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Ethylene inhibitors enhance in vitro root formation on faba bean shoots regenerated on medium containing thidiazuron
Authors:Mutasim Mohamed Khalafalla  Kazumi Hattori
Institution:(1) Laboratory of Plant Genetics and Breeding, Graduate School of Bioagricultural Science, Nagoya University, Chikusa, Nagoya, 464-8601, Japan;(2) Laboratory of Plant Genetics and Breeding, Graduate School of Bioagricultural Science, Nagoya University, Chikusa, Nagoya, 464-8601, Japan
Abstract:The possible involvement of ethylene in in vitrorooting of faba bean (Vicia faba L.) shootsregenerated on medium containing thidiazuron wasinvestigated. The effects of the ethylene precursor1-aminocyclopropane-1-carboxylic acid (ACC) and threeethylene inhibitors, silver nitrate (AgNO3),acetyl salicylic acid (ASA) and cobalt chloride(CoCl2) on root formation were tested in vitrousing TDZ-induced shoots of faba bean accession 760.ACC inhibited root formation. In contrast, ethyleneinhibitors promoted root formation, AgNO3 at theappropriate concentrations enhanced root emergence andincreased root number per shoot, root growth rate, androot length. Both CoCl2 and ASA at theappropriate concentrations increased rootingefficiency. These promotive effects may result from areduction in ethylene concentration or inhibition ofethylene action. The results offer a new approach toimprove the rooting efficiency of TDZ-induced shootsof faba bean and possibly of other plant species.
Keywords:ethylene  faba bean  inhibitors  precursor  thidiazuron
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