Table 1.

Thirty of the selected metabolites with a VIP > 1 and a |p (corr)| > 0.6 as responding biomarkers from the nitrate-deprived group vs. the control group.

Number	Identified Metabolites	VIP	p[1]	p(corr)[1]	Change Rate in Abundance, % (N Deprivation vs. the Control)
1	Linolenic acid	5.48	0.22	0.65	5.13
2	α-Ketoglutaric acid	3.24	0.28	0.94	−55.11
3	Stearic acid	2.60	−0.20	−0.88	67.15
4	Putrescine	2.48	0.24	0.97	−29.31
5	Glutamine	2.42	0.22	0.95	−21.44
6	Asparagine	2.33	0.20	0.93	−58.90
7	Palmitic acid	2.01	−0.20	−0.97	67.00
8	Uracil	1.92	0.20	0.99	−11.27
9	Adenosine	1.87	0.16	0.93	−28.98
10	Glutamic acid	1.86	0.18	0.97	−35.24
11	Nicotinamide	1.75	0.19	0.99	−8.17
12	Adenine	1.74	0.17	0.96	−30.60
13	Succinic acid	1.71	0.17	0.94	8.36
14	Valine	1.65	0.17	0.99	−6.68
15	Isoleucine	1.61	−0.10	−0.80	75.65
16	Trisaccharide	1.59	0.17	1.00	−2.16
17	Citric acid	1.52	0.13	0.91	−33.14
18	Pentadecanoic acid	1.45	−0.13	−0.95	75.54
19	Alanine	1.43	0.15	0.98	−56.06
20	Malic acid	1.41	0.15	0.99	−11.30
21	Fumaric acid	1.36	0.13	0.94	−34.74
22	Aspartic acid	1.35	0.11	0.92	−5.22
23	Proline	1.34	0.13	0.97	−1.03
24	Serine	1.30	0.11	0.93	−9.06
25	Phenylalanine	1.19	0.12	0.97	−29.42
26	Histidine	1.13	−0.12	−0.99	86.94
27	Tryptophan	1.11	−0.12	−1.00	85.84
28	Shikimic acid	1.11	0.12	1.00	−35.76
29	Leucine	1.09	0.11	0.97	−27.64
30	Lysine	1.01	0.11	0.99	−4.38

VIP: variable influence on the projection; p[1]: the loading of the first predictive component to explain the largest variation; p(corr)[1]: the correlation coefficient between the metabolite and the score of the first predictive component to explain the largest variation; N: nitrogen.