Table 4.

Effect of heat stress on activities of catalase (CAT), peroxidase (POD) and superoxide dismutase (SOD) in faba bean genotypes.

Treatments	Genotypes
	Zafar 1	Zafar 2	Giza Blanka	Espan	Makamora	Shebam 1	Giza 3	C4	C5	G853
	CAT activity (units mg−1 protein min−1)
Control	156.33 ± 2.19i	142.67 ± 1.45jk	143.00 ± 1.15jk	146.67 ± 1.86j	165.00 ± 1.73hi	136.00 ± 2.31 k	139.33 ± 0.88jk	171.67 ± 3.71gh	180.00 ± 3.61 fg	191.00 ± 2.08e
T1 at 32 °C	185.00 ± 2.31ef	186.33 ± 2.73ef	158.67 ± 0.88i	158.67 ± 2.03i	177.33 ± 2.19 fg	159.00 ± 4.36i	183.67 ± 2.60ef	206.33 ± 2.73 cd	224.00 ± 2.65b	209.00 ± 3.21 cd
T2 at 38 °C	223.67 ± 2.73b	201.67 ± 4.91d	185.33 ± 2.03ef	179.67 ± 0.33 fg	191.00 ± 3.79e	172.00 ± 1.73gh	213.67 ± 6.44c	237.33 ± 6.77a	244.33 ± 2.33a	236.33 ± 2.40a
	POD activity (unit min−1 g−1 FW)
Control	10.20 ± 0.80 m	20.33 ± 0.32 h	13.63 ± 0.18kl	16.27 ± 0.27jk	19.83 ± 0.15hi	11.27 ± 0.27 lm	16.43 ± 0.24j	17.30 ± 0.76ij	22.50 ± 1.22fgh	13.70 ± 0.12kl
T1 at 32 °C	13.77 ± 1.29kl	24.37 ± 0.77cdefg	17.23 ± 1.29ij	20.10 ± 0.62 h	24.77 ± 1.07cdef	15.70 ± 1.60jk	21.87 ± 1.17gh	20.50 ± 0.23 h	26.17 ± 0.84bcde	17.50 ± 1.22ij
T2 at 38 °C	21.70 ± 0.61gh	26.27 ± 0.44bcd	23.90 ± 0.64defg	23.50 ± 0.91efg	27.57 ± 0.64ab	19.83 ± 0.71hi	25.93 ± 0.61 bcde	26.63 ± 0.68abc	29.00 ± 0.67a	23.67 ± 1.61defg
	SOD activity (units mg−1 protein min−1)
Control	11.33 ± 1.86lmn	13.00 ± 1.53klm	12.33 ± 0.88klmn	8.67 ± 2.19n	9.33 ± 1.45mn	8.33 ± 0.88n	9.67 ± 0.67mn	9.33 ± 1.86mn	11.33 ± 0.88lmn	15.00 ± 1.53hijkl
T1 at 32 °C	17.33 ± 1.45fghij	18.67 ± 1.45defgh	18.33 ± 1.20efghi	16.33 ± 1.20ghijk	15.00 ± 2.08hijkl	12.00 ± 1.53lmn	14.00 ± 1.15jkl	14.33 ± 0.88ijkl	17.33 ± 1.20fghij	20.33 ± 1.76cdefg
T2 at 38 °C	24.00 ± 1.53bc	24.33 ± 0.33abc	25.00 ± 0.58ab	22.67 ± 0.88bcd	21.67 ± 0.88bcde	18.67 ± 0.33defgh	21.00 ± 0.58bcdef	18.67 ± 0.88defgh	24.00 ± 0.58bc	28.00 ± 0.58a

Means followed by a similar letter within a column for each parameter are not significantly different at the 0.05 level of probability by Duncan’s multiple-range test.