The Hydrolysis of 2,4-D Esters by Bean and Corn Plants

Szabo, Steve S.

doi:10.2307/4040535

Cited by 15 publications

(9 citation statements)

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“…If ester hydrolysis is complete or nearly so, a point still in doubt (Szabo, 1963),. then translocation of the herbicide would be in the form of the acid as proposed by Crafts (1960).…”

Section: Translocationmentioning

confidence: 99%

The Absorption and Translocation Characteristics of Several Phenoxyalkyl Acid Herbicides in Bigleaf Maple*

Norris

Freed

1966

Weed Research

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Summary. Studies of the influence of formulation, degree of chlorination of the benzene ring and structure of the side chain of some phenoxyalkyl acid herbicides on absorption and translocation were made in a woody plant, Acer macrophyllum Pursh. In an experiment in which the leaves were treated with 2,4‐D or 2,4,5‐T as the acid, triethanolamine salt or 2‐ethylhexyl ester formulations, it was found that absorption increased with decreasing polarity of the molecule. The lower relative mobility of the ester formulations was offset by their greater absorption which resulted in greater accumulation in the roots when compared with the other herbicides. In treatments where dichlorprop or fenoprop formulated as the 2‐ethylhexyl esters were applied, a definite effect of chemical structure was observed on both absorption and translocation. The results of these tests and their implications in the response of big leaf maple are discussed. Caractères de l'absorption et de la migration de quelques herbicides du groupe des acides phénoxyalkyles dans l'érable a grandes feuilles Acer macrophyllum Pursh.

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“…If ester hydrolysis is complete or nearly so, a point still in doubt (Szabo, 1963),. then translocation of the herbicide would be in the form of the acid as proposed by Crafts (1960).…”

Section: Translocationmentioning

confidence: 99%

The Absorption and Translocation Characteristics of Several Phenoxyalkyl Acid Herbicides in Bigleaf Maple*

Norris

Freed

1966

Weed Research

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“…The theories for the mode of action of benzoic acid-type growth regulators containing carboxyl groups propose a binding of the carboxyl group to an active site (Muir and Hansch, 1951). Studies with radioactive-labelled 2,4-dichloro-phenoxyacetic acid esters (Crafts, 1960;Szabo, 1963) have shown that the compounds are hydrolyzed in the plant, and only the acid is translocated. Similar esterase activity should result in the cleavage of the 2,3-DCBA esters.…”

Section: Resultsmentioning

confidence: 99%

Effects of Ester Chain Lengths on the Growth Regulating Activity of 2,3‐dichlorobenzoates

Steffens

Buta

1970

American J of Botany

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A B S T RAe TThe activities of the n-C 1 through n-CIO esters of 2,3-dichlorobenzoic acid (DCBA) were tested as inhibitors of terminal growth of Xanthi-ne tobacco plants. The C2 and C3 esters were the most active as emulsions at 2.5 X IO-2M. They retarded growth of the entire bud for 10 days and longer upon repeated applications. Treatment of plants with 2,3-DCBA or its potassium salt at dosages up to 5 X 1O-2 M caused only slight growth regulating effects. In a dosage-response study, it was clearly shown that the C 3 ester inhibited stem elongation but the C 8 ester did not. The striking differences in plant growth due to treatment with 2,3-DCBA esters of different alkyl chain lengths are discussed in terms of penetration, ester hydrolysis, and growth factor interactions.

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“…CRAFTS (1961) has obtained evidence that short chain esters of 2,4-D may hydrolyze during foliar penetration, thus liberating the 2,4-D ion for movement via an aqueous route to the symplast. SZABO (1963) additionally demonstrated that both the butoxyethanol and the propyleneglycol ether esters of 2,4-D are hydrolyzed on the leaf surface of bean and maize plants, as well as within the plant itself. It thus appears that the cuticular wax, or some constituent( s) thereof, provides a microchemical environment capable of causing solubilization, hydrolysis, and possibly other reactions, even before the penetrant has reached the cutin.…”

Section: Prefacementioning

confidence: 94%

Residue Reviews / Rückstands-Berichte

1970

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The Hydrolysis of 2,4-D Esters by Bean and Corn Plants

Cited by 15 publications

References 0 publications

The Absorption and Translocation Characteristics of Several Phenoxyalkyl Acid Herbicides in Bigleaf Maple*

The Absorption and Translocation Characteristics of Several Phenoxyalkyl Acid Herbicides in Bigleaf Maple*

Effects of Ester Chain Lengths on the Growth Regulating Activity of 2,3‐dichlorobenzoates

Residue Reviews / Rückstands-Berichte

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