TABLE 2.

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

Temperature	PGR	TSS (mg ml–1)		Total proteins (mg ml–1)		Proline contents (mg ml–1)		H2O2 (nmol ml–1)		MDA (nmol ml–1)
		IR-64	HHZ	IR-64	HHZ	IR-64	HHZ	IR-64	HHZ	IR-64	HHZ
HNT	Vc + Br + MeJA Ve	6.25	12.33	4.95	8.70	0.74	1.16	60.67	59.29	61.25	44.56
	Br + MeJA + Tr	7.70	11.35	4.70	6.95	0.69	1.11	66.17	64.82	67.50	48.82
	Ve + Vc	8.75	12.18	4.08	7.83	0.72	1.13	63.33	62.37	64.58	46.76
	MeJA	6.88	10.75	3.45	6.08	0.66	1.09	67.50	67.68	68.13	50.59
	AC	5.38	10.13	3.41	5.33	0.63	1.06	70.00	70.18	70.83	52.35
HDT	Vc + Br + MeJA Ve	14.05	17.38	7.95	10.95	0.90	1.22	54.00	48.93	48.13	39.26
	Br + MeJA + Tr	11.83	16.13	5.83	8.95	0.85	1.18	59.17	54.11	53.96	43.68
	Ve + Vc	12.88	16.08	6.74	10.08	0.87	1.19	56.50	51.61	51.25	41.47
	MeJA	10.63	14.87	4.97	7.95	0.81	1.16	61.67	56.79	55.29	45.59
	AC	9.88	12.32	4.09	7.33	0.79	1.14	63.67	58.75	58.97	47.50
AT	Vc + Br + MeJA Ve	18.38	24.63	10.45	11.70	1.00	1.32	52.06	32.36	32.38	36.62
	Br + MeJA + Tr	16.50	23.38	9.20	10.45	0.94	1.27	54.50	34.72	34.67	38.97
	Ve + Vc	17.38	24.00	9.70	11.08	0.95	1.29	53.17	33.47	33.33	37.79
	MeJA	15.63	22.50	8.70	9.83	0.92	1.24	55.83	35.83	35.50	40.05
	AC	15.00	21.63	8.33	9.33	0.90	1.21	57.33	36.94	36.33	41.47
Temperature		**	**	**	**	**	**	**	**	**	**
PGR		**	**	**	**	*	*	**	**	**	**
Temperature × PGR		ns	ns	*	ns	ns	ns	ns	ns	ns	ns
CV		14.94	10.33	10.74	15.68	5.48	5.93	5.02	5.15	7.94	4.88

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.