Journal
PLANT SIGNALING & BEHAVIOR
Volume 4, Issue 9, Pages 853-855Publisher
TAYLOR & FRANCIS INC
DOI: 10.1093/jxb/erp077
Keywords
hydroxylamine; nitric oxide; oxidative NO formation; reactive oxygen species; salicyl hydroxamate; superoxide dismutase
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At least theoretically, plants may synthesize nitric oxide (NO) either by reduction of N in higher oxidations states, or by oxidation of more reduced N-compounds. The well established reductive pathway uses nitrite as a substrate, produced by cytosolic nitrate reductase. The only oxidative pathway described so far comprises nitric oxide synthase (NOS)-like activity, where guanidino-N from L-arginine is oxidized to NO. In our previous paper we have demonstrated yet another form of oxidative NO formation, whereby hydroxylamine (HA), but also the AOX-inhibitor salicylhydroxamate (SHAM) is oxidized to NO by tobacco suspension cells. Oxidation of HA to NO was also demonstrated in vitro by using ROS producing enzymes. Apparently superoxide radicals and/ or hydrogen peroxide served as oxidants. Another unexpected observation pointed to a special role for superoxide dismutase in oxidative NO formation.
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