TABLE 1.

Total soluble sugars (TSS), proteins, proline, H₂O₂, and MDA accumulation in the leaves of two rice cultivar as affected by plant growth regulators under heat stress at heading.

Temperature	PGR	TSS (g kg–1)		Total proteins (g kg–1)		Proline contents (g kg–1)		H2O2 (nmol g–1)		MDA (nmol g–1)
		IR-64	HHZ	IR-64	HHZ	IR-64	HHZ	IR-64	HHZ	IR-64	HHZ
HNT	Vc + Br + MeJA Ve	14.88	30.13	6.22	12.53	1.16	1.52	77.35	74.50	74.13	57.50
	Br + MeJA + Tr	12.50	28.50	4.47	10.28	1.11	1.46	82.33	78.83	79.34	62.22
	Ve + Vc	13.50	29.50	5.22	11.40	1.14	1.49	79.33	75.33	76.91	60.00
	MeJA	11.25	27.50	3.72	9.40	1.09	1.4	85.17	81.00	82.12	64.58
	AC	10.13	26.88	3.10	8.78	1.06	1.4	87.83	83.17	84.72	66.67
HDT	Vc + Br + MeJA Ve	22.63	32.75	10.10	14.90	1.28	1.55	72.67	63.33	61.28	52.64
	Br + MeJA + Tr	19.50	31.63	8.22	13.15	1.22	1.51	77.67	68.67	66.67	57.08
	Ve + Vc	18.63	32.63	9.22	13.90	1.25	1.53	75.17	66.00	64.06	55.00
	MeJA	18.25	29.38	7.22	12.03	1.2	1.49	80.17	71.17	69.10	59.17
	AC	17.38	28.63	6.60	11.28	1.17	1.46	82.33	73.67	71.18	60.97
AT	Vc + Br + MeJA Ve	26.38	34.00	14.50	16.03	1.42	1.67	40.79	62.65	42.50	51.67
	Br + MeJA + Tr	24.63	31.75	13.38	15.15	1.37	1.6	42.89	65.15	44.85	54.31
	Ve + Vc	25.50	32.63	13.88	15.65	1.39	1.63	41.84	63.97	43.68	53.06
	MeJA	23.88	30.88	12.75	14.65	1.35	1.57	43.95	66.18	46.03	55.42
	AC	23.13	30.25	12.38	14.15	1.33	1.55	45.00	67.35	47.21	56.39
Temperature		**	**	**	**	**	*	**	**	**	**
PGR		*	*	**	**	*	*	*	**	**	*
Temperature × PGR		NS	NS	NS	NS	NS	NS	NS	NS	NS	NS
CV		9.91	8.42	8.44	9.84	6.27	7.52	6.62	7.13	9.91	7.34

PGR; CV; HHZ; IR-64; NS; ** and *; HDT; HNT, and AT stand for plant growth regulators; coefficient of variation; heat tolerant (HZZ); heat susceptible (IR-64); non-significant; significantly different at α = 0.01 and 0.05, high day; high night, and ambient temperature, correspondingly. Vc; MeJA; Ve; Tr; Br, and AC represent vitamin C, methyl jasmonates, vitamin E, triazoles; brassinosteroids, and control applied at the rate of 1.4, 1.8, 6.9, 0.55 4.0, and 0 mg L^–1, respectively.