Journal Article

Short‐term exposure to elevated atmospheric CO<sub>2</sub> benefits the growth of a facultative annual root hemiparasite, <i>Rhinanthus minor</i> (L.), more than that of its host, <i>Poa pratensis</i> (L.)

Jun‐Kwon Hwangbo, Wendy E. Seel and Sarah J. Woodin

in Journal of Experimental Botany

Published on behalf of Society for Experimental Biology

Volume 54, issue 389, pages 1951-1955
Published in print August 2003 | ISSN: 0022-0957
Published online August 2003 | e-ISSN: 1460-2431 | DOI:
Short‐term exposure to elevated atmospheric CO2 benefits the growth of a facultative annual root hemiparasite, Rhinanthus minor (L.), more than that of its host, Poa pratensis (L.)

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The effects of elevated CO2 (650 ppm) on interactions between a chlorophyllous parasitic angiosperm, Rhinanthus minor (L.) and a host, Poa pratensis (L.) were investigated. R. minor benefited from elevated CO2, with both photosynthesis and biomass increasing, and transpiration and tissue N concentration remaining unaffected. However, this did not alleviate the negative effect of the parasite on the host; R. minor reduced host photosynthesis, transpiration, leaf area and biomass, irrespective of CO2 concentration. Elevated CO2 resulted in increased host photosynthesis, but there was no concomitant increase in biomass and foliar N decreased. It appears that the parasite may reduce host growth more by competition for nitrogen than for carbon. Contrary to expectation, R. minor did not reduce the productivity of the host–parasite association, and it actually contributed to the stimulation of productivity of the association by elevated CO2.

Keywords: Key words: Elevated CO2, nitrogen, parasitic angiosperm, photosynthesis, Poa pratensis, Rhinanthus minor.

Journal Article.  3306 words. 

Subjects: Plant Sciences and Forestry

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