Table I. Content of Dols, Prens, and phytosterols in Arabidopsis hairy roots exposed to various stress factors.

Dol, Pren, and phytosterol content was estimated using HPLC/UV and gas chromatography-flame ionization detection (GC-FID); n = 3. Results significantly (P < 0.05) different from the control are indicated with asterisks. H₂O₂, Hydrogen peroxide; MV, methyl viologen; t-BHP, tert-butyl hydroperoxide.

Stress		Dol Content	Fraction of Dominating Dols (Dol-14 to Dol-17) in Total Dol Mixture	Fraction of Prens (Pren-14 to Pren-17) in Total Pren Mixture	Phytosterol Content
		μg g−1 fresh wt	%		mg g−1 fresh wt
Osmotic sorbitol (m)	Control	4.4 ± 0.6	67 ± 7	15 ± 1	2.1 ± 0.4
	0.2	4.9 ± 0.6	76 ± 9	22 ± 2	1.9 ± 0.3
	0.3	6.4 ± 0.6*	91 ± 8	36 ± 3	1.9 ± 0.5
	0.4	6.9 ± 0.4*	93 ± 9	35 ± 3	1.9 ± 0.7
	0.5	6.5 ± 0.1*	88 ± 5	38 ± 4	1.9 ± 0.6
Oxidative	Control	4.4 ± 0.2	66 ± 3	14 ± 2	2.0 ± 0.6
	1 mm H2O2	5.3 ± 0.3*	81 ± 4	23 ± 2	1.9 ± 0.2
	0.3 mm t-BHP	5.8 ± 0.6*	88 ± 5	26 ± 2	5.2 ± 0.4*
	1 μm MV	4.0 ± 0.2	61 ± 7	12 ± 1	4.0 ± 0.6*
CdCl2 (μm)	Control	4.4 ± 0.5	67 ± 7	15 ± 2	2.0 ± 0.3
	25	5.6 ± 0.3*	86 ± 8	27 ± 2	2.3 ± 0.3
	50	6.6 ± 0.6*	91 ± 4	28 ± 2	2.0 ± 0.3