. 7; d’Alençon, Emmanuelle 2; Nègre, Nicolas 2

1 CBGP, INRAE, IRD, CIRAD, Institut Agro, Univ Montpellier, Montpellier, France
2 DGIMI, Univ Montpellier, INRAE, Montpellier, France
3 Department of Plant Biology, Swedish University of Agricultural Sciences, Uppsala BioCenter and Linnean Centre for Plant Biology, 75007 Uppsala, Sweden
4 Department of Microbiology & Immunology, Center for Advanced Microbial Processing, Drexel University College of Medicine, 245 N. 15th Street, Philadelphia, PA, 19102, USA
5 UE Diascope, INRAE, 34130 Mauguio, France
6 MGX, Univ Montpellier, CNRS, INSERM, Montpellier, France
7 CMAVE USDA-ARS, Gainesville, Florida, USA
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Orsucci, Marion; Moné, Yves; Audiot, Philippe; Gimenez, Sylvie; Nhim, Sandra; Naït-Saïdi, Rima; Frayssinet, Marie; Dumont, Guillaume; Boudon, Jean-Paul; Vabre, Marin; Rialle, Stéphanie; Koual, Rachid; Kergoat, Gael J.; Nagoshi, Rodney N.; Meagher, Robert L.; d’Alençon, Emmanuelle; Nègre, Nicolas. Transcriptional differences between the two host strains of Spodoptera frugiperda (Lepidoptera: Noctuidae). Peer Community Journal, Volume 2 (2022), article  no. e1. doi : 10.24072/pcjournal.77. https://peercommunityjournal.org/articles/10.24072/pcjournal.77/

Peer reviewed and recommended by PCI : 10.24072/pci.evolbiol.100102

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