Absorption, Distribution, and Root Exudation of 2,4,5-T and Picloram by Ash and Maple
Abstract
Liquid scintillation and autoradiography were utilized in conjunction with paper chromatography to study the uptake, distribution, and root exudation of foliarly applied C14-picloram (4-amino-3,5,6-trichloropicolinic acid) and C14-2,4,5-T (2,4,5-trichlorophenoxyacetic acid) in red maple, green ash, and white ash. A leaf-washing technique, which allowed direct counting of the herbicide retained on the surface of the treated leaves, revealed that a greater amount of 2,4,5-T than of picloram was washed off the leaves of all species after 22 days. Autoradiography indicated that 2,4,5-T was distributed throughout ash and ample tissues in greater quantities than picloram and microautoradiography of green ash stem tissue showed possible xylem to phloem exchange. Both picloram and 2,4,5-T were translocated acropetally and basipetally in all species, indicating utilization of both the apoplast and symplast by these two herbicides. Significant root loss of both picloram and 2, 4,5-T was demonstrated in all three species. Greater root loss of both herbicides occurred in red maple than in the two species of ash.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1971
- Accession Number
- AD0720572
Entities
People
- Charles P. Reid
- William A. Wells
- Woodland Hurtt