Table 3.

Effects of paclobutrazol on vitamins C and vitamin E contents and activities of catalase (CAT) and superoxide dismutase (SOD) in the leaves of Curcuma alismatifolia Gagnep. cv. Chiang Mai Pink during 0–30 days of water being withheld.

	Treatment	Water withholding
		0 day	10 days	20 days	30 days
Vitamin C content (mg/100 g fresh weight)	Well-watered	4.1 ± 0.30b	4.2 ± 0.40c	4.3 ± 0.30d	5.3 ± 0.40d
	No water	4.1 ± 0.30b	4.6 ± 0.30c	5.2 ± 0.50c	6.4 ± 0.40c
		4.1 ± 0.10b	5.0 ± 0.20b	6.8 ± 0.10b	9.0 ± 0.15b
	No water + 1500 ppm PBZ	5.2 ± 0.30a	5.8 ± 0.30a	7.1 ± 0.40a	9.5 ± 0.50a
F-test		∗	∗	∗	∗
Vitamin E content (mg/100 g fresh weight)	Well-watered	0.6 ± 0.04b	0.6 ± 0.06b	0.6 ± 0.01c	0.6 ± 0.01b
	No water	0.6 ± 0.05b	0.6 ± 0.01b	0.8 ± 0.04b	0.4 ± 0.04c
		0.7 ± 0.02a	0.6 ± 0.02b	0.6 ± 0.03c	0.7 ± 0.03b
	No water + 1500 ppm PBZ	0.7 ± 0.01a	0.7 ± 0.06a	1.1 ± 0.07a	1.2 ± 0.05a
F-test		∗	∗	∗	∗
CAT activity (Kunit/L)	Well-watered	67.2 ± 6.60b	40.7 ± 1.12b	29.5 ± 3.80b	45.2 ± 3.91c
	No water	67.1 ± 6.62b	38.1 ± 0.72b	54.8 ± 2.13a	79.0 ± 3.91b
		93.3 ± 6.80a	49.7 ± 1.65a	56.5 ± 0.75a	85.8 ± 3.90b
	No water + 1500 ppm PBZ	94.4 ± 6.30a	51.6 ± 3.98a	57.5 ± 1.62a	144.5 ± 3.80a
F-test		∗	∗	∗	∗
SOD activity (% inhibition)	Well-watered	72.5 ± 1.90b	71.8 ± 0.25c	76.5 ± 2.46b	85.3 ± 0.63b
	No water	72.5 ± 1.90b	71.3 ± 1.03c	80.3 ± 0.52a	86.4 ± 0.48ab
		78.6 ± 1.50a	74.0 ± 0.86b	80.2 ± 0.36a	87.2 ± 1.44a
	No water + 1500 ppm PBZ	79.6 ± 0.90a	77.2 ± 1.52a	79.8 ± 0.66a	87.1 ± 0.41a
F-test		∗	∗	ns	∗

The data are expressed as the means of three replications ± standard deviation (SD). F-test, ns: no significant difference; ^∗: significant difference at p < 0.05. Mean sharing with the different letters in a single column of the same parameter is considered significantly different by the least significance difference (LSD) test.