Geographic distribution of terpenoid chemotypes in<i>Tanacetum vulgare</i>mediates tansy aphid occurrence and abundance

Rahimova, Humay; Neuhaus-Harr, Annika; Clancy, Mary V.; Guo, Yongbo; Junker, Robert R.; Ojeda-Prieto, Lina; Petrén, Hampus; Senft, Matthias; Zytynska, Sharon E.; Weisser, Wolfgang W.; Heinen, Robin; Schnitzler, Jörg‐Peter

doi:10.1101/2023.06.19.545570

Cited by 3 publications

References 65 publications

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Intraspecific chemical variation ofTanacetum vulgareaffects plant growth and reproductive traits in field plant communities

Ojeda-Prieto

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et al. 2023

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Intraspecific plant chemodiversity plays a fundamental role in interactions between plants and their interaction partners. Individuals of a plant species can be clustered into chemotypes by dominant chemical compounds or their chemical composition. Intraspecific stands of plant communities can vary in the number and type of plant chemotypes that grow in them (i.e., chemotype richness). Chemotypic diversity at the stand level is a special case of intraspecific diversity that is predicted to increase stand-level ecosystem functioning. Here we describe a biodiversity experiment in which we manipulated intraspecific plant chemodiversity at the plot level using six different chemotypes of common tansy (Tanacetum vulgare L., Asteraceae). We tested the effects of chemotype identity and plot-level chemotype richness (1-6) on plant growth and reproductive traits under field conditions. We found that plant chemotypes differed in growth and reproductive traits, both at the plant level, and at the plot level, and that reproductive plant traits and plot-level trait means were affected by tansy chemodiversity. The plot-level trait means were influenced by the presence or absence of certain chemotypes in a plot. The community's headspace terpenoid blend minimally reflected plot-level leaf terpenoid compound blends. Although tradeoffs between chemodiversity and growth and reproductive traits were observed, the links between chemodiversity and traits expressed themselves in the early establishment but dissolved over time, suggesting that different chemotypes adopt different growth strategies, which may facilitate their establishment in nature. This long-term field experiment will allow for further investigation of the consequences of intraspecific chemodiversity for plant-insect interactions and insect community assembly.

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Intraspecific chemical variation ofTanacetum vulgareaffects plant growth and reproductive traits in field plant communities

Ojeda-Prieto

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et al. 2023

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Flower visitor groups show differential responses to individual and plot-level chemodiversity with consequences for plant fitness

Sasidharan,

Grond,

Champion

et al. 2023

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Chemodiversity, the diversity of specialised metabolites, plays a crucial role in mediating interactions between plants and animals, including insect herbivores and mutualists. Chemodiversity can be observed at both the individual and the population level. However, the impacts of chemodiversity at these two levels on interactions between plants and floral visitors, mainly pollinators and floral herbivores (florivores), are only poorly understood.This study aimed to investigate the effects of chemodiversity at both individual and plot level on pollinators and florivores, examining their mutual interactions. To investigate these questions, we used individuals of the perennialTanacetum vulgarediffering in their terpenoid composition, representing so-called chemotypes. We planted individuals of five distinct chemotypes in a common garden design with homogeneous (five plants of the same chemotype) and heterogeneous (five different chemotypes) plots and observed flower visits in dependence of individual chemotype and plot type. Seeds were collected from a subset of plants and germination rates determined.Our findings revealed that chemodiversity at the plot level significantly influenced pollinator visitation, with more visits on plants of heterogeneous plots. We also observed marginally more pollinators on one of the chemotypes grown in homogeneous plots. In contrast, chemotype but not plot type had a significant effect on florivore visits. Pollinator and florivore species richness did not vary with plot type. Furthermore, a negative correlation was observed between pollinator and florivore visits in one year, suggesting competitive interactions between these two groups. Germination rates were positively correlated with pollinator visits and affected by chemotype but not by florivore visits or plot type.Synthesis.Our study emphasizes the significance of the scale at which different chemical profiles are perceived by flower visitors, potentially influencing the reproductive fitness of plants. Exploring the ecology of these visitors and the varying selection pressures they exert on floral chemistry can help elucidating the evolutionary processes that maintain chemodiversity in natural environments.

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Intraspecific chemical variation of Tanacetum vulgare affects plant growth and reproductive traits in field plant communities

Ojeda‐Prieto,

Medina‐van Berkum,

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et al. 2024

Plant Biol J

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The study investigated the impact of intraspecific plant chemodiversity on plant growth and reproductive traits at both the plant and plot levels. It also aimed to understand how chemodiversity at stand level affects ecosystem functioning and plant–plant interactions. We describe a biodiversity experiment in which we manipulated intraspecific plant chemodiversity at the plot level using six different chemotypes of common tansy (Tanacetum vulgare L., Asteraceae). We tested the effects of chemotype identity and plot‐level chemotype richness on plant growth and reproductive traits and plot‐level headspace emissions. The study found that plant chemotypes differed in growth and reproductive traits and that traits were affected by the chemotype richness of the plots. Although morphological differences among chemotypes became less pronounced over time, reproductive phenology patterns persisted. Plot‐level trait means were also affected by the presence or absence of certain chemotypes in a plot, and the direction of the effect depended on the specific chemotype. However, chemotype richness did not lead to overyielding effects. Lastly, chemotype blends released from plant communities were neither richer nor more diverse with increasing plot‐level chemotype richness, but became more dissimilar as they became more dissimilar in their leaf terpenoid profiles. We found that intraspecific plant chemodiversity is crucial in plant–plant interactions. We also found that the effects of chemodiversity on plant growth and reproductive traits were complex and varied depending on the chemotype richness of the plots. This long‐term field experiment will allow further investigation into plant–insect interactions and insect community assembly in response to intraspecific chemodiversity.

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Geographic distribution of terpenoid chemotypes inTanacetum vulgaremediates tansy aphid occurrence and abundance

Cited by 3 publications

References 65 publications

Intraspecific chemical variation ofTanacetum vulgareaffects plant growth and reproductive traits in field plant communities

Intraspecific chemical variation ofTanacetum vulgareaffects plant growth and reproductive traits in field plant communities

Flower visitor groups show differential responses to individual and plot-level chemodiversity with consequences for plant fitness

Intraspecific chemical variation of Tanacetum vulgare affects plant growth and reproductive traits in field plant communities

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