Table 3.

Effect of Drought, heat, and combined drought and heat on chlorophyll a (Chla), chlorophyll b (Chlb), Chla/b, total chlorophyll (Chla+b), and carotenoids in leaves of the eggplant cultivars after 30 days of stress application.

cv	Treatments	Chla (µg g−1 FW)	Chlb (µg g−1 FW)	Chla/b	Chla+b (µg g−1 FW)	Carotenoids (µg g−1 FW)
‘Adriatica’	C	764.9 ± 2.1 a	351.2 ± 4.5 a	2.17 ± 4.5 a	1116.1 ± 2.5 a	269.3 ± 5.9 a
	D	695.8 ± 2.7 b	346.2 ± 2.1 b	2.00 ± 3.3 b	1042.0 ± 2.7 b	237.5 ± 2.5 b
	H	332.5 ± 1.2 c	261.3 ± 2.3 c	1.27 ± 1.3 c	593.8 ± 2.1 c	149.9 ± 2.1 c
	H + D	161.7 ± 2.5 d	160.2 ± 2.3 d	1.01 ± 4.3 d	321.9 ± 3.2 d	113.1 ± 3.2 d
‘Black Beauty’	C	766.5 ± 1.7 a	355.3 ± 3.4 a	2.15 ± 3.4 a	1121.8 ± 3.4 a	274.2 ± 2.5 a
	D	691.8 ± 1.4 b	351.1 ± 3.5 b	1.97 ± 2.2 a	1042.9 ± 3.3 b	242.3 ± 4.3 b
	H	337.5 ± 1.5 c	266.2 ± 1.2 c	1.26 ± 2.1 b	603.7 ± 1.3 c	153.7 ± 1.3 c
	H + D	156.8 ± 2.2 d	164.5 ± 4.1 d	0.95 ± 3.1 c	321.3 ± 3.2 d	118.5 ± 2.3 d
‘Bonica’	C	617.5 ± 2.7a	304.1 ± 1.3 a	2.03 ± 8.6 a	921.6 ± 3.2 a	147.6 ± 2.8 a
	D	515.3 ± 3.2 a	280.2 ± 3.7 a	1.83 ± 6.9 a	795.5 ± 2.3 a	140.8 ± 1.9 a
	H	450.1 ± 3.6 a	250.6 ± 2.6 a	1.79 ± 3.5 a	700.7 ± 5.2 a	124.8 ± 1.7 a
	H + D	405.1 ± 2.5 a	202.5 ± 3.3 a	2.00 ± 2.9 a	607.6 ± 3.6 a	105.7 ± 1.6 a
‘Galine’	C	614.4 ± 3.2 a	298.2 ± 3.1 a	2.06 ± 3.4 a	912.6 ± 4.1 a	142.5 ± 1.3 a
	D	511.2 ± 1.2 a	277.1 ± 1.2 a	1.84 ± 2.1 a	788.3 ± 1.1 a	132.7 ± 2.5 a
	H	445.3 ± 5.2 a	244.5 ± 3.2 a	1.82 ± 7.5 a	689.8 ± 3.3 a	120.2 ± 3.2 a
	H + D	400.1 ± 2.5 a	200.5 ± 3.3 a	1.99 ± 1.3 a	606.6 ± 4.2 a	103.5 ± 2.1 a

Data are means ± SE of four repetitions. Significant differences are shown by different lowercase letters between treatments (p = 0.05) based on Tukey’s HSD test. (C, control; H, heat stress; D, drought stress; H + D, heat + drought stresses).