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Responses of Soybean (Glycine max) and Three C4 Grass Weeds to CO2 Enrichment During Drought

Published online by Cambridge University Press:  12 June 2017

David T. Patterson
David T. Patterson*
Affiliation:
U.S. Dep. Agric., Dep. Bot., Duke Univ., Durham, NC 27706
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Abstract

In controlled-environment chambers at 29/33 C day/night and 1000 μE·m-2·s-1 photosynthetic photon flux density (PPFD), increasing the CO2 concentration from 350 to 675 ppm (v/v) did not affect leaf area or total dry weight of well-watered plants of barnyardgrass [Echinochloa crus-galli (L.) Beauv. # ECHCG], goosegrass [Eleusine indica (L.) Gaertn. # ELEIN], or southern crabgrass [Digitaria ciliaris (Retz.) Koel. # DIGSP] after 30 days. However, the whole plant transpiration rate per unit leaf area decreased, and the water use efficiency increased, in response to CO2 enrichment. In a subsequent experiment, with water availability limited by an imposed drought, CO2 enrichment reduced the effects of water stress and significantly increased leaf area and total dry weight of the three C4 grasses and soybean [Glycine max (L.) Merr. ‘Ransom’]. Growth enhancement in response to CO2 enrichment was greater in soybean than in the C4 grasses. By improving their water economy, CO2 enrichment can increase the growth of both C3 and C4 plants under water stress. However, growth stimulation can be expected to be greater in C3 plants.

Keywords

Water stressECHCGELEINDIGSP
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 34 , Issue 2 , March 1986 , pp. 203 - 210
Copyright
Copyright © 1986 by the Weed Science Society of America 

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References

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