Cited by 165Plant Molecular Biology ResearchPlant Parasitism and ResistancePlant nutrient uptake and metabolism

Transport of exogenous auxin in two-branched dwarf pea seedlings (Pisum sativum L.): Some implications for polarity and apical dominance

Morris, D. A.·1977·Planta

Abstract

Dwarf pea plants bearing two cotyledonary shoots were obtained by removing the epicotyl shortly after germination, and the patterns of distribution of (14)C in these plants was investigated following the application of [(14)C]IAA to the apex of one shoot. Basipetal transport to the root system occurred, but in none of the experiments was (14)C ever detected in the unlabelled shoot even after transport periods of up to 48 h. This was true both of plants with two equal growing shoots and of plants in which one shoot had become correlatively inhibited by the other, and in the latter case applied whether the dominant or subordinate shoot was labelled. In contrast, when [(14)C]IAA was applied to a mature foliage leaf of one shoot transfer of (14)C to the other shoot took place, although the amount transported was always low. Transport of (14)C from the apex of a subordinate shoot on plants bearing one growing and one inhibited shoot was severely restricted compared with the transport from the dominant shoot apex, and in some individual plants no transport at all was detected. Removal of the dominant shoot apex rapidly restored the capacity of the subordinate shoot to transport apically-applied [(14)C]IAA, and at the same time led to rapid cambial development and secondary vascular differentiation in the previously inhibited shoot. Applications of 1% unlabelled IAA in lanolin to the decapitated dominant shoot maintained the inhibition of cambial development in the subordinate shoot…

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Crossref · 10.1007/bf00387930

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27 of 27 references verified0 citation errors · 0 not checkable

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  • The inhibitory effect of auxin on bud outgrowth is not direct.

    “However, the inhibitory effect of auxin is not direct. It was shown that external auxin application to axillary buds does not prevent their outgrowth and experiments with radiolabeled auxin revealed that apex-derived auxin does not enter the dormant bud. Additionally, auxin transport appears to be too slow to mediate a direct effect (Hall and Hillman, 1975; Morris, 1977; Everat-Bourbouloux and Bon”

    From Shaping plant architecture (2015) · cites this paper as Morris, 1977

  • Auxin levels increase as buds begin to grow, and bud activity correlates with the presence of active polar auxin transport.

    “Certainly, auxin levels increase as buds begin to grow (Gocal et al., 1991;Hillman, 1984;Pearce et al., 1995), and bud activity correlates with the presence of active polar auxin transport (Morris and Johnson, 1990;Morris, 1977).”

    From The hormonal regulation of axillary bud growth in <i>Arabidopsis</i> (2000) · cites this paper as Morris, 1977

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Authors
Morris, D. A.
Affiliations
University of Southampton (GB)
Corresponding author
Morris, D. A.
Venue
Planta
Published
1977
Volume
136
Issue
1
Pages
91-96
ISSN
  • 0032-0935 (ISSN-L)
  • 1432-2048
OpenAlex
W2313495192
Cited by
165
References
27
Citations by year
2026: 2 · 2025: 4 · 2024: 4 · 2023: 5 · 2022: 2 · 2021: 3 · 2020: 5 · 2019: 5 · 2018: 7 · 2017: 4 · 2016: 4 · 2015: 9 · 2014: 4 · 2013: 3 · 2012: 4
FWCI
4.48
Type
journal article
Language
en
Open access
closed
Locations
  • Planta (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Molecular Biology Research
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Parasitism and Resistance
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant nutrient uptake and metabolism
Keywords
auxin transport, indole-3-acetic acid, dwarf pea, Pisum sativum, apical dominance, basipetal transport, apical transportation, shoot apex

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