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. 2018 Feb 22;9:217. doi: 10.3389/fpls.2018.00217

Table 1.

Metabolites had similar variation pattern with REC in responded to N4 and R3.

Metabolites	Tissue	Relative abundance^a
		ST	N4	R3	N4/ST	R3/ST	R3/N4
Urea	Root	29.28 ± 6.23	59.48 ± 6.48	102.15 ± 19.01	2.03^**	3.49^**	1.72^*
Leucine	Root	35.33 ± 5.28	80.82 ± 4.42	135.02 ± 24.01	2.29^**	3.82^**	1.67^*
Uridine	Root	ND^b	9.81 ± 0.99	41.57 ± 14.36	–	–	4.24^*
Histidine	Root	ND	34.07 ± 7.13	153.69 ± 25.74	–	–	4.51^**
L-Malic acid	Shoot	406.96 ± 20.5	95.57 ± 13.53	61.02 ± 8.06	0.23^**	0.15^**	0.64^*
4-Hydroxybutyrate	Shoot	1.82 ± 0.17	0.83 ± 0.07	0.49 ± 0.06	0.46^**	0.27^**	0.59^**
Quinic acid	Shoot	111.14 ± 17.02	56.51 ± 10.89	29.92 ± 4.25	0.51^*	0.27^**	0.53^*
Sedoheptulose	Shoot	3.15 ± 0.24	5.58 ± 0.26	9.17 ± 0.44	1.77^**	2.91^**	1.64^**
Caffeic acid	Shoot	1.29 ± 0.25	2.38 ± 0.37	4.12 ± 0.26	1.84^*	3.18^**	1.73^**

^a

Relative abundance of metabolites in ST, N4, and R3 conditions and N4/ST, R3/ST, and R3/N4.

^b

ND, undetected.

^{*, **}

mean significant difference by student's t-test with p < 0.05 and p < 0.01, respectively.