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The Mode of Action of Simazine in Barley

Published online by Cambridge University Press:  12 June 2017

W. Sherrill Allen  and
Rupert D. Palmer
Rupert D. Palmer
Affiliation:
Plant Pathology and Weed Control, Mississippi Agricultural Experiment Station, Mississippi State University, State College, Mississippi
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Abstract

The toxic effects of 2-chloro-4,6-bis(ethylamino)-s-triazine (simazine) to barley were avoided by feeding plants treated with 1.5 lb/A of simazine, sucrose, glucose, aspartate, and maltose. Shoots from plants fed glucose and maltose contained more soluble carbohydrate than the check. Plants fed glutamine and asparagine were higher in total nitrogen content than the check. Plants fed sucrose and maltose increased their nitrogen content over the check, but plants fed glucose did not. The harmful effects of simazine occurred primarily in barley shoots exposed to light. Plants grown in the dark showed a very small decrease in weight of shoots and soluble carbohydrate content as the level of simazine increased, while the weight of the shoots and soluble carbohydrate content of treated plants grown in the light decreased sharply. Simazine had little effect on root growth of plants grown in the light or dark. The data on root respiration showed that barley roots metabolized the added substances differently and that simazine differentially influenced their metabolism by the roots.

Type
Research Article
Information
Weeds , Volume 11 , Issue 1 , January 1963 , pp. 27 - 31
Copyright
Copyright © 1963 Weed Science Society of America 

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References

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