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Effects of Carbon Dioxide Enrichment on the Expansion and Size of Kudzu (Pueraria lobata) Leaves

Published online by Cambridge University Press:  12 June 2017

Thomas W. Sasek  and
Boyd R. Strain
Thomas W. Sasek
Affiliation:
Duke Phytotron, Dep. Bot., Duke Univ., Durham, NC 27706
Boyd R. Strain
Affiliation:
Duke Phytotron, Dep. Bot., Duke Univ., Durham, NC 27706 Reprint requests to T. Sasek, School of For. and Environ. Studies, Duke Univ., Durham, NC 27706
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Abstract

Seedlings of kudzu were grown at 350, 675, or 1000 μl/L CO2 in controlled-environment chambers. At elevated CO2 concentrations, maximum leaf expansion rates were approximately 40% greater, leaves were fully expanded several days sooner, fully expanded leaves were larger at each leaf position, and leaf production rates were increased 12%. Peak starch accumulation was much greater in plants grown at elevated CO2 concentrations. Total xylem water potentials were higher (less negative) at full hydration, and osmotic potentials were decreased (more negative) by CO2 enrichment. At 1000 μl/L CO2, leaf turgor pressure was twice that at 350 μl/L CO2. Results suggest that leaf expansion rates and leaf expansivity may have been increased due to higher turgor pressure at the higher CO2 concentrations. The potential for successful seedling establishment may be enhanced as the atmospheric CO2 concentration continues to rise, increasing kudzu invasiveness.

Keywords

KudzuPueraria lobata (Willd.) Ohwi # PUELOVinesleaf productionturgor pressurePUELO
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 37 , Issue 1 , January 1989 , pp. 23 - 28
Copyright
Copyright © 1989 by the Weed Science Society of America 

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