Differential Metabolism of Metribuzin by Downy Brome (Bromus tectorum) and Winter Wheat (Triticum aestivum)

At both 15 and 25 C, following a 24-h root absorption period, absorbed 14C-metribuzin [4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one] was metabolized approximately 30% more rapidly to water-soluble and terminal fiber metabolites by winter wheat (Triticum aestivum L.) than by d...

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Bibliographic Details
Published in:Weed science 1987-11, Vol.35 (6), p.741-745
Main Authors: Devlin, Daniel L., Gealy, David R., Morrow, Larry A.
Format: Article
Language:English
Subjects:
ABSORCION
ABSORPTION
Barley
BROMUS TECTORUM
ESTADOS UNIDOS DE AMERICA
ETATS-UNIS
FITOTOXICIDAD
HERBICIDAS
HERBICIDE
HERBICIDES
Leaf blade
Leaf sheaths
Leaves
METABOLISM
METABOLISME
METABOLISMO
Nutrient solutions
Physiology, Chemistry, and Biochemistry
PHYTOTOXICITE
PHYTOTOXICITY
Plant roots
Plants
Radiocarbon
Soybeans
TRANSLOCACION
TRANSLOCATION
TRITICUM AESTIVUM
USA
WASHINGTON
Wheat
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Summary:At both 15 and 25 C, following a 24-h root absorption period, absorbed 14C-metribuzin [4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one] was metabolized approximately 30% more rapidly to water-soluble and terminal fiber metabolites by winter wheat (Triticum aestivum L.) than by downy brome (Bromus tectorum L. # BROTE). Both species metabolized a greater proportion of metribuzin in leaf sheaths and roots than in the leaf blades. This was attributed to the increased incorporation of metribuzin into fiber. After an initial leaf extraction, metribuzin and the metabolites deaminated metribuzin (DA), deaminated diketo metribuzin (DADK), and diketo metribuzin (DK) partitioned into a chloroform fraction and five unidentified water-soluble metabolites into an aqueous fraction. At both 15 and 25 C, downy brome absorbed approximately three times more metribuzin per fresh weight than did winter wheat. The mechanism of differential tolerance of downy brome and winter wheat to metribuzin was attributed to the ability of winter wheat to metabolize metribuzin more rapidly and absorb less metribuzin than downy brome.
ISSN:0043-1745
1550-2759
DOI:10.1017/S004317450007925X