Soil transformation of 2(3H)-benzoxazolone of rye into phytotoxic 2-amino-3H-phenoxazin-3-one |
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Authors: | Ronald W Gagliardo William Scott Chilton |
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Affiliation: | (1) Department of Botany, North Carolina State University, Box 7612, 27695-7612 Raleigh, North Carolina |
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Abstract: | Nonsterile soil transforms the rye metabolite 2(3H)-benzoxazolone (BOA) into 2-amino-3H-phenoxazin-3-one, which is an order
of magnitude more toxic to barnyard grass than benzoxazolone. Benzoxazolone was recovered unchanged from sterile soil. However,o-aminophenol is converted to aminophenoxazinone by both sterile and nonsterile soil in the presence of air. Aminophenoxazinone
is probably produced by microbial hydrolysis of benzoxazolone intoo-aminophenol, which is oxidized to aminophenoxazinone in both sterile and nonsterile soil. No 2,2′-oxo-1,1′-azobenzene was
found in any incubations of soil with benzoxazolone,o-aminophenol, oro-azophenol. |
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Keywords: | 2-Amino-3H-phenoxazin-3-one 2(3H)-benzoxazolone BOA o-aminophenol rye Secale cereale soil transformation phytotoxicity allelopathy barnyard grass Echinocloa crus-galli |
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