Transport 2,4-dichlorophenoxyacetate

Estrella MR, ML Brusseau, RS Maier, IL Pepper, PJ Wierenga, RM Miller (1993) Biodegradation, sorption, and transport of 2,4-dichlorophenoxyacetic acid in saturated and unsaturated soils. Appl Environ Microbiol 59 4266-4273. 

There is qualified support for the weak-acid hypothesis, particularly for compounds such as 2,4-dichlorophenoxyacetic acid. Crisp and Look (.5) compared the phloem mobility of several synthetic 4-chlorophenoxy derivatives. The carboxyl derivative was loaded and transported in the phloem, whereas derivatives in which the COOH group was replaced by an ethyl ester, amide, ketone, alcohol, or amino group were not translocated. 

Pesticides may be tracked into the indoor environment after a certain outdoor apphcation [18, 19] or through transport from the workplace to the home (para-occupational or take-home exposure). Collection of floor dust both prior to and after lawn-apphed 2,4-dichlorophenoxyacetic acid (2,4-D), indicated that turf residues are transported indoors [20]. Carpet dust levels of 2,4-D and dicamba and carpet surface dislodgeable residue levels were highly correlated with turf dislodgeable residue levels [21]. 

In summary, purines, kinetin and its artificial analogues, benzimidazole, indoleacetic acid, triiodobenzoic acid, 2,4-dichlorophenoxyacetic acid and a hypothetical root substance show ceitain common effects. However, they do not manifest themselves in all the investigated materials in the same way, possibly because some are quickly decomposed or translocated. One of the most general effects is the retardation of yellowing of excised leaves or leaf parts. For some of these substances, especially kinetin, other effects have been observed, but it is not known whether they are characteristic for the other substances. Among these effects are active transport, accumulation... 

Abrol BK, Audus LJ (1973) The lateral transport of 2,4-dichlorophenoxyacetic acid in horizontal hypocotyl segments of Helianthus annuus. J Exp Bot 24 1209-1223... 

McCready CC (1963) Movement of growth regulators in plants. I. Polar transport of 2,4-dichlorophenoxyacetic acid in segments from petioles of Phaseolus vulgaris. New Phytol 62 3-18... 

McCready CC, Jacobs WP (1963 a) Movement of growth regulators in plants. II. Polar transport of radioactivity from indoleacetic acid- C and 2,4-dichlorophenoxyacetic acid- C in petioles of Phaseolus vulgaris. New Phytol 62 19-34 McCready CC, Jacobs WP (1963 b) Movement of growth regulators in plants. IV. Relationship between age, growth, and polar transport in petioles of Phaseolus vulgaris. New Phytol 62 360-366... 

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