Opposing roles for superoxide and nitric oxide in the NaCl stress-induced upregulation of antioxidant enzyme activity in cotton callus tissue

By Shantel A. Vital, Rocky Fowler, Alvarro Virgen, D. Gossett, S. W. Banks, Juan Rodriguez. 2008

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Production of reactive oxygen species and development of antioxidative systems during in vitro growth and ex vitro transfer (2008, background): “Therefore the authors suggested that ROS are involved in “turning on” antioxidative defence (Vital et al. 2008).”
Exogenous nitric oxide improves antioxidative capacity and reduces auxin degradation in roots of Medicago truncatula seedlings under cadmium stress (2009, background): “NO also improves plant tolerance to both abiotic and biotic stresses (Hsu and Kao 2004; Sun et al. 2007; Zhang et al. 2008; Vital et al. 2008; Yang et al. 2006).”
Roles of enzymatic and nonenzymatic antioxidants in plants during abiotic stress (2010, background): “Increase in catalase activity is supposed to be an adaptive trait possibly helping to overcome the damage to tissue metabolism by reducing toxic levels of H 2 O 2 (Sekmen, Türkan, & Takio, 2007; Vital et al., 2008).”