Abscisic acid and Ethrel abolish the inhibition of adventitious root formation of paclobutrazol-treated bean primary leaf cuttings |
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Authors: | I Tari M Nagy |
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Institution: | (1) Department of Plant Physiology, Attila József University, P.O. Box 654, H-6701 Szeged, Hungary |
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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 ethylenereleasing
compound, restored the rooting of PB-treated cuttings. Ethylene production and the content of the precursor 1-aminocyclopropane-l-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
Acknowledgements: We are grateful to Gabriella Biró. This work was supported by the Hungarian National Science Research Foundation
(OTKA), Project No. 462. |
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Keywords: | 1-aminocyclopropane-l-carboxylic acid ethylene production Phaseolus vulgaris L |
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