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Implication of Ethylene in the Release of Secondary Dormancy in Amaranthus caudatus L. Seeds by Gibberellins or Cytokinin

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Abstract

Ethephon (Eth), gibberellin A3, A4 + 7 (GA3, GA4 + 7), and 6-benzyladenine (BA) removed secondary dormancy of Amaranthus caudatus seeds. The GAs and BA potentiated the effect of ethephon or 1-aminocyclopropane-1-carboxylic acid (ACC), an ethylene biosynthesis precursor, in terms of the rate or final percent of germination. Aminoethoxyvinylglycine (AVG), an ACC synthase activity inhibitor, was observed to simultaneously inhibit the release from dormancy effected by GA3 or BA as well as the ethylene production stimulated by these regulators. Breaking of secondary dormancy by GA3, GA4 + 7 or BA was prevented by 2,5-norbornadiene (NBD), an inhibitor of ethylene binding. Ethylene completely or markedly reversed the inhibitory effect of NBD. We thus conclude that the removal of secondary dormancy in Amaranthus caudatus seeds by gibberellin or benzyladenine involves ethylene biosynthesis and action.

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Abbreviations

ACC:

1-aminocyclopropane-1-carboxylic acid

AVG:

Aminoethoxyvinylglycine

BA:

6-benzyladenine

E:

ethylene

Eth:

ethephon

GA3:

gibberellin A3

GA4 + 7,:

gibberellins A4 + A7

NBD:

2,5 norbornadiene

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Authors and Affiliations

  1. Department of Plant Physiology and Biotechnology, University of Szczecin, Wąska 13, 71-415, Szczecin, Poland

    Jan Kępczyński, Magdalena Bihun & Ewa Kępczyńska

Authors
  1. Jan Kępczyński
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  2. Magdalena Bihun
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  3. Ewa Kępczyńska
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Correspondence to Jan Kępczyński.

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Kępczyński, J., Bihun, M. & Kępczyńska, E. Implication of Ethylene in the Release of Secondary Dormancy in Amaranthus caudatus L. Seeds by Gibberellins or Cytokinin. Plant Growth Regul 48, 119–126 (2006). https://doi.org/10.1007/s10725-005-5616-x

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  • DOI: https://doi.org/10.1007/s10725-005-5616-x

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