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Root Absorption and Translocation of Picloram by Oats and Soybeans

Published online by Cambridge University Press:  12 June 2017

A. R. Isensee ,
G. E. Jones  and
B. C. Turner
A. R. Isensee
Affiliation:
Plant Sci. Res. Div., Agr. Res. Serv., U.S. Dep. of Agr., Beltsville, Maryland 20705
G. E. Jones
Affiliation:
Plant Sci. Res. Div., Agr. Res. Serv., U.S. Dep. of Agr., Beltsville, Maryland 20705
B. C. Turner
Affiliation:
Soil and Water Conserv. Serv., U.S. Dep. of Agr., Beltsville, Maryland 20705
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Abstract

The effects of time, concentration, pH, temperature, and metabolic inhibitors on 4-amino-3,5,6-trichloropicolinic acid (picloram) uptake from nutrient solution by oats (Avena sativa L. ‘Markton’) and soybeans (Glycine max L. ‘Lee’) were studied. Oats and soybeans had similar absorption patterns of rapid initial uptake. However, total accumulation patterns markedly differed in that accumulation was concentration-dependent for oats but not for soybeans. Initial uptake by oats and soybean roots increased as solution concentration increased. Picloram was redistributed in oats and soybeans and some egress from roots to solution occurred. Picloram uptake by both plant species was markedly diminished with an increase in pH from 3.5 to 4.5, but pH had little effect from 4.5 to 9.5. Less picloram was taken up by oats and soybean roots from solution maintained at 4 C than at 26 C. Translocation to tops followed a similar trend. Increasing concentrations of three metabolic inhibitors, 2,4-dinitrophenol (DNP), sodium azide, and sodium arsenite, reduced root uptake of picloram in both species. All inhibitors (except DNP for oats) at 10−6 to 10−5 molar concentrations stimulated translocation of picloram to oats and soybean tops while higher concentrations depressed translocation.

Type
Research Article
Information
Weed Science , Volume 19 , Issue 6 , November 1971 , pp. 727 - 731
Copyright
Copyright © Weed Science Society of America 

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