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

Author:

Sung Shi-Jean Susana,South David B.,Gjerstad Dean H.

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 × 10-6M, inhibited photosynthesis, while 1.0 × 10-8M and 1.0 × 10-7M concentrations increased photosynthesis. Metabolite B at 1.0 × 10-4M also inhibited photosynthesis. Metabolites A, C, D, and E did not affect photosynthesis at 1.0 × 10-4in pine needle segments. The bioassay proved simple and useful for determining effects of certain herbicides and metabolites on photosynthesis.

Publisher

Cambridge University Press (CUP)

Subject

Plant Science,Agronomy and Crop Science

Reference16 articles.

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2. “Velpar”, a new non-selective herbicide from DuPont;Hernandez;Proc. South. Weed Sci. Soc.,1975

3. A new method for detecting photosynthesis inhibitors;Truelove;Weed Sci.,1974

4. Absorption and translocation of hexazinone and tebuthiuron in winged elm;McNeil;Proc. South. Weed Sci. Soc.,1980

5. Herbaceous weed control results in pine seedlings;Fitzgerald;Weed Sci.,1979

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