TABLE 3.

Free amino acid and ammonia content of RIL 37 exudate, Wisconsin 55 exudate, and the 12-amino-acid mixture^a

Amino acid or ammonia	RIL 37		Wisconsin 55		1× Amino acid mixture
	μM	Mol%	μM	Mol%	mM	Mol%
l-Aspartic acid	0.24	7.6	2.52	5.5	0.013	0.1
l-Threonine	0.09	2.6	2.82	5.6	0.024	0.2
l-Serine	0.18	4.5	2.40	4.1	0.022	0.2
l-Asparagine	ND	ND	1.80	3.9	1.19	11.1
l-Glutamic acid	0.27	9.6	3.24	7.9	ND	ND
l-Glutamine	0.21	7.3	2.10	5.0	0.60	6.2
l-Proline	ND	ND	1.68	3.2	0.88	7.1
l-Glycine	0.63	11.3	2.10	2.6	1.93	10.2
l-Alanine	0.27	5.7	3.39	5.1	ND	ND
l-Valine	ND	ND	0.27	0.6	ND	ND
l-Cysteine	ND	ND	0.06	0.2	0.19	3.2
l-Methionine	ND	ND	ND	ND	0.82	8.6
l-Isoleucine	0.03	0.9	1.77	3.8	1.08	10.0
l-Leucine	0.03	0.9	3.09	6.6	ND	ND
l-Tyrosine	0.03	1.3	1.11	3.4	0.55	7.0
l-Phenylalanine	0.09	3.5	1.77	4.8	0.85	9.9
l-Tryptophan	ND	ND	ND	ND	0.67	9.6
Ammonia	6.30	25.6	95.04	26.5	0.25	0.3
l-Lysine	0.12	4.2	1.77	4.2	0.003	0.0
l-Histidine	ND	ND	0.42	1.1	0.70	7.6
l-Arginine	0.36	15	2.07	5.9	0.71	8.8

^aAnalysis was performed by Scientific Research Consortium (St. Paul, Minn.) on a Beckman Instruments model 6300 dedicated amino acid analyzer. ND, none detected.