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Effect of Water Stress on Photosynthetic Parameters of Soybean (Glycine max) and Velvetleaf (Abutilon theophrasti)

Published online by Cambridge University Press:  12 June 2017

Philip H. Munger ,
James M. Chandler  and
J. Tom Cothren
Philip H. Munger
Affiliation:
Soil and Crop Sci. Dep., Texas A&M Univ., College Station, TX 77843
James M. Chandler
Affiliation:
Soil and Crop Sci. Dep., Texas A&M Univ., College Station, TX 77843
J. Tom Cothren
Affiliation:
Soil and Crop Sci. Dep., Texas A&M Univ., College Station, TX 77843
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Abstract

Greenhouse experiments were conducted to elucidate the effects of water stress on photosynthetic parameters of soybean [Glycine max (L.) Merr. ‘Hutton′] and velvetleaf (Abutilon theophrasti Medik. # ABUTH). Stomatal conductance of both species responded curvilinearly to reductions in leaf water potential. At leaf water potentials less negative than −2.5 MPa, stomatal conductance, net photosynthetic rate, and transpiration rate were greater in velvetleaf than in soybean. Soybean photosynthetic rate was linearly related to stomatal conductance. Velvetleaf photosynthetic rate increased linearly with stomatal conductances up to 1.5 cm s–1; however, no increase in photosynthetic rate was observed at stomatal conductances greater than 1.5 cm s–1, indicating nonstomatal limitations to photosynthesis. As water stress intensified, stomatal conductance, photosynthetic rate, and transpiration of velvetleaf declined more rapidly than in soybean.

Keywords

Stomatal conductancecompetitiontranspirationABUTH
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 35 , Issue 1 , January 1987 , pp. 15 - 21
Copyright
Copyright © 1987 by the Weed Science Society of America 

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