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Differential Gas Exchange Responses of Two Biotypes of Redroot Pigweed to Atrazine

Published online by Cambridge University Press:  12 June 2017

L. D. West ,
T. J. Muzik  and
R. E. Witters
L. D. West
Affiliation:
Washington State Univ. Amchem Products, Ambler, PA 19002
T. J. Muzik
Affiliation:
Dep. Agron. and Soils, Washington State University, Pullman, WA 99163
R. E. Witters
Affiliation:
Dep. Agron. and Soils, Washington State University, Pullman, WA 99163
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Abstract

Differences were shown to exist in photosynthetic rate, transpiration rate, and carbon dioxide leaf diffusive resistance between atrazine [2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine] susceptible (S) and resistant (R) plants of redroot pigweed (Amaranthus retroflexus L.). Chlorbromuron [3-(4-bromo-3-chlorophenyl)-1-methoxy-1-methylurea] and diruon [3-(3,4-dichlorophenyl)-1,1-dimethylurea] were the only herbicides tested that controlled both biotypes, but all of the herbicides except norea [3-(hexahydro-4,7-methanoindan-5-yl)-1,1-dimethylurea] controlled the S biotype. Although photosynthetic activity and transpiration were reduced in both biotypes by atrazine at 50 and 70 ppm, the decline was much greater in the S biotype than in the R biotype and persisted a longer time in the S biotype. Leaf CO2 diffusive resistances of the biotypes were increased by atrazine applications. Mesophyll resistance was increased to a greater extent than stomatal resistance suggesting that reduction of photosynthesis is due to a greater effect of atrazine on the mesophyll tissue than on the guard cells.

Type
Research Article
Information
Weed Science , Volume 24 , Issue 1 , January 1976 , pp. 68 - 72
Copyright
Copyright © 1976 by the Weed Science Society of America 

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References

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