Abscisic acid and ethrel abolish the inhibition of adventitious root formation of paclobutrazol-treated bean primary leaf cuttings

I. Tari, M. Nagy

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Paclobutrazol (PB), a triazole growth retardant and an inhibitor of gibberellin biosynthesis, reduced at 17 μM concentration the adventitious root formation of bean primary leaf cuttings. Treatments with 5 μM ABA or 4 μM Ethrel, an ethylene-releasing compound, restored the roofing of PB- treated cuttings. Ethylene production and the content of the precursor 1- aminocyclopropane-1-carboxylic acid (ACC) were enhanced in root- forming tissues of PB-treated petioles 48 h after ABA application. The effect of ABA could be abolished by 10 μM CoCl2, an inhibitor of ACC oxidase. Thus, ABA might stimulate rooting through its effect on ethylene release. 2 mM silver thiosulphate, an inhibitor of ethylene action, decreased the rooting of PB- treated cuttings similarly to Co2+, but failed to negate the ABA effect. These data indicate that the effect of PB on rhizogenesis is not associated directly with the inhibition of the biosynthesis of gibberellins.

Original languageEnglish
Pages (from-to)369-375
Number of pages7
JournalBiologia Plantarum
Volume38
Issue number3
Publication statusPublished - 1996

Fingerprint

paclobutrazol
ethephon
adventitious roots
abscisic acid
beans
1-aminocyclopropane-1-carboxylic acid
leaves
gibberellins
ethylene production
ethylene releasers
rooting
biosynthesis
rhizogenesis
silver thiosulfate
ethylene inhibitors
triazoles
petioles

Keywords

  • 1-aminocyclopropane-1-carboxylic acid
  • ethylene production
  • Phaseolus vulgaris L.

ASJC Scopus subject areas

  • Plant Science

Cite this

Abscisic acid and ethrel abolish the inhibition of adventitious root formation of paclobutrazol-treated bean primary leaf cuttings. / Tari, I.; Nagy, M.

In: Biologia Plantarum, Vol. 38, No. 3, 1996, p. 369-375.

Research output: Contribution to journalArticle

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AB - Paclobutrazol (PB), a triazole growth retardant and an inhibitor of gibberellin biosynthesis, reduced at 17 μM concentration the adventitious root formation of bean primary leaf cuttings. Treatments with 5 μM ABA or 4 μM Ethrel, an ethylene-releasing compound, restored the roofing of PB- treated cuttings. Ethylene production and the content of the precursor 1- aminocyclopropane-1-carboxylic acid (ACC) were enhanced in root- forming tissues of PB-treated petioles 48 h after ABA application. The effect of ABA could be abolished by 10 μM CoCl2, an inhibitor of ACC oxidase. Thus, ABA might stimulate rooting through its effect on ethylene release. 2 mM silver thiosulphate, an inhibitor of ethylene action, decreased the rooting of PB- treated cuttings similarly to Co2+, but failed to negate the ABA effect. These data indicate that the effect of PB on rhizogenesis is not associated directly with the inhibition of the biosynthesis of gibberellins.

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