Abstract
The ethylene releasing compound, 2-chloroethylphosphonic acid (ethephon) inhibited nodule development in common bean (Phaseolus vulgaris L.) plants. In contrast, inhibitors of ethylene synthesis or its physiological activity enhanced nodulation. In a co-culture of bean seeds and rhizobia, ethephon inhibited rhizobial growth while inhibitors of ethylene synthesis or action did not influence the growth and proliferation of rhizobia. These data emphasize the role of ethylene as a regulator of nodulation in determinate nodulators and indicate that the ethylene signaling pathway involved in the nodulation process is not limited to the plant host but also involves the bacterial symbiont.
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