Abstract
Nitric oxide (NO) influences many aspects of plant development and responses to stress.The concentration of NO can play an important role in influencing its action (for example, in stomatal regulation; Wilson et al., 2009) so that the mechanisms through which NO content is modulated must be an important facet of NO research. Whilst NO generation mechanisms are clearly important, NO removal is of equal relevance, especially as plants will be continually exposed to NOx (NO + NO2) gases derived from soil microbial activity (Mur et al., 2013). Establishing and regulating a poise between NO generation, NO fumigation from external sources and NO scavenging, which also needs to be flexible enough to change in response to a variety of physiological cues, is an under-considered aspect of plant NO biology.
Highlights
HOW ARE Nitric oxide (NO) GENERATION MECHANISMS INTEGRATED AND REGULATED? Initially, many sought to find an equivalent to the mammalian Nitric Oxide Synthase (NOS) enzymes in plants
Resolution of this conundrum may derive from the observation that polyamine leads to NO production from Arabidopsis roots (Tun et al, 2006)
nitrate reductase (NR) acts by reducing nitrite to NO with NAD(P)H acting as an electron donor
Summary
HOW ARE NO GENERATION MECHANISMS INTEGRATED AND REGULATED? Initially, many sought to find an equivalent to the mammalian Nitric Oxide Synthase (NOS) enzymes in plants. HOW ARE NO GENERATION MECHANISMS INTEGRATED AND REGULATED? NOS is a cytochrome P450-like enzyme which oxidizes arginine to citrulline to generate NO (Gorren and Mayer, 2007). NR-generated NO has been shown to regulate floral development, root formation, stomatal opening, and responses to biotic and abiotic stresses [reviewed in Mur et al (2013)].
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
