Abstract
Recent carbon dioxide (CO2) concentrations promoted higher parthenin concentrations in an invasive Parthenium hysterophorus biotype. Mean concentrations of parthenin, an allelopathic and defensive sesquiterpene lactone, were 49% higher at recent (~400 ppm) than at mid-twentieth-century (~300 ppm) CO2 concentrations, but did not vary in a non-invasive biotype, suggesting that recent increases in atmospheric CO2 may have already altered the chemistry of this destructive weed, potentially contributing to its invasive success.
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All data collected can be viewed in the Supplementary Information, including plant dry weights over time (Supplementary Table 3) and concentrations of parthenin (Supplementary Table 4).
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Acknowledgements
We thank R. Belz for sharing the parthenin standard, without which this study would not have been possible. M. Kramer of USDA’s Northeast Area Statistics Group provided invaluable assistance for which we are grateful. A.A.B. and S.W.A. acknowledge financial support from the University of Queensland, Australia, making possible A.A.B.’s trip to USDA-ARS Beltsville, which laid the foundation of this collaborative project.
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The study was initially conceived by A.A.B., L.H.Z. and C.R. Study design and methods were developed by J.W., S.M.A., L.H.Z., A.A.B., D.H.F. and C.R., with guidance from S.W.A. The experiment was carried out by J.W. and S.M.A. J.W. extracted parthenin and C.R. quantified it. J.W. analysed the data and wrote the first draft, which was expanded and reviewed by S.W.A., D.H.F., L.H.Z., A.A.B. and C.R.
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Rice, C., Wolf, J., Fleisher, D.H. et al. Recent CO2 levels promote increased production of the toxin parthenin in an invasive Parthenium hysterophorus biotype. Nat. Plants 7, 725–729 (2021). https://doi.org/10.1038/s41477-021-00938-6
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DOI: https://doi.org/10.1038/s41477-021-00938-6
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