Fig. 1: Sources of NO production and NO functions in regulating plant growth, development, and adaptive processes.
From: Molecular functions of nitric oxide and its potential applications in horticultural crops
The reductive pathway is based on the reduction of nitrite to NO, whereas the oxidative route relies on the oxidation of aminated molecules, such as l-Arg. The produced NO can be used to transduce external and internal signals to regulate plant development and stress responses by interacting with other cellular messengers. NR, nitrate reductase; Ni:NOR, NO-forming nitrite reductase; mETC, mitochondrial nitrite reduction; NOS, nitric oxide synthase; l-Arg, l-arginine; PA, polyamine; HA, hydroxylamine
