Atrazine metabolism in resistant corn and sorghum

Shimabukuro, R.H. (1968) Atrazine metabolism in resistant corn and sorghum. Plant Physiology, 43 (12). pp. 1925-1930.

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The metabolism of 2-chloro-4-ethylamino-6-isopropylamino-s-triazine (atrazine)in the resistant species, corn (Zea inays L.) and scrghum (Sorghum vulgare Pers.) was not the same. In corn, atrazine was metabolized via both the 2-hydroxylation and N-dealkylation pathways while sorghum metabolized atrazine zvia the N.dealkylation pathway. Atrazine metabolism in corn yielded the metabolites, 2-hydroxy-4-ethylamino-6-isopropylamino-s-triazine (hydroxyatrazine), 2-hydroxy-4-amino-6-isopropylamino-s-triazine (hydroxycompound I), and 2-hydroxy-4-amino-6-ethylamino-s-triazine (hydroxycompound II). None of these hydroxylated derivatives appeared as metabolites of atrazine in sorghum.Hydroxycompounds I and II were formed in 2 ways in corn: (1) by benzoxazinone-catalyzed hydrolysis oif 2-chloro-4-amino-6-isopropylamino-s-triazine (compound I) and 2-chloro.4-aminc-6-ethylamino-s-triazine (compound II) that were formed by N.deadkylation of atrazine and (2) by N-dealkylation of hydroxyatrazine, the major atrazine metabolite in corn. The interaction of the 2-hydroxylation and N-detilkylation pathways in corn results in the formation of the 3 hydroxylated non-phytotoxic derivatives of atrazine.

Item Type: Article
Author Affiliation: Agricultural Research Service, United States Department of Agriculture, Fargo, North Dakota 58102
Subjects: Plant Physiology and Biochemistry > Plant Physiology
Divisions: Maize
Depositing User: Sandhya Gir
Date Deposited: 09 Nov 2010 18:02
Last Modified: 29 Dec 2010 20:40
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