The role of inbreeding and outbreeding in herbivore resistance and tolerance in Vincetoxicum hirundinaria

Muola, Anne; Mutikäinen, Pia; Laukkanen, Liisa; Lilley, Marianna; Leimu, Roosa

doi:10.1093/aob/mcr174

Cited by 19 publications

(31 citation statements)

References 70 publications

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“…For a specialist moth, a vigorous outbred host plant may appear to be a more suitable egg deposition site compared with an inbred plant [31]. However, the preference was unexpected given that A. asclepiadis larvae reach higher biomasses on inbred plants [5,9]. Other species of Lepidoptera have previously been found to oviposit on plants on which the performance of their offspring is not maximized [21][22][23].…”

Section: Discussionmentioning

confidence: 99%

“…In each individual plant, we selfpollinated five flowers with pollen from a different flower of the same plant and cross-pollinated five flowers with pollen from another randomly chosen individual to obtain inbred and outbred plants, respectively. We allowed the seeds to germinate in the greenhouse in the following year (2008) and, once the seedlings started growing, they were transplanted into larger pots (0.9 l) with standard potting soil (Kekkilä) in 2009 (for a more detailed description of the pollination procedure, see [9]). For the experiment, we chose six inbred and six outbred seedlings that were of similar size from each of the 10 maternal families.…”

Section: (B) Plant and Herbivore Materialsmentioning

confidence: 99%

“…In plants, inbreeding modifies many resistance traits such as concentrations of secondary compounds [4,5], structural defences [6] and emissions of volatile compounds [7]. Consequently, inbreeding depression in plants is stronger under herbivory, and inbred plant individuals commonly experience greater herbivore damage compared with outbred individuals [3,[8][9][10]. In herbivores, inbreeding reduces for example performance, fecundity and egg hatching rate [5,11].…”

Section: Introductionmentioning

confidence: 99%

“…We know that A. asclepiadis and V. hirundinaria suffer from inbreeding depression in larval performance and resistance, respectively [5,9]. Here, we turn our focus to the effects of inbreeding on different life-history stages of the herbivore (adult, egg) and additional plant traits (apparency, indirect defences) in order to more thoroughly understand the effects of inbreeding at various stages of the plant -herbivore interaction.…”

Section: Introductionmentioning

confidence: 99%

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Preference for outbred host plants and positive effects of inbreeding on egg survival in a specialist herbivore

et al. 2014

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Inbreeding can profoundly affect the interactions of plants with herbivores as well as with the natural enemies of the herbivores. We studied how plant inbreeding affects herbivore oviposition preference, and whether inbreeding of both plants and herbivores alters the probability of predation or parasitism of herbivore eggs. In a laboratory preference test with the specialist herbivore moth Abrostola asclepiadis and inbred and outbred Vincetoxicum hirundinaria plants, we discovered that herbivores preferred to oviposit on outbred plants. A field experiment with inbred and outbred plants that bore inbred or outbred herbivore eggs revealed that the eggs of the outbred herbivores were more likely to be lost by predation, parasitism or plant hypersensitive responses than inbred eggs. This difference did not lead to differences in the realized fecundity as the number of hatched larvae did not differ between inbred and outbred herbivores. Thus, the strength of inbreeding depression in herbivores decreases when their natural enemies are involved. Plant inbreeding did not alter the attraction of natural enemies of the eggs. We conclude that inbreeding can significantly alter the interactions of plants and herbivores at different life-history stages, and that some of these alterations are mediated by the natural enemies of the herbivores.

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Section: Discussionmentioning

confidence: 99%

Section: (B) Plant and Herbivore Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Preference for outbred host plants and positive effects of inbreeding on egg survival in a specialist herbivore

et al. 2014

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“…Previous work indicates that lepidopteran larvae are able to modify host plant preferences through associative learning (Pszczolkowski andBrown 2005, Blackiston et al 2008). Since generalist herbivores have a larger range of host plants from which to choose, associative learning is expected to have a greater fitness benefit to generalists than specialists (Bernays 2001 The specialist Abrostola asclepiadis did not differ in biomass when reared on inbred versus outbred Vincetoxicum hirundinaria (Muola et al 2011). Studies on Solanum carolinense and its specialist Manduca sexta demonstrate that M. sexta performs best on inbred plants (Delphia et al 2009, Campbell et al 2012).…”

Section: Discussionmentioning

confidence: 99%

Variation in Volatile Emission in Mimulus guttatus and Implications for Plant-Insect Interactions

Haber¹

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The volatile compounds emitted from plants function as key host-location cues for their insect visitors. Floral volatiles guide pollinators to nectar and pollen, and in turn, pollinators initiate plant reproduction, potentially promoting a mutualistic interaction. Constitutive and herbivore-induced foliar volatiles function as an important plant defense by deterring herbivores and attracting natural enemies of herbivores. Given the importance of plant volatiles in insect behavior, variation in volatile phenotypes is expected to affect insect visitation patterns, and consequently, plant reproductive success and susceptibility to herbivores. Inbreeding is an important source of genetic variation that it is extremely common in natural populations of flowering plants. Since inbreeding increases homozygosity, inbreeding could increase expression of recessive alleles that disrupt biosynthesis of volatile compounds. In previous work, inbreeding in the mixed-mating herb Mimulus guttatus (yellow monkeyflower) decreased pollinator attraction and resistance to herbivory. However, the plant traits underlying these effects are This dissertation is one of only a few studies to examine effects of inbreeding on plant volatile profiles, and it is the first study to demonstrate that innate olfactory preferences of bumblebees can override learned preferences for floral scents. It is also among the first to differentiate the responses of specialist and generalist herbivores to inbreeding effects in their host. The findings in this dissertation enhance our understanding of the ecology and evolution of plant-insect interactions, which can have important implications for the evolution of plant mating systems and the vulnerability of small populations.

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Release from natural enemies mitigates inbreeding depression in native and invasive Silene latifolia populations

Schrieber

Wolf

Wypior

et al. 2019

Ecology and Evolution

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Inbreeding and enemy infestation are common in plants and can synergistically reduce their performance. This inbreeding ×environment (I × E) interaction may be of particular importance for the success of plant invasions if introduced populations experience a release from attack by natural enemies relative to their native conspecifics. Here, we investigate whether inbreeding affects plant infestation damage, whether inbreeding depression in growth and reproduction is mitigated by enemy release, and whether this effect is more pronounced in invasive than native plant populations. We used the invader Silene latifolia and its natural enemies as a study system. We performed two generations of experimental out‐ and inbreeding within eight native (European) and eight invasive (North American) populations under controlled conditions using field‐collected seeds. Subsequently, we exposed the offspring to an enemy exclusion and inclusion treatment in a common garden in the species’ native range to assess the interactive effects of population origin (range), breeding treatment, and enemy treatment on infestation damage, growth, and reproduction. Inbreeding increased flower and leaf infestation damage in plants from both ranges, but had opposing effects on fruit damage in native versus invasive plants. Inbreeding significantly reduced plant fitness; whereby, inbreeding depression in fruit number was higher in enemy inclusions than exclusions. This effect was equally pronounced in populations from both distribution ranges. Moreover, the magnitude of inbreeding depression in fruit number was lower in invasive than native populations. These results support that inbreeding has the potential to reduce plant defenses in S. latifolia, which magnifies inbreeding depression in the presence of enemies. However, future studies are necessary to further explore whether enemy release in the invaded habitat has actually decreased inbreeding depression and thus facilitated the persistence of inbred founder populations and invasion success.

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The role of inbreeding and outbreeding in herbivore resistance and tolerance in Vincetoxicum hirundinaria

Cited by 19 publications

References 70 publications

Preference for outbred host plants and positive effects of inbreeding on egg survival in a specialist herbivore

Preference for outbred host plants and positive effects of inbreeding on egg survival in a specialist herbivore

Variation in Volatile Emission in Mimulus guttatus and Implications for Plant-Insect Interactions

Release from natural enemies mitigates inbreeding depression in native and invasive Silene latifolia populations

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