Relative Growth Rates of Bean and Oat Plants Containing Known Amounts of a Labeled Plant-Growth Regulator (2-Iodo
            <sup>131</sup>
            -3-Nitrobenzoic Acid)

Mitchell, John W.; Wood, John; Wolfe, Winthrop C; Irving, George W.

doi:10.1126/science.106.2756.395

Cited by 13 publications

(2 citation statements)

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“…In most instances there is no information at hand to permit a decision as to whether the translocated stimulus is the applied chemical itself, a derivative of the applied compound, or some endogenous hormone, the formation or movement of which has been influenced by the treatment. In a few cases, however, there is rather clear-cut evidence that the applied compound is transported as such (6,8,17) and at present there seems to be no cogent argument to gainsay that this may be universally true.…”

Section: Introductionmentioning

confidence: 99%

Translocation of Exogenous Growth-Regulators in the Bean Seedling

Weintraub

Brown

1950

Plant Physiol.

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Section: Introductionmentioning

confidence: 99%

Translocation of Exogenous Growth-Regulators in the Bean Seedling

Weintraub

Brown

1950

Plant Physiol.

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“…Many compounds have been tested and some have been found active, but their mechanism of action is not understood. Our earlier work (1,2) on the translocation of a radioactive labeled plant-growth regulator, 2-iodo131-3-nitrobenzoic acid, gave very promising results. However since certain of the phenoxyacetic acids are the most powerful regulators discovered to date, an investigation of the mechanism of action of a typical phenoxyacetic acid would contribute much to our knowledge.…”

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confidence: 99%

SYNTHETIC PLANT-GROWTH REGULATORS: I. 2,4-Dichloro-5-iodophenoxyacetic Acid and Derivatives

Wolfe¹,

Wood²,

Klipp³

et al. 1949

J. Org. Chem.

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Plant growth‐regulating and systemic fungicidal activity: The aryloxyalkylcarboxylic acids

Wain

1951

J Sci Food Agric

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INVESTIGATIONS on synthetic plant growth-regulating substances closely followed the discovery by Kogl et aZ.lg that indole-3-acetic acid was markedly active in promoting cell-elongation. Other indole derivatives were studied by Kogl and Kostermans,2O and Hitchcock's ; the work of Zimmerman and Wilcoxon5* revealed activity in I-naphthylacetic and other arylacetic acids, and in 1938 Irvine16 demonstrated that 2-naphthoxyacetic acid was an active growth-substance.The aryloxyalkylcarboxylic acids have since become an important group of plant growthregulating substances and certain of these compounds, e.g. 2 : 4-dichlorophenoxy-, a-methyl-qchlorophenoxy-and 2-naphthoxy-acetic acids, are now being widely used in agriculture and horticulture."? % 38 All such compounds possess the structural requirements for activity put forward by Koepfli, Thimann and Went18 in 1938. Thus they possess (I) a ring system containing at least one double bond (2) a side chain carrying a terminal -COOH group with at least one carbon atom between it and the ring system and (3) a particular steric relationship between ring and side chain. The molecular structure of most synthetic growth-substances conforms to these requirements. Veldstra,s6 however, on the basis of results obtained in polarographic studies, has reduced them to the following: (a) a ring system with a high surfaceactivity (b) a carboxyl group (or its dipole) in a definite spatial position with regard to this ring system. The evidence relating to all these factors has already been reviewed 1, s 6 9 38 and will not be considered again here. I t is important to note, however, that certain substituted benzoic acids have been shown to be effective for promoting cell-elongationsl 48 and for inducing morphogenic effects in In these compounds, the polar -COOH group is presumably in the plane of the ring, though SkoogS1 has suggested that the orientation of this group may be affected by the nuclear substituents. The importance of the configuration of the 4 O O H group in relation to the ring is well shown in cis-and trans-cinnamic and I : 2 : 3 : 4-tetrahydronaphthylideneacetic acids. The -COOH group is well removed from the plane of the ring in the cis forms of both of these compounds and only these forms are physiologically active.89 s8 On these and other considerations Veldstrase has suggested that growth substances exert their physiological activity at the protoplasmic membrane where, following adsorption and orientation at the surface boundary, the compound exerts an effect on membrane permeability and thus regulates transport. Promotion of growth then arises from the resulting increased flow of metabolites. Other workers have suggested that the action of growth substances is essentially chemical44 or that they act as coenzymes in some essential metabolite reaction.22. 261 341 46Now although the aryloxyalkylcarboxylic acids fulfil the requirements of Koepfli et al., not all of them are plant growth-regulating substances ; indeed, many are completely inactive. Thus, other factors must...

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Relative Growth Rates of Bean and Oat Plants Containing Known Amounts of a Labeled Plant-Growth Regulator (2-Iodo ¹³¹ -3-Nitrobenzoic Acid)

Cited by 13 publications

References 2 publications

Translocation of Exogenous Growth-Regulators in the Bean Seedling

Translocation of Exogenous Growth-Regulators in the Bean Seedling

SYNTHETIC PLANT-GROWTH REGULATORS: I. 2,4-Dichloro-5-iodophenoxyacetic Acid and Derivatives

Plant growth‐regulating and systemic fungicidal activity: The aryloxyalkylcarboxylic acids

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Relative Growth Rates of Bean and Oat Plants Containing Known Amounts of a Labeled Plant-Growth Regulator (2-Iodo 131 -3-Nitrobenzoic Acid)

Cited by 13 publications

References 2 publications

Translocation of Exogenous Growth-Regulators in the Bean Seedling

Translocation of Exogenous Growth-Regulators in the Bean Seedling

SYNTHETIC PLANT-GROWTH REGULATORS: I. 2,4-Dichloro-5-iodophenoxyacetic Acid and Derivatives

Plant growth‐regulating and systemic fungicidal activity: The aryloxyalkylcarboxylic acids

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Relative Growth Rates of Bean and Oat Plants Containing Known Amounts of a Labeled Plant-Growth Regulator (2-Iodo ¹³¹ -3-Nitrobenzoic Acid)