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Spodoptera frugiperda (Lepidoptera: Noctuidae) host-plant variants: two host strains or two distinct species?

Pascaline Dumas 1, 2, * Fabrice Legeai 3, 4 Claire Lemaitre 5, 3 Erwan Scaon 5 Marion Orsucci 1, 2 Karine Labadie 6 Sylvie Gimenez 2 Anne Laure Clamens 1 Hélène Henri 7 Fabrice Vavre 8, 9 Jean-Marc Aury 6 Philippe Fournier 2 Gael Kergoat 1 Emmanuelle d'Alençon 2
* Corresponding author
1 UMR CBGP - Centre de Biologie pour la Gestion des Populations
2 DGIMI - Diversité, Génomes & Interactions Microorganismes - Insectes [Montpellier]
3 GenScale - Scalable, Optimized and Parallel Algorithms for Genomics
Inria Rennes – Bretagne Atlantique , IRISA-D7 - GESTION DES DONNÉES ET DE LA CONNAISSANCE
4 IGEPP - Institut de Génétique, Environnement et Protection des Plantes
5 Plateforme bioinformatique GenOuest [Rennes]
IRISA-D7 - GESTION DES DONNÉES ET DE LA CONNAISSANCE, UR1 - Université de Rennes 1, Plateforme Génomique Santé Biogenouest®, Inria Rennes – Bretagne Atlantique
6 IG - Institut de Génomique d'Evry
7 LBBE - Laboratoire de Biométrie et Biologie Evolutive - UMR 5558
8 ERABLE - Equipe de recherche européenne en algorithmique et biologie formelle et expérimentale
Inria Grenoble - Rhône-Alpes
9 Génétique et évolution des interactions hôtes-parasites
GINSENG - Département génétique, interactions et évolution des génomes [LBBE]
Abstract : The moth Spodoptera frugiperda is a well-known pest of crops throughout the Americas, which consists of two strains adapted to different host-plants: the first feeds preferentially on corn, cotton and sorghum whereas the second is more associated with rice and several pasture grasses. Though morphologically indistinguishable, they exhibit differences in their mating behavior, pheromone compositions, and show development variability according to the host-plant. Though the latter suggest that both strains are different species, this issue is still highly controversial because hybrids naturally occur in the wild, not to mention the discrepancies among published results concerning mating success between the two strains. In order to clarify the status of the two host-plant strains of S. frugiperda, we analyze features that possibly reflect the level of post-zygotic isolation: (1) first generation (F1) hybrid lethality and sterility; (2) patterns of meiotic segregation of hybrids in reciprocal second generation (F2), as compared to the meiosis of the two parental strains. We found a significant reduction of mating success in F1 in one direction of the cross and a high level of microsatellite markers showing transmission ratio distortion in the F2 progeny. Our results support the existence of post-zygotic reproductive isolation between the two laboratory strains and are in accordance with the marked level of genetic differentiation that was recovered between individuals of the two strains collected from the field. Altogether these results provide additional evidence in favor of a sibling species status for the two strains.
Keywords : Microsatellite marker Host-races Segregation distortion Spodoptera frugiperda Post-zygotic isolation
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Pascaline Dumas, Fabrice Legeai, Claire Lemaitre, Erwan Scaon, Marion Orsucci, et al.. Spodoptera frugiperda (Lepidoptera: Noctuidae) host-plant variants: two host strains or two distinct species?. Genetica, Springer Verlag, 2015, 143 (3), pp.305-316. ⟨10.1007/s10709-015-9829-2⟩. ⟨hal-01208780v2⟩

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