Nitrate inhibition of nodulation can be overcome by the ethylene inhibitor aminoethoxyvinylglycine |
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Authors: | Ligero F Caba J M Lluch C Olivares J |
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Affiliation: | Grupo de Investigación "Fijación de Nitrógeno," Universidad de Granada, Departamento de Biología Vegetal, E-18071 Granada, Spain. |
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Abstract: | Previously, we reported (a) a positive correlation between the nitrate concentrations in growth medium and ethylene evolved from uninoculated and inoculated alfalfa (Medicago sativa) roots and (b) a negative correlation between ethylene evolution and nodulation. Here, we report that the inhibitory effect of NO3− on nodulation of alfalfa can be eliminated by the ethylene inhibitor aminoethoxyvinylglycine (AVG). This effect was probably related to the strong inhibition (90%) of ethylene biosynthesis caused by AVG in these inoculated and NO3−-treated roots. These results support our hypothesis that the inhibitory effect of NO3− is mediated through the phytohormone ethylene. A possible role of endogenous ethylene in the autoregulation of nodulation also is discussed. AVG at 10 micromolar significantly (P < 0.05) increased total nitrogenase activity (acetylene reduction) in 2.5 and 5 millimolar NO3−-fed plants probably as a result of the very high stimulation of nodulation. |
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