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Involvement of nitrate reductase in auxin-induced NO synthesis

It is well known for a long time, that nitric oxide (NO) functions in variable physiological and developmental processes in plants, however the source of this signaling molecule in the diverse plant responses is a very obscure.1 Although existance of nitric oxide sythase (NOS) in plants is still questionable, LNMMA (NG–monomethyl-L-arginine) -sensitive NO generation was observed in different plant species.2,3 In addition, nitrate reductase (NR) is confirmed to have a major role as source of NO.4,5 This multifaced molecule acts also in auxin-induced lateral root (LR) formation, since exogenous auxin enhanced NO levels in regions of Arabidopsis LR initiatives. Our results pointed out the involvement of nitrate reductase enzyme in auxin-induced NO formation. In this addendum, we speculate on auxin-induced NO production in lateral root primordial formation. Addendum to: Kolbert Zs, Bartha B, Erdei L. Exogenous auxin-induced NO synthesis is nitrate reductase-associated in Arabidopsis thaliana root primordia. J Plant Physiol 2008; 165:967-75.