Table 1.

Hydrogen peroxide (H₂O₂), superoxide radical (O₂⁻) and malondialdehyde (MDA) contents at 30, 37 and 42 °C in shoots and roots of “C. moschata”, “C. maxima” and “Maxchata”. Values are mean ± SD (n = 3) and percent higher as compared to control (30 °C). Different letters indicate significant difference among various temperature treatments of each genotype (p < 0.05).

Plant organ	Genotypes	Temperature (°C)	H2O2 content		O2− content		MDA content
			(μmol g−1 FW)	% Change compared to the control	(nmol min−1 g−1 FW)	% Change compared to the control	(nmol g−1 FW)	% Change compared to the control
Stem	C. moschata	30	3.32 ± 0.25 b	-	4.46 ± 0.24 b	-	53.55 ± 5.55 a	-
		37	3.80 ± 0.21 ab	14.9	5.65 ± 0.48 a	27.0	65.15 ± 6.33 a	21.7
		42	4.04 ± 0.23 a	22.3	6.39 ± 0.29 a	43.5	77.26 ± 6.15 b	44.8
	C. maxima	30	3.11 ±0.25 c	-	5.13 ± 0.18 c	-	49.73 ± 5.72 a	-
		37	4.40 ± 0.35 b	41.8	7.43 ± 0.31 b	44.7	70.61 ± 4.04 b	42.9
		42	5.21 ± 0.30 a	67.4	9.26 ± 0.320 a	80.4	89.12 ± 5.37 c	81.4
	Maxchata	30	3.18 ± 0.1 b	-	4.97 ± 0.333 c	-	51.41 ± 3.85 a	-
		37	3.76 ± 0.27 ab	18.5	6.43 ± 0.34 b	29.5	66.11 ± 5.26 b	29.0
		42	4.46 ± 0.16 a	40.3	7.52 ± 0.32 a	21.7	82.75 ± 5.89 c	61.4
Root	C. moschata	30	2.37 ± 0.24 a	-	3.68 ± 0.35 b	-	42.68 ± 3.02 b	-
		37	2.65 ± 0.20 a	12.7	4.34 ± 0.22 b	18.0	50.13 ± 3.44 ab	17.5
		42	2.80 ± 0.28 a	18.4	5.14 ± 0.26 a	40.0	57.74 ± 4.85 a	35.7
	C. maxima	30	2.28 ± 0.17b	-	3.91 ± 0.20 c	-	41.74 ± 3.94 c	-
		37	2.98 ± 0.36 ab	31.7	5.45 ± 0.17 b	39.6	56.52 ± 3.63 b	35.8
		42	3.67 ± 0.27 b	61.0	6.68 ± 0.31 a	70.7	69.87 ± 4.54 a	68.5
	Maxchata	30	2.29 ± 0.16 c	-	3.87 ± 0.18 c	-	43.99 ± 4.51 b	-
		37	2.62 ± 0.29 b	15.0	4.69 ± 0.32 b	51.5	54.53 ± 4.94 ab	25.3
		42	3.05 ± 0.12 a	33.6	5.70 ± 0.31 a	47.3	65.38 ± 5.16 a	50.4