Does Auxin Play a Role in the Release of Apical Dominance by Shoot Inversion in Ipomoea nil?

Prasad, T. K.; Li, X.; Abdel-Rahman, A. M.; Hosokawa, Z.; Cloud, N. P.; LaMotte, Clifford E.; Cline, Morris G.

doi:10.1006/anbo.1993.1028

Cited by 56 publications

(50 citation statements)

References 27 publications

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“…Removal of the active shoots results in release of the inhibited axillary meristems, which can be prevented by application of auxin to the decapitated stump. The auxin in the polar transport stream inhibits bud growth indirectly, since it does not enter the bud (36)(37) . Several non-exclusive mechanisms have been proposed to account for this.…”

Section: Auxin's Roles In Plant Developmentmentioning

confidence: 99%

Computer simulation: The imaginary friend of auxin transport biology

et al. 2010

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Regulated transport of the plant hormone auxin is central to many aspects of plant development. Directional transport, mediated by membrane transporters, produces patterns of auxin distribution in tissues that trigger developmental processes, such as vascular patterning or leaf formation. Experimentation has produced a lot of largely qualitative data providing strong evidence for multiple feedback systems between auxin and its transport. However the exact mechanisms concerned remain elusive and the experiments required to evaluate alternative hypotheses are challenging. Because of this, computational modelling now plays an important role in auxin transport research. Here we review current approaches and underlying assumptions of computational auxin transport models, including recent attempts to unify conflicting mechanistic explanations. In addition we discuss in general how computer simulation of these processes is proving to be an increasingly effective method of hypothesis generation and testing, and how simulation can be used to direct future experiments.

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Section: Auxin's Roles In Plant Developmentmentioning

confidence: 99%

Computer simulation: The imaginary friend of auxin transport biology

et al. 2010

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“…However, auxin transport often occurs too slowly to account for the kinetics of bud repression (Hall and Hillman, 1975;Brown et al, 1979;Everat-Bourbouloux and Bonnemain, 1980). Furthermore, in many species, although basipetal auxin transport in the stem is required, the auxin does not appear to enter the bud (Hillman et al, 1977;Morris, 1977;Brown et al, 1979;Everat-Bourbouloux and Bonnemain, 1980;Prasad et al, 1993). Consistent with this finding, endogenous auxin levels in axillary buds do not correlate with the degree of bud inhibition.…”

Section: Introductionmentioning

confidence: 97%

Auxin Acts in Xylem-Associated or Medullary Cells to Mediate Apical Dominance

2003

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A role for auxin in the regulation of shoot branching was described originally in the Thimann and Skoog model, which proposes that apically derived auxin is transported basipetally directly into the axillary buds, where it inhibits their growth. Subsequent observations in several species have shown that auxin does not enter axillary buds directly. We have found similar results in Arabidopsis. Grafting studies indicated that auxin acts in the aerial tissue; hence, the principal site of auxin action is the shoot. To delineate the site of auxin action, the wild-type AXR1 coding sequence, which is required for normal auxin sensitivity, was expressed under the control of several tissue-specific promoters in the auxin-resistant, highly branched axr1-12 mutant background. AXR1 expression in the xylem and interfascicular schlerenchyma was found to restore the mutant branching to wild-type levels in both intact plants and isolated nodes, whereas expression in the phloem did not. Therefore, apically derived auxin can suppress branching by acting in the xylem and interfascicular schlerenchyma, or in a subset of these cells.

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“…It is transported along the shoot-root axis from cell to cell in a polar manner, which is essential for inhibiting the outgrowth of axillary buds Leyser, 2003;Sieberer and Leyser, 2006). However, a large body of evidence suggests that auxin cannot directly enter the axillary buds and that a second messenger is required to inhibit the outgrowth of axillary buds (Shelagh and John, 1975;Morris, 1977;Pilate et al, 1989;Prasad et al, 1993;Booker et al, 2003). Cytokinin is the first reported second messenger candidate, which is synthesized in roots and transported acropetally in the xylem to promote directly the outgrowth of axillary buds (Van Dijck et al, 1988;Cline, 1991;Eklof et al, 1997;Kapchina-Toteva et al, 2000;Nordstrom et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

DWARF27, an Iron-Containing Protein Required for the Biosynthesis of Strigolactones, Regulates Rice Tiller Bud Outgrowth

et al. 2009

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Tillering in rice (Oryza sativa) is one of the most important agronomic traits that determine grain yields. Previous studies on rice tillering mutants have shown that the outgrowth of tiller buds in rice is regulated by a carotenoid-derived MAX/RMS/D (more axillary branching) pathway, which may be conserved in higher plants. Strigolactones, a group of terpenoid lactones, have been recently identified as products of the MAX/RMS/D pathway that inhibits axillary bud outgrowth. We report here the molecular genetic characterization of d27, a classic rice mutant exhibiting increased tillers and reduced plant height. D27 encodes a novel iron-containing protein that localizes in chloroplasts and is expressed mainly in vascular cells of shoots and roots. The phenotype of d27 is correlated with enhanced polar auxin transport. The phenotypes of the d27 d10 double mutant are similar to those of d10, a mutant defective in the ortholog of MAX4/RMS1 in rice. In addition, 29-epi-5-deoxystrigol, an identified strigolactone in root exudates of rice seedlings, was undetectable in d27, and the phenotypes of d27 could be rescued by supplementation with GR24, a synthetic strigolactone analog. Our results demonstrate that D27 is involved in the MAX/RMS/D pathway, in which D27 acts as a new member participating in the biosynthesis of strigolactones.

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Does Auxin Play a Role in the Release of Apical Dominance by Shoot Inversion in Ipomoea nil?

Cited by 56 publications

References 27 publications

Computer simulation: The imaginary friend of auxin transport biology

Computer simulation: The imaginary friend of auxin transport biology

Auxin Acts in Xylem-Associated or Medullary Cells to Mediate Apical Dominance

DWARF27, an Iron-Containing Protein Required for the Biosynthesis of Strigolactones, Regulates Rice Tiller Bud Outgrowth

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