Host shift induces changes in mate choice of the seed predator Acanthoscelides obtectus via altered chemical signalling

Vuts, József; Woodcock, C. M.; König, Lisa; Powers, Stephen J.; Pickett, John A.; Szentesi, Árpád; Birkett, Michael A.

doi:10.1371/journal.pone.0206144

Cited by 8 publications

(12 citation statements)

References 66 publications

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“…Pheromone divergence between populations linked to differences in host plants has also been hypothesized in the pine and larch strain of larch budmoth (Zeiraphera diniana) [78] and the chestnut tortrix (Cydia splendana) [79], and may represent the initial step towards reproductive isolation in these species. Changes in host plants, however, do not automatically lead to differences in sex pheromones [80] or to host shift [81], suggesting that other processes are also involved in speciation events.…”

Section: Ecological Speciationmentioning

confidence: 99%

Evolutionary importance of intraspecific variation in sex pheromones

Pasqual

Groot

Mappes

et al. 2021

Trends in Ecology & Evolution

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Section: Ecological Speciationmentioning

confidence: 99%

Evolutionary importance of intraspecific variation in sex pheromones

Pasqual

Groot

Mappes

et al. 2021

Trends in Ecology & Evolution

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“…Nine of these legume species supported development into adult stage even if the seed coats were intact. Besides the two Phaseolus species, rearing in laboratories is possible on chickpea through generations [18,40], and occasional infestations occur in stores on garden peas or faba beans (Szentesi unpubl. results).…”

Section: Discussionmentioning

confidence: 99%

How the seed coat affects the mother’s oviposition preference and larval performance in the bean beetle (Acanthoscelides obtectus, Coleoptera: Chrysomelidae, Bruchinae) in leguminous species

Szentesi

2021

BMC Ecol Evo

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Background The host specificity and host range of the dry bean beetle, Acanthoscelides obtectus (Coleoptera: Chrysomelidae, Bruchinae), a seed predator of beans, is poorly known. In addition, the female oviposition preference and larval performance relationship is complicated by the respective importance of seed coat and cotyledon, because, paradoxically, females lay eggs on the basis of stimuli of the seed coat alone, without directly being able to assess the quality of the cotyledon’s suitability for larval development. Conversely, the thickness of seed coat may prevent first instar larvae from entering the seeds, even if cotyledons are suitable for development. Methods The seeds of 62 leguminous species and 75 cultivars and accessions occurring in Hungary were evaluated for preference-performance relations. The preference of female bean beetles for seeds was measured in no-choice egg-laying tests. The ability of first instar larvae to overcome the seed coat as a physical barrier was tested with intact seed coat, while pre-drilled seed coats allowed the larvae to assess the suitability of cotyledon for development. The number of emerging adults was recorded. The thickness of seed coats and the weight of seeds were measured. Nonparametric tests and logistic regression were used for the statistical analyses of data and effect sizes were also calculated. Results Seeds of 18 leguminous species (35% of them Lathyrus) supported larval development to adults if the seed coat was pre-drilled; however, only nine leguminous species supported development to adults if the seed coat was intact. Seed coat thickness beyond a critical threshold of 0.1 mm strongly influenced survival of first instar larvae. There was no overall positive correlation between oviposition preference and larval performance, except for 16 so-called acceptable non-hosts (Kendall’s τ = 0.3088). A. obtectus females also showed an ovipositional hierarchy of legume species even in no-choice tests. Conclusions The results suggest that whereas the use of some acceptable non-host species by the A. obtectus is possible in seed stores, the same is unlikely under outdoor conditions, where the recognition of a diverse set of seed pod-related compounds would be necessary to induce egg-laying.

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“…Besides the two Phaseolus species, rearing in laboratories is possible on chickpea through generations [18,24], and occasional infestation is present in stores on garden peas or faba beans (Szentesi unpubl. results).…”

Section: Discussionmentioning

confidence: 99%

How bean weevil (Acanthoscelides obtectus, Coleoptera, Bruchinae) larvae die on legume seeds

Szentesi

2020

Preprint

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Background The host specificity of the dry bean weevil, Acanthoscelides obtectus Say (Coleoptera: Bruchinae), a seed predator of beans, is not properly known. Occasional use of leguminous seeds other than beans is reported, however the sphere of possible wild and cultivated hosts is uncertain. Female oviposition preference and larval performance relationship is complicated by the respective importance of seed coat and cotyledon, because paradoxically, females must exercise oviposition preference on the basis of stimuli provided by the seed coat alone, without directly being able to assess the quality of cotyledon’s suitability for larval development.Results Host specificity and host range investigations carried out on seeds of 62 grown and naturally occurring legume species and 82 cultivars of Phaseolus, Pisum, Glycine, Lens and others in Hungary, using no-choice tests for egg-laying, and intact or pierced seed coat for larval development in seeds, showed that there were 18 plant species (35% of them Lathyrus) that supported larval development to adults, however, only nine species (4 of 17 Glycine max accessions, Vigna unguiculata, V. angularis, Phaseolus vulgaris, Ph. coccineus, Cicer arietinum, Vicia faba, Lathyrus sativus and 13 of 27 Pisum sativum accessions) allowed it if the seed coat was intact. Furthermore, there was no overall positive correlation between oviposition preference and larval performance, with the exception for the so-called acceptable non-hosts (Kendall’s τ = 0.3088). Bean weevil females also demonstrated an ovipositional hierarchy of legume species even in no-choice tests.Conclusions Host range expansion is not probable with the bean weevil, primarily because it would require the recognition of basically different oviposition substrates (pods) among outdoor conditions.

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Host shift induces changes in mate choice of the seed predator Acanthoscelides obtectus via altered chemical signalling

Cited by 8 publications

References 66 publications

Evolutionary importance of intraspecific variation in sex pheromones

Evolutionary importance of intraspecific variation in sex pheromones

How the seed coat affects the mother’s oviposition preference and larval performance in the bean beetle (Acanthoscelides obtectus, Coleoptera: Chrysomelidae, Bruchinae) in leguminous species

How bean weevil (Acanthoscelides obtectus, Coleoptera, Bruchinae) larvae die on legume seeds

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