Table I.

Chain length distribution of soybean root aliphatics by substance class

Epidermal and endodermal tissues were isolated from state I (0–70 mm from root tip) and state II (90–160 mm from root tip) roots of two soybean genotypes and subjected to BF₃/MeOH transesterification and GC analysis (see “Materials and Methods”). Values (μg cm⁻² ± se) are the average of two replicate experiments (with three analyses per experiment).

Substance Class	Chain Length	Epidermis				Endodermis
		‘Conrad’		OX760-6		‘Conrad’		OX760-6
		0–70 mm	90–160 mm	0–70 mm	90–160 mm	0–70 mm	90–160 mm	0–70 mm	90–160 mm
Fatty acids	16:1	0.05 ± 0.01	0.21 ± 0.02	0.16 ± 0.01	0.05 ± 0.01	0.53 ± 0.01	0.82 ± 0.01	0.17 ± 0.03	0.39 ± 0.01
	16:0	0.14 ± 0.01	0.39 ± 0.04	0.01 ± 0.01	0.25 ± 0.01	0.40 ± 0.03	1.50 ± 0.01	0.29 ± 0.06	0.72 ± 0.05
	18:1	0.19 ± 0.01	0.71 ± 0.01	0.04 ± 0.001	0.18 ± 0.01	2.60 ± 0.18	7.46 ± 0.04	0.15 ± 0.04	1.46 ± 0.21
	18:0	0.05 ± 0.01	0.32 ± 0.11	0.012 ± 0.01	0.04 ± 0.01	0.32 ± 0.01	0.83 ± 0.01	0.10 ± 0.01	0.30 ± 0.01
	20:0	0.01 ± 0.01	0.05 ± 0.01	0.007 ± 0.01	0.03 ± 0.01	0.07 ± 0.03	0.28 ± 0.01	0.03 ± 0.01	0.49 ± 0.04
	22:0	0.03 ± 0.01	0.09 ± 0.02	0.01 ± 0.01	0.04 ± 0.01	0.16 ± 0.05	0.31 ± 0.01	0.04 ± 0.01	0.31 ± 0.01
	Total	0.47 ± 0.02	1.77 ± 0.20	0.24 ± 0.004	0.59 ± 0.01	4.08 ± 0.13	11.20 ± 0.06	0.78 ± 0.01	3.67 ± 0.21
ω-Hydroxy fatty acids	16:0	0.44 ± 0.01	0.83 ± 0.02	0.22 ± 0.01	0.52 ± 0.02	1.58 ± 0.27	2.10 ± 0.04	0.44 ± 0.05	1.58 ± 0.06
	18:1	0.51 ± 0.01	1.08 ± 0.04	0.26 ± 0.01	0.62 ± 0.02	2.19 ± 0.59	3.73 ± 0.04	1.07 ± 0.05	2.86 ± 0.09
	20:0	0.52 ± 0.01	0.92 ± 0.02	0.35 ± 0.09	0.58 ± 0.008	1.49 ± 0.02	1.56 ± 0.02	0.45 ± 0.01	1.05 ± 0.03
	22:0	0.55 ± 0.01	1.02 ± 0.02	0.08 ± 0.02	0.13 ± 0.003	1.86 ± 0.21	2.12 ± 0.08	0.11 ± 0.01	0.38 ± 0.01
	24:0	0.67 ± 0.01	1.19 ± 0.01	0.32 ± 0.02	0.77 ± 0.03	2.13 ± 0.07	3.10 ± 0.58	0.57 ± 0.06	1.40 ± 0.03
	Total	2.69 ± 0.01	5.04 ± 0.11	1.23 ± 0.03	2.61 ± 0.04	9.25 ± 0.06	12.61 ± 0.60	2.64 ± 0.06	7.27 ± 0.15
Dioic acids	16:0	0.02 ± 0.01	0.05 ± 0.01	0.02 ± 0.01	0.03 ± 0.01	0.06 ± 0.01	0.30 ± 0.04	0.04 ± 0.02	0.29 ± 0.02
	18:1	0.01 ± 0.01	0.04 ± 0.02	0.04 ± 0.03	0.03 ± 0.01	0.04 ± 0.01	0.34 ± 0.01	0.03 ± 0.02	0.34 ± 0.01
	20:0	0.01 ± 0.01	0.02 ± 0.01	0.01 ± 0.01	0.01 ± 0.01	0.06 ± 0.03	0.12 ± 0.01	0.01 ± 0.01	0.09 ± 0.01
	Total	0.04 ± 0.01	0.11 ± 0.03	0.08 ± 0.001	0.07 ± 0.01	0.16 ± 0.02	0.76 ± 0.04	0.08 ± 0.01	0.72 ± 0.06
1-Alkanols	20:0	–	–	–	–	–	0.03 ± 0.01	–	0.02 ± 0.01
	Total	–	–	–	–	–	0.03 ± 0.01	–	0.02 ± 0.01
Overall Total		3.2 ± 0.006	6.92 ± 0.34	1.55 ± 0.003	3.27 ± 0.03	13.5 ± 0.42	24.6 ± 0.69	3.51 ± 0.10	11.68 ± 0.43