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Research article - Peer-reviewed, 2020

Plant-Induced Transgenerational Plasticity Affecting Performance but Not Preference in a Polyphagous Moth

Roesvik, Axel; Lhomme, Patrick; Khallaf, Mohammed A.; Anderson, Peter

Abstract

Environmental variation experienced by a single genotype can induce phenotypic plasticity in various traits, such as behavioural, physiological and developmental characteristics. It can occur within the lifetime of an individual through within-generation phenotypic plasticity (WGP) or vertically across generations through transgenerational phenotypic plasticity (TGP). However, knowledge about TGP and the co-occurrence of WGP and TGP is still limited. In insect host-plant selection, the ability to alter phenotypic traits through WGP is well documented while the importance of TGP and the possible co-occurrence between the two is largely unknown. Host-plant selection of both larvae and adults of the polyphagous mothSpodoptera littoraliscan be modified by previous experience through WGP. Thus, the aim of this study was to investigate if parental host-plant experience can influence host-plant choice behaviour and performance ofS. littoralisoffspring through TGP. For this, we tested effects of rearing parents on different host plants on the offspring's first instar larval migration and host plant choice, larval development and adult oviposition. A transgenerational effect on larval development was found, with increased pupal weight on a matching host-plant diet to that of the parent, when larvae were reared on cotton (good larval host plant) while no such effect was found on maize (poor larval host plant). These findings indicate that TGP ofS. littoralisprogeny development traits may only occur under favourable conditions. Parental diet did not affect larval host plant choice or migration. Furthermore, no effect of parental diet was found on offspring oviposition behaviour, indicating that adult female host-plant selection is governed by innate preference hierarchy and WGP, rather than TGP. Thus, parental diet may influence offspring performance but not behaviour, indicating that WGP is most important for host-plant selection behaviours inS. littoralis, but TGP can affect progeny development. If so, the importance of different types of plasticity may vary among traits ofS. littoralisassociated with host plant utilisation.

Keywords

within-generation phenotypic plasticity; transgenerational phenotypic plasticity; anticipatory plasticity; larval performance; insect behaviour; Lepidoptera; Spodoptera littoralis

Published in

Frontiers in Ecology and Evolution
2020, volume: 8, article number: 254
Publisher: FRONTIERS MEDIA SA

Authors' information

Swedish University of Agricultural Sciences, Department of Plant Protection Biology
Lhomme, Patrick
Swedish University of Agricultural Sciences, Department of Plant Protection Biology
Lhomme, Patrick
International Center for Agricultural Research in the Dry Areas (ICARDA)
Khallaf Ali, Mohammed
Swedish University of Agricultural Sciences, Department of Plant Protection Biology
Khallaf Ali, Mohammed
Max Planck Institute for Chemical Ecology
Swedish University of Agricultural Sciences, Department of Plant Protection Biology

UKÄ Subject classification

Ecology
Behavioral Sciences Biology
Evolutionary Biology

Publication Identifiers

DOI: https://doi.org/10.3389/fevo.2020.00254

URI (permanent link to this page)

https://res.slu.se/id/publ/107847