2025/10/22 by Maximilian Hanusch, Stefan Dötterl, Anne‐Amélie C. Larue‐Kontić +2 · 2 voices
Agricultural and Biological Sciences · Biochemistry, Genetics and Molecular Biology · #Plant Parasitism and Resistance #Plant and Fungal Species Descriptions #Plant and animal studies
paper · pdf · doi:10.1111/nph.70600
openalex publication_date 2025/10/22 · openalex created_date 2025/10/24 · openalex updated_date 2026/06/24
Floral scents are complex blends of volatile compounds, yet the influence of floral scent chemodiversity, the richness, evenness, and functional disparity of phytochemical compounds in shaping interactions with flower visitors and microbes remains largely unexplored. Using a dataset of alpine plant species, we investigated how floral scent chemodiversity affects flower visitor and bacterial diversities on flowers. Our results reveal that high floral scent chemodiversity is associated with increased flower visitor richness but reduced bacterial richness on flowers. These findings led us to propose the 'Filthy Pollinator Hypothesis'. Our hypothesis rests on two core ideas: flowers with chemodiverse scents attract a broader range of flower visitors, thereby increasing the potential for microbial transmission; and floral scent chemodiversity acts as a selective filter, mitigating the risks of unwanted microbial colonization by preventing the establishment of detrimental microbes while still allowing the establishment of a healthy microbiome. Floral scent chemodiversity may therefore not only shape the specialization/generalization of flower visitor assemblages but also act as a regulatory mechanism for microbial communities. By highlighting the multifunctionality of chemodiversity in structuring plant-animal and plant-microbe interactions, our study advances the understanding of chemodiversity and underscores its importance in plant ecology.