Table 1.

Changes in the lignin content and monomer composition of root, stem and leaf of soybean untreated (0 mM) or treated with BOA

		BOA (mM)
	0	0.1	0.2	0.3
			Root
Lignin	126.9 ± 8.7	147.4 ± 3.9*	146.7 ± 1.0*	156.6 ± 4.2*
H	0.23 ± 0.01	0.29 ± 0.02*	0.65 ± 0.05*	0.28 ± 0.03
G	3.19 ± 0.18	3.59 ± 0.19	4.74 ± 0.37*	4.41 ± 0.26*
S	1.12 ± 0.08	1.44 ± 0.10*	1.57 ± 0.13*	1.61 ± 0.13*
H + G + S	4.54 ± 0.23	5.32 ± 0.31	6.96 ± 1.04*	6.30 ± 0.40*
H : G : S ratio	5 : 70 : 25	5 : 68 : 27	9 : 68 : 23	4 : 70 : 26
S/G ratio	0.35 ± 0.03	0.40 ± 0.01	0.33 ± 0.02	0.37 ± 0.01
			Stem
Lignin	134.0 ± 5.0	175.4 ± 1.7*	176.5 ± 3.8*	180.3 ± 0.4*
H	0.26 ± 0.01	0.31 ± 0.01	0.60 ± 0.05*	0.35 ± 0.03*
G	7.16 ± 0.36	8.25 ± 0.20	14.4 ± 1.00*	17.0 ± 1.09*
S	4.75 ± 0.29	4.56 ± 0.38	6.64 ± 0.50*	7.61 ± 0.32*
H + G + S	12.2 ± 0.49	13.1 ± 0.56	21.6 ± 1.48*	24.9 ± 1.42*
H : G : S ratio	2 : 59 : 39	2 : 63 : 35	3 : 66 : 31	2 : 68 : 30
S/G ratio	0.67 ± 0.05	0.55 ± 0.03*	0.46 ± 0.02*	0.45 ± 0.01*
			Leaf
Lignin	87.9 ± 2.89	100.1 ± 1.7*	100.9 ± 1.9*	102.2 ± 0.9*
H	0.29 ± 0.02	0.25 ± 0.01	0.90 ± 0.02*	0.82 ± 0.09*
G	0.33 ± 0.02	0.39 ± 0.01	0.57 ± 0.02*	0.79 ± 0.04*
S	0.40 ± 0.03	0.39 ± 0.01	0.53 ± 0.03*	0.53 ± 0.03*
H + G + S	1.02 ± 0.04	1.03 ± 0.02	2.00 ± 0.06*	2.14 ± 0.19*
H : G : S ratio	29 : 32 : 39	24 : 38 : 38	45: 29 : 26	38 : 37 : 25
S/G ratio	1.24 ± 0.14	1.00 ± 0.01	0.93 ± 0.06*	0.67 ± 0.01*

H, p-hydroxyphenyl; G, guaiacyl; and S, syringyl monomers. Results are expressed as mg monomer g⁻¹ cell wall. Values (N = 4 ± SE) significantly different from the control (P ≤ 0.05, Dunnett's multiple comparison test) are marked with asterisk (*).