Table 1. Summary of the antioxidant enzyme changes in different wheat genotypes and different tissues type under different tested abiotic-stress conditions.

Abiotic stress	SOD	CAT	APX	POX	GR	References
Drought	↓	-	-	↓		Alexieva et al. (2001)
		↑				Luna et al. (2005)
	-	↑	↑	↑	↑	Devi et al. (2012)
	↑	↑	↑		↑	Wang et al. (2008)
Salinity		↑	↑	↑		Barakat (2011)
		↑	↓	↓		Heidari (2009)
	↑	↑			↓	Esfandiari et al. (2007)
	↑	↑			↑	Sairam et al. (2002)
Cold	↑	↑	↑	↑		Janmohammadi et al. (2012)
	↑	-	↑	↑	↑	Turk et al. (2014)
Heat	↑	↑	↑		↑	Badawi et al. (2007)
	↑			↑		Ibrahim et al. (2013)
	↑	↑		↑		Gupta et al. (2013)
	↓↑	↓		↓	↓↑	Wang et al. (2014)
UV-B	↑			↑		Ibrahim et al. (2013)
	↑	↑		-		Alexieva et al. (2001)
	↓	↓		↓	↑	Barabás et al. (1998)

Superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), guaiacol peroxidase (POX) and glutathione reductase (GR). (↑) increase, (↓) decline and (-) unchanged.