Intracontinental plant invader shows matching genetic and chemical profiles and might benefit from high defence variation within populations

Tewes, Lisa Johanna; Michling, Florian; Koch, Marcus A.; Müller, Caroline

doi:10.1111/1365-2745.12869

Cited by 31 publications

(50 citation statements)

References 70 publications

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“…The high variation in glucosinolate concentration and diversity within populations found in the present field experiment is in accordance with an earlier study including the same B. orientalis populations kept under laboratory conditions (Tewes et al 2018). This high within-population variation in chemical defence concentration and composition may impede antagonist adaptations, as predicted by the CDH (Wolf et al 2011).…”

Section: Defence and Flowering Start Trade-offs And Intra-populationsupporting

confidence: 92%

“…For example, a high leaf number also correlated with high glucosinolate diversity (Fig. 4a), which can have a negative influence on caterpillar performance (Tewes et al 2018). An effective resource allocation to leaf growth, as also found by Steinlein et al (1996), may represent a feature of B. orientalis that allows the species to exploit the resources of new (disturbed) habitats, when introduced.…”

Section: Resource Allocation and Leaf Production In The First Yearmentioning

confidence: 99%

“…Origin, invasion status and survival of Bunias orientalis populations. Populations were grouped by status according to their ecology, plant frequency or distribution in the origin region (Harvey et al 2010;Tewes et al 2018), following the nomenclature of Richardson et al (2000). The number of plants that survived the winter between 2015 and 2016 are given in relation to the original number.…”

Section: Plant Materials and Common Garden Designmentioning

confidence: 99%

“…The number of plants that survived the winter between 2015 and 2016 are given in relation to the original number. 11/12 † coordinates estimated from origin information ‡ coordinates averaged from four origin populations from which seeds were pooled * named "exotic" in Harvey et al (2010) and Tewes et al (2018) invasive: LT, CB; naturalised: GO, PA), seeds only became available in 2014 and were thus used directly for the experiments. Thus, maternal effects influencing the traits of certain populations cannot be excluded.…”

Section: Plant Materials and Common Garden Designmentioning

confidence: 99%

“…they do not form dominant stands far from parental plants (Harvey et al 2010, Fortuna et al 2014. As defence metabolites, B. orientalis produces several glucosinolates (Tewes et al 2018), which are characteristic for Brassicales and serve important roles in (novel) biotic interactions (Müller 2009). Thus, glucosinolates are valuable target compounds to evaluate relationships between defence and invasion in this species.…”

Section: Introductionmentioning

confidence: 99%

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Syndromes in suites of correlated traits suggest multiple mechanisms facilitating invasion in a plant range-expander

Tewes¹,

Mueller²

2018

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Various mechanisms can facilitate the success of plant invasions simultaneously, but may be difficult to disentangle. In the present study, plants of the range-expanding species Bunias orientalis from native, invasive and naturalised, not yet invasive populations were compared in a field common garden over two years. Plants were grown under two nitrate-regimes and multiple traits regarding growth, defence, antagonist loads and reproduction were measured. A rank-based clustering approach was used to assign correlated traits to distinct suites. These suites were analysed for “syndromes” that are expressed as a function of population origin and/or fertilisation treatment and might represent different invasion mechanisms. Indeed, distinct suites of traits were differentially affected by these factors. The results suggest that several pre-adaptation properties, such as certain growth characteristics and intraspecific chemical variation, as well as post-introduction adaptations to antagonists and resource availability in novel habitats, are candidate mechanisms that facilitate the success of invasive B. orientalis in parallel. It was concluded that rank-based clustering is a robust and expedient approach to integrate multiple traits for elucidating invasion syndromes within individual species. Studying a multitude of traits at different life-history and establishment stages of plants grown under distinct resource treatments reveals species-specific trade-offs and resource sinks and simplifies the interpretation of trait functions for the potential invasive success of plants.

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Section: Defence and Flowering Start Trade-offs And Intra-populationsupporting

confidence: 92%

Section: Resource Allocation and Leaf Production In The First Yearmentioning

confidence: 99%

Section: Plant Materials and Common Garden Designmentioning

confidence: 99%

Section: Plant Materials and Common Garden Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Syndromes in suites of correlated traits suggest multiple mechanisms facilitating invasion in a plant range-expander

Tewes¹,

Mueller²

2018

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Invasive plant species that experience lower herbivory pressure may evolve lower diversities of chemical defense compounds in the exotic range

Oduor

2022

American J of Botany

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Premise: Invasive plant species often escape from specialist herbivores and are more likely to be attacked by generalist herbivores in the exotic range. Consequently, the shifting defense hypothesis predicts that invasive plants will produce higher concentrations of qualitative defense compounds to deter dominant generalist herbivores in the exotic range. Here, I additionally propose a reduced chemical diversity hypothesis (RCDH), which predicts that reduced herbivory pressure will select for invasive plant genotypes that produce lower diversities of chemical defense compounds in the exotic range. Methods: I tested whether (1) invasive Brassica nigra populations express a lower diversity and an overall higher concentration of glucosinolate compounds than native-range B. nigra; (2) Brassica nigra individuals that express high diversities and concentrations of glucosinolate compounds are more attractive to specialist and deterrent to generalist herbivores; and (3) tissues of invasive B. nigra are less palatable than tissues of native-range B. nigra to the generalist herbivores Theba pisana and Helix aspersa. Results: Invasive B. nigra populations produced a significantly lower diversity of glucosinolate compounds, a marginally higher concentration of total glucosinolates, and a significantly higher concentration of sinigrin (the dominant glucosinolate). Leaf tissues of invasive B. nigra were significantly less palatable to T. pisana and marginally less so to H. aspersa. Brassica nigra individuals that expressed high concentrations of total glucosinolate compounds were visited by a low diversity of generalist herbivore species in the field. Conclusions: In line with the RCDH, the lower diversity of glucosinolate compounds produced by invasive B. nigra populations likely resulted from selection imposed by reduced herbivory pressure in the exotic range.

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Understanding the chemodiversity of plants: Quantification, variation and ecological function

Petrén,

Anaia,

Aragam

et al. 2024

Ecological Monographs

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Plants produce a great number of phytochemicals serving a variety of different functions. Recently, the chemodiversity of these compounds (i.e., the diversity of compounds produced by a plant) has been suggested to be an important aspect of the plant phenotype that may shape interactions between plants, their environment, and other organisms. However, we lack an agreement on how to quantify chemodiversity, which complicates conclusions about the functional importance of it. Here, we discuss how chemodiversity (deconstructed into components of richness, evenness and disparity) may relate to different ecologically relevant aspects of the phenotype. Then, we systematically review the literature on chemodiversity to examine methodological practices, explore patterns of variability in diversity across different levels of biological organization, and investigate the functional role of this diversity in interactions between plants and other organisms. Overall, the reviewed literature suggests that high chemodiversity is often beneficial for plants, although a heterogeneity of methodological approaches partly limits what general conclusions can be drawn. Importantly, to support future research on this topic, we provide a framework with a decision tree facilitating choices on which measures of chemodiversity are best used in different contexts and outline key questions and avenues for future research. A more thorough understanding of chemodiversity will provide insights into its evolution and functional role in ecological interactions between plants and their environment.

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Intracontinental plant invader shows matching genetic and chemical profiles and might benefit from high defence variation within populations

Cited by 31 publications

References 70 publications

Syndromes in suites of correlated traits suggest multiple mechanisms facilitating invasion in a plant range-expander

Syndromes in suites of correlated traits suggest multiple mechanisms facilitating invasion in a plant range-expander

Invasive plant species that experience lower herbivory pressure may evolve lower diversities of chemical defense compounds in the exotic range

Understanding the chemodiversity of plants: Quantification, variation and ecological function

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