Table 7.

Electrolyte leakage, Photosystem (PS) II function, Chlorophyll (Chl) concentration and 2,3,5-Triphenyl tetrazolium chloride (TTC) reduction ability in normal-sown (NS) and late-sown (LS) plants of heat-tolerant (HT) and heat-sensitive (HS) genotypes (Mean ± SE).

Genotypes	Electrolyte leakage (%)		PS II (Fv/Fm ratio)		Chlorophyll (mg/g DW)		TTC reduction ability (Absorbace530/g FW)
	NS	LS	NS	LS	NS	LS	NS	LS
IG2507 (T)	13.5 ± 2.5a	19.4 ± 2.6b	0.8 ± 0.04a	0.68 ± 0.06a	15.6 ± 1.9a	12.4 ± 1.9a	0.23 ± 0.03a	0.19 ± 0.03a
IG3263(T)	12.8 ± 2.9a	18.4 ± 2.1b	0.79 ± 0.03a	0.71 ± 0.07a	16.8 ± 2.1a	13.1 ± 1.7a	0.21 ± 0.04a	0.17 ± 0.03a
IG3745(T)	14.3 ± 2.6a	19.5 ± 1.8b	0.8 ± 0.05a	0.69 ± 0.05a	14.7 ± 1.8a	11 ± 1.7a	0.25 ± 0.05a	0.18 ± 0.02a
IG4258(T)	15.3 ± 2.8a	20.3 ± 1.6b	0.78 ± 0.04a	0.7 ± 0.06a	14.9 ± 1.7a	10.8 ± 1.6a	0.24 ± 0.03a	0.2 ± 0.02a
FLIP2009(T)	12.4 ± 1.8a	18.4 ± 1.5b	0.8 ± 0.05a	0.68 ± 0.08a	15.1 ± 1.8a	11.7 ± 1.8a	0.21 ± 0.03a	0.18 ± 0.02a
IG2821(S)	13.2 ± 2.5a	24.3 ± 2.2a	0.8 ± 0.06a	0.59 ± 0.08b	14.9 ± 1.9a	7.9 ± 1.3b	0.23 ± 0.04a	0.11 ± 0.03b
IG2849(S)	12.7 ± 2.4a	23.4 ± 2.8a	0.8 ± 0.05a	0.56 ± 0.07b	15.6 ± 1.7a	8.3 ± 1.5b	0.22 ± 0.05a	0.13 ± 0.02b
IG4242(S)	14.1 ± 2.8a	25.5 ± 2.9a	0.78 ± 0.05a	0.58 ± 0.08b	14.5 ± 1.7a	4.8 ± 1.2d	0.24 ± 0.03a	0.13 ± 0.02b
IG3973 (S)	12.5 ± 2.9a	21.3 ± 2.7a	0.79 ± 0.07a	0.52 ± 0.06b	16.3 ± 1.8a	9.3 ± 1.2b	0.21 ± 0.05a	0.12 ± 0.03b
IG3964 (S)	13.2 ± 2.5a	23.4 ± 2.6a	0.8 ± 0.08a	0.58 ± 0.08b	13.8 ± 1.6ab	6.9 ± 1.3c	0.24 ± 0.03a	0.11 ± 0.02b
LSD (P < 0.05; genotype × date of sowing Interaction)	3.1		0.084		1.92		0.04

Similar letters in a vertical column indicate no significant difference from each other. LSD, least significant difference; Fv, variable fluorescence; Fm, maximum fluorescence.