On the Effects of Weak Auxins and Antiauxins upon Root Growth

ÅBerg, Börje

doi:10.1111/j.1399-3054.1952.tb07719.x

Cited by 32 publications

(3 citation statements)

References 27 publications

(11 reference statements)

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“…Phenoxyacetic acid which possesses but little activity as an auxin has similarly been shown to antagonize the action of more active auxins. Thus ABERG (2) found this compound effective in counteracting inhibition of the growth of flax roots induced by 2,4-dichlorophenoxyacetic acid while AUDUS and SHIPTON (3) have shown that it relieves inhibition of cress root growth that is induced by 2,4-dichlorophenoxyacetic acid.…”

Section: Introductionmentioning

confidence: 99%

“…The way in which two auxins interact within the plant to determine growth rate will be shown in the present paper to be dependent upon the value of the constants, K, and Vmax, for each of the interacting materials. Materials Wre can now describe the initial growtlh rate of the system as a function of auxin concentration by equation 2 and we are now able to determine values for constants Vniax and K", provided that the above assumptions are indeed correct. values relative to naphthalene acetic acid (NAA) wlichl are given in table I have not been included in figure 1 The principles which govern the interaction of two different applied auxins may also be involved in the interaction of an applied exogenous auxin with the native endogenous auxin of the plant.…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of Auxin Interaction

1953

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Kinetics of Auxin Interaction

1953

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“…This change has been studied_ in further detail for the 2,4,5-trichloro-anilino compounds. The acetic acid (2,4, is an intermediate growth regulator, while 2,4,5-ClaPOA is purely auxinic. The substance D( + )2,4,5-ClaPNP shows only auxin ac tivity.…”

Section: Optical Isomerismmentioning

confidence: 99%

Stereoisomerism in Plant Growth Regulators of the Auxin Type

Fredga¹,

ÅBerg²

1965

Annu. Rev. Plant. Physiol.

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The relation between chemical structure and physiological action of the plant growth regulators of auxin type has been the object of extensive studies for three decades. Many interesting hypotheses have been suggested to ex plain the available data, but no simple explanation apt to embrace all groups of active substances has as yet been presented. The problem has been the object of several reviews (e.g., 59, 85, 105, 109, 110). Two main alternatives can be discerned in the current discussion.(a) The auxin molecules become attached to a receptor site, presumably at a protein surface, by several weak bonds (e.g., van der Waals forces, electrostatic attraction, hydrogen bridges) . The bonding is thought to be of the same type as that occurring between enzyme molecules and their sub strates. This "multipoint attachment" concept has been developed mainly by Veldstra. The "three-point attachment" hypothesis of Wain and co-work ers, assuming a bonding by the ring system (or other flat part of the mole cule) , the carboxyl group and an a-hydrogen atom in the proper steric posi tion can be regarded as a variant of the multipoint attachment concept.(b) In sharp opposition to this concept, the "two-point attachment" hypothesis of Hansch and Muir assumes a covalent bonding of the auxin molecul e to a protein receptor. The carboxyl group is thought to form a pep tide bond with the protein, while the SH-group of a cysteinyl unit reacts through a nucleophilic attack at an ortho position of the ring system with elimination of two hydrogen atoms. These reactions can hardly be assumed to proceed spontaneously, and the assumption of enzymatic catalysis would apparently bring this hypothesis in close proximity to the multi-1 The survey of literature pertaining to this review was concluded in June 1964. 2 The following abbreviations will be used: POA (phenoxyacetic acid); POB [a (phenoxy)-n-butyric acid]; POC [a-(phenoxy)-n-caproic acid]; POiB [a-(phenoxy) iSO-butyric acid]; POP [a-(phenoxy)-propionic acid]; POV [a-(phenoxy)-n-valeric acid]; substituents in the phenyl nucleus are indicated by Me (methyl), MeO (meth oxy), and by the chemical halogen symbols. Thus, 2,4-CbPOA [2,4-dichlorophenoxy acetic acid (2,4-D)], and so on. The same system is followed for the substances re lated to phenyl-imino-acetic acid (PNA); phenylacetic acid (PA); 3-indoleacetic acid (IAA); 1-and 2-naphthylacetic acid (1-and 2-NAA); 1-and 2-naphthylmethyl acetic acid (1-and 2-NMA); 3-and 2-thianaphthenylacetic acid (3-and 2-TnA); l and 2-naphthoxyacetic acid (1-and 2-NOA); 1-and 2-naphthylthioacetic acid (l and 2-NSA); and 2-naphthylselenoacetic acid (2-NSeA). 53Annu. Rev. Plant. Physiol. 1965.16:53-72. Downloaded from www.annualreviews.org Access provided by University of Nebraska -Lincoln on 04/05/15. For personal use only.Quick links to online content Further ANNUAL REVIEWS

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Die Bedeutung von Wuchs- und Hemmstoffen im Leben der höheren Pflanze

Fischnich¹

1955

Z. Pflanzenernaehr. Dueng. Bodenk.

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On the Effects of Weak Auxins and Antiauxins upon Root Growth

Cited by 32 publications

References 27 publications

Kinetics of Auxin Interaction

Kinetics of Auxin Interaction

Stereoisomerism in Plant Growth Regulators of the Auxin Type

Die Bedeutung von Wuchs- und Hemmstoffen im Leben der höheren Pflanze

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