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Bioassay Indicates a Metabolite of Hexazinone Affects Photosynthesis of Loblolly Pine (Pinus taeda)

Published online by Cambridge University Press:  12 June 2017

Shi-Jean Susana Sung ,
David B. South  and
Dean H. Gjerstad
Shi-Jean Susana Sung
Affiliation:
Weed Sci. Res. Lab., USDA-ARS, Frederick, MD 21701
David B. South
Affiliation:
School of Forestry, Auburn Univ., AL 36849
Dean H. Gjerstad
Affiliation:
School of Forestry, Auburn Univ., AL 36849
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Abstract

The effects of hexazinone [3-cyclohexyl-6-(dimethylamino)-1-methyl-1,3,5-triazine-2,4 (1H, 3H)-dione] and its metabolites, A [3-(4-hydroxycyclohexyl)-6-(dimethylamino)-1-methyl-1,3,5-triazine-2,4 (1H,3H)-dione], B [3-cyclohexyl-6-(methylamino)-1-methyl-1,3,5-triazine-2,4 (1H,3H)-dione], C [3-(4-hydroxycyclohexyl)-6-(methylamino)-1-methyl-1,3,5-triazine-2,4 (1H,3H)-dione], D [3-cyclohexyl-1-methyl-1,3,5-triazine-2,4,6 (1H, 3H,5H)-trione], and E [3-(4-hydroxycy clohexyl)-1-methyl-1,3,5-triazine-2,4,6 (1H,3H,5H)-trione], on photosynthesis of loblolly pine primary needle segments were studied using a bioassay technique. Hexazinone, at concentrations equal to or greater than 1.0 × 10-6 M, inhibited photosynthesis, while 1.0 × 10-8 M and 1.0 × 10-7 M concentrations increased photosynthesis. Metabolite B at 1.0 × 10-4 M also inhibited photosynthesis. Metabolites A, C, D, and E did not affect photosynthesis at 1.0 × 10-4 in pine needle segments. The bioassay proved simple and useful for determining effects of certain herbicides and metabolites on photosynthesis.

Keywords

Herbicidal actionphytotoxicityneedle stage of pine
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 33 , Issue 4 , July 1985 , pp. 440 - 442
Copyright
Copyright © 1985 by the Weed Science Society of America 

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References

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