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Growth Responses in Sorghum and Wheat Induced by Glyphosate

Published online by Cambridge University Press:  12 June 2017

J.R. Baur ,
R.W. Bovey  and
J.A. Veech
J.R. Baur
Affiliation:
U.S. Dep. of Agric., Agric. Res. Serv., College Station, TX 77843
R.W. Bovey
Affiliation:
U.S. Dep. of Agric., Agric. Res. Serv., College Station, TX 77843
J.A. Veech
Affiliation:
U.S. Dep. of Agric., Agric. Res. Serv., College Station, TX 77843
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Abstract

Foliar application of 2.8 μg/plant of glyphosate [N-(phosphonomethyl)glycine] to greenhouse grown sorghum [Sorghum bicolor (L.) Moench ‘Tophand’] seedlings resulted in increased fresh weight. As glyphosate levels were increased to 11.2 μg/plant, diameter of the basal growth zone increased while fresh weight decreased. In growth chamber studies with sorghum and wheat [Triticum aestivum (L.) ‘Era’] seedlings, glyphosate caused the greatest reduction in fresh weight at the optimum growth temperatures for both species. Glyphosate inhibited normal production of basal buds in wheat at the optimum growth temperature and stimulated bud production at temperatures above the optimum. Under normal growth conditions, basal buds in sorghum do not develop; however, application of glyphosate stimulated basal bud development under normal and above-normal temperature conditions. Histochemical analysis of malate dehydrogenase activity in apical meristem tissue of treated sorghum seedlings indicated that growth of the apex was normal and viable.

Type
Research Article
Information
Weed Science , Volume 25 , Issue 3 , May 1977 , pp. 238 - 240
Copyright
Copyright © 1977 by the Weed Science Society of America 

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References

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