Imazaquin absorption, translocation, and metabolism in flue-cured tobacco

• Published in: Weed technology 1993-04, Vol.7 (2), p.370-375
• Main Authors: Walls, F.R. Jr, Corbin, F.T, Collins, W.K, Worsham, A.D, Bradley, J.R. Jr
• Format: Article
• Language: English
• Subjects: ABSORCION; ABSORPTION; APLICACION FOLIAR; APPLICATION FOLIAIRE; CAROLINA DEL NORTE; CAROLINE DU NORD; CHEMICAL CONTROL; CHEMICAL RESISTANCE; CONTROL QUIMICO; DESHERBAGE; ESCARDA; FEUILLE; FISIOLOGIA VEGETAL; FITOTOXICIDAD; FOLIAR APPLICATION; FOTOSINTESIS; HERBICIDAS; HERBICIDE; HERBICIDES; HOJAS; LEAVES; LUTTE CHIMIQUE; METABOLISM; METABOLISME; METABOLISMO; NICOTIANA TABACUM; NORTH CAROLINA; PHOTOSYNTHESE; PHOTOSYNTHESIS; PHYSIOLOGIE VEGETALE; PHYTOTOXICITE; PHYTOTOXICITY; Plant anatomy; PLANT PHYSIOLOGY; Plant roots; Plants; PLANTULAS; PLANTULE; RACINE; Radiocarbon; RAICES; RESISTANCE AUX PRODUITS CHIMIQUES; RESISTENCIA QUIMICA; ROOTS; SEEDLINGS; SHOOTS; SOIL TREATMENT; SOURCE SINK RELATIONS; Soybeans; STEMS; TALLO; TIGE; Tobacco; TRAITEMENT DU SOL; TRATAMIENTO DEL SUELO; WEED CONTROL
• ISSN: 0890-037X; 1550-2740
• DOI: 10.1017/S0890037X00027755

Absorption of^{14}{\rm C}\text{-imazaquin}$by leaves of field-grown flue-cured tobacco was similar when applied to young seedlings immediately after transplanting or to plants 3 wk after transplanting. The distribution of14C in treated leaves indicated that 40% was absorbed, 54% remained in water extracts of leaf surfaces, and 6% was found in the epicuticular wax layer 8 d after treatment. Translocation of the herbicide from treated leaves to roots was very low (4 to 5%). In contrast, soil applications of imazaquin and subsequent uptake by roots resulted in retention of 40 to 53% in roots and translocation of 47 to 60% to shoots after 8 d. Analyses of methanol-soluble extracts of14C indicated that more than 77% of the foliar-applied herbicide was metabolized in roots and upper shoots after 2 d. Similarly, 64% or more of the imazaquin was degraded in roots and shoots 2 d after root absorption.