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Effects of Glyphosate on Transpiration

Published online by Cambridge University Press:  12 June 2017

D. L. Shaner
D. L. Shaner*
Affiliation:
Dep. of Plant Sci., Univ. of California, Riverside, CA 92521
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Abstract

Applications of glyphosate [N-(phosphonomethyl)glycine] to the leaves of pea (Pisum sativum L. ‘Burpee's Blue Bantam’), sunflower (Helianthus annuus L. ‘Mammoth’), and bean (Phaseolus vulgaris L. ‘Red Kidney’) reduced transpiration in all three species. The reduction varied with species and concentration applied. Eight-day-old bean leaves responded earlier than leaves on older plants. However, after 29 h, there was no difference in transpiration rates with seedling age, since treated leaves on both ages investigated were transpiring at about one-half the rate of control leaves. Addition of surfactant to the solution shortened the time interval between treatment and transpirational response but did not affect the final transpiration rate as compared to glyphosate without surfactant. The effect of glyphosate on transpiration was not due to changes in water availability or to the surface of the leaf that was treated. It is suggested that these results can give some insight into uptake, translocation, and mode of action of glyphosate.

Keywords

Abscisic acidPhaseolus vulgarisPisum sativumHelianthus annuus
Type
Research Article
Information
Weed Science , Volume 26 , Issue 5 , September 1978 , pp. 513 - 516
Copyright
Copyright © 1978 by the Weed Science Society of America 

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References

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