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Distinctive foliar features and volatile profiles in three Ambrosia species (Asteraceae)

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Abstract

Main conclusion

Ambrosia species differ both in their trichome types and in metabolic profiles of leaf volatiles. The current study provides tools for easier taxonomic identification of ragweed species.

Abstract

The genus Ambrosia (Asteraceae) includes some of the most noxious allergenic invasive weeds in the world. Due to high polymorphism in this genus, identification of species is often difficult. This study focuses on microscopic investigation of foliar features and GC-MS identification of the main leaf volatile components of three Ambrosia species currently found in Israel—invasive species Ambrosia confertiflora and A. tenuifolia, and transient A. grayi. A. confertiflora and A. tenuifolia have three trichome types: non-glandular trichomes, capitate glandular trichomes and linear glandular trichomes. Their non-glandular trichomes and capitate trichomes have distinct structures and can serve as taxonomic characters. A. grayi (the least successful invader) has only very dense covering trichomes. All three Ambrosia species have secretory structures in their leaf midrib. A. confertiflora, the most problematic invasive plant in Israel, had a ten times higher volatiles content than the other two species. In A. confertiflora, the most abundant volatiles were chrysanthenone (25.5%), borneol (18%), germacrene D and (E)-caryophyllene (both around 12%). In A. tenuifolia, the most abundant volatiles were β-myrcene (32.9%), (2E)-hexenal (13%) and 1,8-cineole (11.7%). In A. grayi, the most abundant volatiles were β-myrcene (17.9%), germacrene D (17.8%) and limonene (14%). The three examined species have distinct trichome types and metabolic profiles. Non-glandular trichomes show structural diversification between species and are a good descriptive character. Considering the anthropocentric significance of this highly problematic genus, the current study provides tools for easier identification of ragweed species.

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Abbreviations

GC–MS:

Gas chromatography–Mass spectrometry,

HS-SPME:

Headspace-Solid-phase microextraction

SEM:

Scanning Electron Microscopy

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Acknowledgements

The study was supported by a grant N 3-15745 from the Israel Ministry of Science. We wish to thank Danielle Neta for growing plant material of A. grayi and Jotham Ziffer-Berger for his insights into plant taxonomy.

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Correspondence to Ilana Shtein.

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The authors declare that they have no conflicts of interest.

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Communicated by Dorothea Bartels.

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Supplementary Information

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Supplementary file1 S1 Leaf polymorphism in A. confertiflora (a) and A. tenuifolia (b) (TIF 13273 KB)

425_2023_4113_MOESM2_ESM.tif

Supplementary file2 S2 Larger magnification of secretory cavities in A. confertiflora (a), A. tenuifolia (b) and A. grayi (c) leaf veins (black arrows). Light microscopy, Safranin-Alcian Blue stain (TIF 9490 KB)

Supplementary file3 (DOCX 36 KB)

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Matzrafi, M., Wolberg, S., Abu-Nassar, J. et al. Distinctive foliar features and volatile profiles in three Ambrosia species (Asteraceae). Planta 257, 79 (2023). https://doi.org/10.1007/s00425-023-04113-3

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  • DOI: https://doi.org/10.1007/s00425-023-04113-3

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