“…Nitric oxide has been suggested to be involved in defense responses to biotic and abiotic stresses (Wendehenne et al, 2004) and appears to be present in most of stress reactions. It has been reported to exert a protective effect in response to drought stress (Mata and Lamattina, 2001), osmotic stress (Wang et al, 2004;Zhao et al, 2008), salt stress (Shi et al, 2007;Li et al, 2008;Sheokand et al, 2008), heavy metal stress (Kopyra and Gwozdz, 2003;Hsu and Kao, 2004;Wang and Yang, 2005;Singh et al, 2008) and oxidative stress (Beligni and Lamattina, 2002).…”