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Rising Atmospheric Carbon Dioxide and Potential Impacts on the Growth and Toxicity of Poison Ivy (Toxicodendron radicans)

Published online by Cambridge University Press:  20 January 2017

L. H. Ziska ,
R. C. Sicher ,
K. George  and
J. E. Mohan
L. H. Ziska*
Affiliation:
USDA-ARS, Crop Systems and Global Change Laboratory, Beltsville, MD 20705
R. C. Sicher
Affiliation:
USDA-ARS, Crop Systems and Global Change Laboratory, Beltsville, MD 20705
K. George
Affiliation:
Ecosystems Center, Marine Biological Laboratory, Woods Hole, MA 02543
J. E. Mohan
Affiliation:
USDA-ARS, Crop Systems and Global Change Laboratory, Beltsville, MD 20705
*
Corresponding author's E-mail: [email protected]
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Abstract

Because of its ability to induce contact dermatitis, the establishment and spread of poison ivy is recognized as a significant public health concern. In the current study, we quantified potential changes in the biomass and urushiol content of poison ivy as a function of incremental changes in global atmospheric carbon dioxide concentration (CO2). We also examined the rate of new leaf development following leaf removal to simulate responses to herbivory as functions of both CO2 and plant size. The experimental CO2 values (300, 400, 500. and 600 µmol mol−1) corresponded approximately to the concentration that existed during the middle of the 20th century, the current concentration and near and long-term projections for this century (2050 and 2090), respectively. Over 250 d, increasing CO2 resulted in significant increases in leaf area, leaf and stem weight, and rhizome length relative to the 300 µmol mol−1 baseline with the greatest relative increase occurring from 300 to 400 µmol mol−1. There was a nonsignificant (P = 0.18) increase in urushiol concentration in response to CO2; however, because of the stimulatory effect of CO2 on leaf biomass, the amount of urushiol produced per plant increased significantly for all CO2 above the 300 µmol mol−1 baseline. Significant increases in the rate of leaf development following leaf removal were also observed with increasing CO2. Overall, these data confirm earlier, field-based reports on the CO2 sensitivity of poison ivy but emphasize its ability to respond to even small (∼ 100 µmol mol−1) changes in CO2 above the mid-20th century carbon dioxide baseline and suggest that its rate of spread, its ability to recover from herbivory, and its production of urushiol, may be enhanced in a future, higher CO2 environment.

Keywords

Poison ivy, Toxicodendron radicans, (L.) Kuntze TOXRAClimate changecarbon dioxideleaf developmenttoxicology
Type
Weed Biology and Ecology
Information
Weed Science , Volume 55 , Issue 4 , August 2007 , pp. 288 - 292
Copyright
Copyright © Weed Science Society of America 

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