Transport and Other Modes of Movement of Hormones (Mainly Auxins)

Kaldewey, Harald

doi:10.1007/978-3-642-67731-1_4

Cited by 36 publications

(23 citation statements)

References 424 publications

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“…Suttle (1991) has demonstrated for sunflower hypocotyls that this decrease in auxin polar transport is due to a loss of function of the IAA efflux carrier with increased age. As discussed by Kaldeway (1984) and Sánchez-Bravo et al (1992), the existence of a decrease in basipetal IAA transport might produce the so-called barrier effect. This would imply that if the amount of IAA to be transported from the apical part of the hypocotyl to its base were higher than the capacity to transport IAA, IAA would accumulate in the lower regions of the hypocotyl, where it would exert its effects.…”

Section: Linkage Analysismentioning

confidence: 99%

Superroot, a recessive mutation in Arabidopsis, confers auxin overproduction.

et al. 1995

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We have isolated seven allelic recessive Arabidopsis mutants, designated superroot (surl-7 to surl-7), displaying several abnormalities reminiscent of auxin effects. These characteristics include small and epinastic cotyledons, an elongated hypocotyl in which the connection between the stele and cortical and epidermal cells disintegrates, the development of excess adventitious and lateral roots, a reduced number of leaves, and the absence of an inflorescence. When germinated in the dark, surl mutants did not develop the apical hook characteristic of etiolated seedlings. We were able to phenocopy the Surl-phenotype by supplying auxin to wild-type seedlings, to propagate surl explants on phytohormonedeficient medium, and to regenerate shoots from these explants by the addition of cytokinins alone to the culture medium. Analysis by gas chromatography coupled to mass spectrometry indicated increased levels of both free and conjugated indole-3-acetic acid. surl was crossed to the mutant axr2 and the altered-auxin response mutant ctrl. The phenotype of both double mutants was additive. The surl gene was mapped on chromosome 2 at 0.5 centimorgans from the gene encoding phytochrome B.

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Section: Linkage Analysismentioning

confidence: 99%

Superroot, a recessive mutation in Arabidopsis, confers auxin overproduction.

et al. 1995

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“…IAA, ABA, GAs, and CKs have been detected in the phloem and xylem saps of many tree species (Table 1 ; 82,215), and radial transport across the cambial region between the xylem and phloem has been observed for 14 C-IAA in Salix viminalis L . (56,100), Salix fragilis L .…”

Section: Identification Source Metabolism and Transport Of Endogmentioning

confidence: 99%

7. The role of plant growth regulators in forest tree cambial growth

1987

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“…Auxin is known to be transported actively in a polar manner through shoot and root tissue of young plants (for a review see Kaldewey 1984). The process has been described as a transfer from cell to cell across the plasma membranes and intervening free space (Cande and Ray 1976).…”

Section: Introductionmentioning

confidence: 99%

Phytotropin-binding sites and auxin transport in Cucurbita pepo: evidence for two recognition sites

Michalke

Katekar

Geissler

1992

Planta

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Two properties of phytotropins, their ability to bind to 1-N-naphthylphthalamic acid (NPA) receptors located on microsomal vesicles isolated from Cucurbita pepo L. hypocotyls, and to stimulate auxin (indol-3-yl acetic acid, IAA) accumulation into such vesicles by blocking its efflux from them, were assessed in double labelling experiments using [2,3,4,5-(3)H]1-N-naphthylphthalamic acid and 3-indolyl-[2-(14)C]acetic acid. Two sites of differing affinities and activities on IAA accumulation were found. 1-N-Naphthylphthalamic acid was found to have high affinity (KD at 10(-8)mol·l(-1)) for one site and low affinity (KD at 10(-6) mol·l(-1)) for the other, whereas 2-(1-pyrenoyl)benzoic acid displaced NPA with high efficiency (KD below 10(-8) mol·l(-1)) from both sites. Other phytotropins had intermediate affinities for either site. Occupation of the site with low affinity for NPA stimulated auxin accumulation, while occupation of the high-affinity site with a phytotropin did not interfere with auxin accumulation into vesicles.

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Transport and Other Modes of Movement of Hormones (Mainly Auxins)

Cited by 36 publications

References 424 publications

Superroot, a recessive mutation in Arabidopsis, confers auxin overproduction.

Superroot, a recessive mutation in Arabidopsis, confers auxin overproduction.

7. The role of plant growth regulators in forest tree cambial growth

Phytotropin-binding sites and auxin transport in Cucurbita pepo: evidence for two recognition sites

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