Auxin Transport Characteristics and Cellular Ultrastructure of Different Types of Parenchyma

Wangermann, Elisabeth; Withers, Lyndsey A.

doi:10.1111/j.1469-8137.1978.tb01598.x

Cited by 12 publications

(4 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although experimental data indicate that polar auxin transport in stem is confined to parenchymatous cells associated to the vascular tissues (Morris and Thomas 1978, Gälweiler et al. 1998), it has been shown that basipetal auxin transport does not necessarily depend on the presence of vascular tissues and that it may occur in the stem parenchyma (Van der Weij 1932, Wangermann and Withers 1978) as well as in the epidermis (Jones 1990).…”

Section: Introductionmentioning

confidence: 99%

Origin and basipetal transport of the IAA responsible for rooting of carnation cuttings

Garrido¹,

Guerrero²,

Cano³

et al. 2002

Physiologia Plantarum

View full text Add to dashboard Cite

The origin and transport of the IAA responsible for rooting was studied in carnation (Dianthus caryophyllus L.) cuttings obtained from secondary shoots of the mother plants. The presence of mature leaves in the cuttings was essential for rooting. Removal of the apex and/or the youngest leaves did not reduce the rooting percentage as long as mature leaves remained attached. Removal of mature leaves inhibited rooting for a 24-day period during which the basal leaves grew and reached maturity. After this period rooting progressed as in intact cuttings. Auxin (NAA + IBA) applied to the stem base of defoliated cuttings was about 60% as effective as mature leaves in stimulating rooting. Application of NPA to the basal internode resulted in full inhibition of rooting. The view, deduced from these results, that auxin from mature leaves is the main factor controlling the rooting process was reinforced by the fact that mature leaves contained IAA and exported labelled IAA to the stem. The distribution of radioactivity after application of (5-3H)-IAA to mature leaves showed that auxin movement in the stem was basipetal and sensitive to NPA inhibition. The features of this transport were studied by applying 3H-IAA to the apical cut surface of stem sections excised from cuttings. The intensity of the transport was lower in the oldest node than in the basal internode, probably due to the presence of vascular traces of leaves. Irrespective of the localization of the sections and the carnation cultivar used, basipetal IAA transport was severely reduced when the temperature was lowered from 25 to 4 degrees C. The polar nature of the IAA transport in the sections was confirmed by the inhibition produced by NPA. Local application of IAA to different tissues of the sections revealed that polar auxin transport was associated with the vascular cylinder, the transport in the pith and cortex being low and apolar. The present results strongly support the conclusion that IAA originating from the leaves and transported in the stem through the polar auxin transport pathway was decisive in controlling adventitious rooting.

show abstract

Section: Introductionmentioning

confidence: 99%

Origin and basipetal transport of the IAA responsible for rooting of carnation cuttings

Garrido¹,

Guerrero²,

Cano³

et al. 2002

Physiologia Plantarum

View full text Add to dashboard Cite

show abstract

“…I have used the same value of p everywhere except in row 8, where a small increase was necessary to make the velocities large enough.) The cells that most effectively transport auxin are the extravascular paren chymal cells (Wangermann & Withers 1978), which are quite short compared to epidermal cells, for instance. I take L = 80 pm as a suita The cytoplasm forms a layer 1-2 pm thick in uncentrifuged cells (Goldsmith & Ray 1973).…”

Section: Has Estimated the Permeabilitymentioning

confidence: 99%

The effect of intracellular geometry on auxin transport. I. Centrifugation experiments

1981

Proc. R. Soc. Lond. B.

View full text Add to dashboard Cite

When coleoptiles are centrifuged, the velocity of transport of the plant hormone auxin is dramatically altered. I show here that this may be due to changes in internal cell geometry. The tonoplast, the membrane surrounding the vacuole, may present a substantial permeability barrier for the diffusion of auxin. After centrifugation, the cytoplasm sediments to one end of the cell, displacing the vacuole to the other. If auxin, on entering the cell, must first accumulate in a mass of cytoplasm before crossing the tonoplast, the velocity will be lowered. If, on the other hand, there is only a thin layer of cytoplasm where auxin enters, high concentrations will quickly build up and enable auxin to cross the tonoplast, giving a high velocity. This would explain why centrifugation in a basal direction increases velocity, while apical centrifugation decreases it. If this explanation is correct, and if the tonoplast constitutes an appreciable permeability barrier, then the position of the vacuole may strongly influence the flux of auxin inside a cell. I show in the adjoining paper that this can explain the changed transport pattern seen during the geotropic response.

show abstract

“…Other factors affecting the primary root requirement of maize for lAA were reported to be the lAA gradient from shoot to root (Martin^1978), inhibition of lAA activity by red light (Vanderhoef and Briggs, 1978), and polar transport of lAA in vascular tissue of maize (Wangermann and Withers, 1978). Studies by Patel aT.…”

Section: Indole Acetic Acid In Maizementioning

confidence: 99%

Growth and composition of eucalyptus and maize on Kenya soils fertilized with phosphate and indole acetic acid /

Keter¹

1981

View full text Add to dashboard Cite

Mean analysis of 15to 30-cm depth of Mwea soil sampled after eucalyptus growth treated with indole acetic acid and three concentrated superphosphate sources at three rates Mean height of maize grown on 0to 15-cm depth of undisturbed Athi soil with treatments previously used for eucalyptus Mean height of maize grown on 15to 30-cm depth of undisturbed Athi soil with treatments previously used for eucalyptus Mean height of maize grown on 0to 15-cm depth of undisturbed Mwea soil with treatments previously used for eucalyptus Mean height of maize grown on 15to 30-cm depth of undisturbed Mwea soil with treatments previously used for eucalyptus Mean height of maize grown on 0to 15-cm depth of undisturbed Kabete soil with treatments previously used for eucalyptus Mean height of maize grown on 15to 30-cm depth of undisturbed Kabete soil with treatments previously used for eucalyptus Mean dry matter yield of maize tops grown on Kenya soils undisturbed after treatments previously used for eucalyptus Mean analysis of maize tops sampled from 0to 15-cm depth of undisturbed Athi soil with treatments previously used for eucalyptus Mean analysis of maize tops sampled from 15to 30-cm depth of undisturbed Athi soil with treatments previously used for eucalyptus Mean analysis of maize tops sampled from 0to 15-cm depth of undisturbed Mwea soil with treatments previously used for eucalyptus Mean analysis of maize tops sampled from 15to 30-cm depth of undisturbed Mwea soil with treatments previously ysed for eucalyptus xi 87

show abstract

Auxin Transport Characteristics and Cellular Ultrastructure of Different Types of Parenchyma

Cited by 12 publications

References 27 publications

Origin and basipetal transport of the IAA responsible for rooting of carnation cuttings

Origin and basipetal transport of the IAA responsible for rooting of carnation cuttings

The effect of intracellular geometry on auxin transport. I. Centrifugation experiments

Growth and composition of eucalyptus and maize on Kenya soils fertilized with phosphate and indole acetic acid /

Contact Info

Product

Resources

About