Auxin Activity of Some Indole Derivatives.

Thimann, Kenneth V.

doi:10.1104/pp.33.5.311

Cited by 48 publications

(10 citation statements)

References 23 publications

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“…Skatole also did not show synergistic activi-(significant at the 5 % level) with 20 mm slit sections ty. The latter is at variance with the data of Thimann (table IV); and it was reported by Osborne (10) to (14).…”

Section: Resultscontrasting

confidence: 56%

“…He considered this suggestive that sparing of IAA from IAA oxidase was involved and presented evidence that at high concentrations of IAA indlole inhibits the oxidase. The physiological significance of the latter already has been questioned (9) on the basis that at the lowest concentration of IAA tested, 6 X 10-4 At Went (19); and skatole, which Thimann (14) reported to have some synergistic activity witlh TAA in the pea curvature test.…”

Section: Department Of Botany University Of Georgia Athensmentioning

confidence: 99%

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Further studies of synergism in slit pea test

Michel¹

1961

Plant Physiol.

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The wvork reported in this paper, which is a continuation of that presented earlier (9), had two primary objectives. The first was to determine whether or not sparing of IAA3 by IAN from IAA oxidase could be involved in IAN-IAA synergism in the slit pea test. The second was to determine more completely the kind and extent of growth occurring.If IAA oxidase were of major importance in the interaction of IAN-IAA, no synergism should be expected with either NAA or 2,4-D, which presumably are not attacked by the oxidase (5,13). Van Raalte (18)

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Section: Resultscontrasting

confidence: 56%

Section: Department Of Botany University Of Georgia Athensmentioning

confidence: 99%

Further studies of synergism in slit pea test

Michel¹

1961

Plant Physiol.

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“…There is a striking discrepancy between our results and the biological activities of auxins. Some of the most retained compounds on the acceptor phase (e.g., 5-OH-IAA) show poor auxin activity in biological tests [29]. It appears that lipophilic auxins are more active than hydrophilic ones in the experiments in vivo [30].…”

Section: Loomentioning

confidence: 99%

Interactions of Indole Derivatives with Immobilized 3,5‐Dinitrobenzoyl‐Phenylglycine

Šoškić

Magnus

2009

QSAR Comb. Sci.

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Relative binding constants for 50 ring-substituted indolic compounds, most of them with auxin activity, to immobilized 3,5-dinitrobenzoyl-phenylglycine were determined by high performance liquid chromatography. To learn more about the recognition mechanism, QSPR (quantitative structure-property relationship) analysis was performed. A fiveparameter model, based on physico-chemical and structural properties, was obtained which accounted for more than 97% of the variations in the relative binding constants. The robustness of the model was confirmed by internal (q 2 LOO ¼ 0.963) and external (q 2 EXT ¼ 0.900) validation. The model suggests that the binding constants of indole derivatives are mainly governed by the electronic and steric properties of the substituents at the indole nucleus. Electron-donating substituents increased affinity, while electronwithdrawing substituents decreased it. Substituents which can form hydrogen-bonds with the acceptor phase further strengthened affinity, while the negative effect of bulky substituents could be ascribed to steric restrictions at the acceptor phase. The relative binding constants of the dihalogenated compounds studied were essentially determined by their substitution patterns.

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“…Although preliminary results indicated that these compounds might, indeed, be inhibitors, further study showed that they actually stimulated growth at certain concentrations (6). After initiating this study, Thimann (8) reported on the auxin activity of AIAA in Avena and Pisum; however, he did not report on the activity of AIPA. Since our results with regard to AIAA were in general agreement with Thimann's, it seemed even more appropriate to investigate the new compound, AIPA, and to extend the findings with AIAA to other plant tissues.…”

mentioning

confidence: 97%