Assortative Mating and Lack of Temporality Between Corn and Rice Strains of Spodoptera frugiperda (Lepidoptera, Noctuidae) from Central Colombia

Saldamando-Benjumea, C. I.; Estrada-Piedrahíta, Kelly; Velásquez-Vélez, María I.; Bailey, Richard I.

doi:10.1007/s10905-014-9451-7

Cited by 20 publications

(9 citation statements)

References 33 publications

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“…Nevertheless, the results here demonstrated that the host use phenotype is sufficiently consistent to be observed in populations from multiple locations and time periods, supporting it being a fundamental phenotype differentiating the strains. This does not preclude the involvement of other processes, particularly those that contribute to reproductive isolation through assortative mating or hybrid incompatibility as being part of the host strain phenotype [29,48,49]. However, at this time differential host use is the only trait demonstrated in host strain populations from both American continents.…”

Section: Plos Onementioning

confidence: 99%

Observations of genetic differentiation between the fall armyworm host strains

Nagoshi

2022

PLoS ONE

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The threat of invasive species is increasing with the expansion of global trade and habitat disruption. A recent example is the establishment of fall armyworm (FAW), a noctuid moth native to the Americas, into most of the Eastern Hemisphere with projections of significant economic losses on a global scale. The species has traditionally been subdivided into two populations that differ in their propensity to use different plant hosts, a phenotype with clear relevance for identifying crops at risk. However, inconsistencies in the genetic and phenotypic descriptions of these “host strains” has led to controversy about their composition and even existence. In this study, the locus for the Triosephosphate isomerase gene (Tpi) is used both as a host strain marker and for phylogenetic analysis. Association of the host choice phenotype with the Tpi-derived phylogenetic tree uncovered genetic differentiation between populations that supports the existence of the host strains and provided evidence that they are subject to different selection pressures. This correspondence of differential host use with Tpi was demonstrated for populations from a broad geographical range and supports the involvement of one or more Z-chromosome functions controlling the phenotype. Comparisons of collections from multiple locations identified significant differences in the efficacy of different molecular markers that implicate regional variations in host strain behavior.

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Section: Plos Onementioning

confidence: 99%

Observations of genetic differentiation between the fall armyworm host strains

Nagoshi

2022

PLoS ONE

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“…This dissimilarity is not complete, and evidence of hybridization between the strains has been presented [ 39 ]. Although hardly distinguished morphologically, except by differences in wing morphometrics [ 40 ], the two strains show evidence of reproductive isolation, such as differences in the female pheromone composition [ 41 ], and in the period of reproductive activity [ 42 ], fertility loss due to interbreeding between strains [ 43 ], and assortative mating [ 44 ]. There are evidences that CS and RS individuals may also differ in their tolerances to Bt toxins [ 45 ] and to certain insecticides [ 46 , 47 ].…”

Section: Introductionmentioning

confidence: 99%

Loci under selection and markers associated with host plant and host-related strains shape the genetic structure of Brazilian populations of Spodoptera frugiperda (Lepidoptera, Noctuidae)

et al. 2018

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We applied the ddRAD genotyping-by-sequencing technique to investigate the genetic distinctiveness of Brazilian populations of the noctuid moth Spodoptera frugiperda, the fall armyworm (FAW), and the role of host-plant association as a source of genetic diversification. By strain-genotyping all field-collected individuals we found that populations collected from corn were composed primarily of corn-strain individuals, while the population collected from rice was composed almost entirely of rice-strain individuals. Outlier analyses indicated 1,184 loci putatively under selection (ca. 15% of the total) related to 194 different Gene Ontologies (GOs); the most numerous GOs were nucleotide binding, ATP binding, metal-ion binding and nucleic-acid binding. The association analyses indicated 326 loci associated with the host plant, and 216 loci associated with the individual strain, including functions related to Bacillus thuringiensis and insecticide resistance. The genetic-structure analyses indicated a moderate level of differentiation among all populations, and lower genetic structure among populations collected exclusively from corn, which suggests that the population collected from rice has a strong influence on the overall genetic structure. Populations of S. frugiperda are structured partially due to the host plant, and pairs of populations using the same host plant are more genetically similar than pairs using different hosts. Loci putatively under selection are the main factors responsible for the genetic structure of these populations, which indicates that adaptive selection on important traits, including the response to control tactics, is acting in the genetic differentiation of FAW populations in Brazil.

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“…The results are consistent with the hypothesis that the host strains are at an intermediate stage of sympatric speciation with differential host preference playing a fundamental role in their divergence. This does not preclude the involvement of other processes, particularly those that contribute to reproductive isolation through assortative mating or hybrid incompatibility, though it appears that reported strain differences in pheromones or mating times may be more region speci c than a general trait of the strains 22,43,44 . The continued observation of strain speci c host use across both American continents indicate that this phenotype is a fundamental characteristic of the species that needs to be taken into consideration when developing monitoring and mitigation strategies.…”

Section: Discussionmentioning

confidence: 99%

The phylogeny of host choice in a global agricultural pest undergoing sympatric speciation.

Nagoshi

2022

Preprint

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The threat of invasive species is increasing with the expansion of global trade and habitat disruption. A recent example is the spread of fall armyworm (FAW), a noctuid moth native to the Americas, into most of the Eastern Hemisphere with projections of significant economic losses. The species is subdivided into two populations that differ in their plant host specificity. However, inconsistencies in the genetic and phenotypic definitions of these “host strains” has led to controversy about their existence, which could significantly impact current monitoring and mitigation protocols. Here is described a phylogenetic definition of the host strains that confirm their relevance and provide improved quantification of their genetic differentiation and selection pressures. The results support the traditional view of these populations being at an intermediate stage of sympatric speciation driven by differential host use while also describing a new approach to investigate the evolution of this important global pest.

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Assortative Mating and Lack of Temporality Between Corn and Rice Strains of Spodoptera frugiperda (Lepidoptera, Noctuidae) from Central Colombia

Cited by 20 publications

References 33 publications

Observations of genetic differentiation between the fall armyworm host strains

Observations of genetic differentiation between the fall armyworm host strains

Loci under selection and markers associated with host plant and host-related strains shape the genetic structure of Brazilian populations of Spodoptera frugiperda (Lepidoptera, Noctuidae)

The phylogeny of host choice in a global agricultural pest undergoing sympatric speciation.

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