Effects of glucose on the uptake and metabolism of glycine in pakchoi (Brassica chinensis L.) exposed to various nitrogen sources

Table 1 Effects of glucose on the activity of N metabolic enzymes in pakchoi

Glucose concentration (μM)	GPT (μmol · g-1 · 30 min)		GOT (μmol · g-1 · 30 min)		GS (A · mg-1 protein · h-1)
Glucose concentration (μM)	shoot	root	shoot	root	shoot	root
0	3.8 ± 0.4a	7.8 ± 1.5a	9.8 ± 0.2ab	12.5 ± 0.2a	19.1 ± 0.7a	23.5 ± 0.6a
4.5	5.7 ± 1.3a	5.7 ± 0.8ab	10.3 ± 0.1a	11.9 ± 0.5a	19.9 ± 0.2a	24.5 ± 2.9a
500	5.9 ± 0.6a	3.9 ± 0.5b	9.6 ± 0.2b	11.2 ± 0.3a	21.3 ± 1.8a	23.4 ± 0.9a
0	4.5 ± 0.9a	5.2 ± 2.7a	12.1 ± 0.2a	13.8 ± 0.4a	19.2 ± 0.4b	24.7 ± 1.0a
25	5.1 ± 0.5a	6.3 ± 1.8a	10.5 ± 0.2b	13.2 ± 0.3a	23.0 ± 0.8a	24.0 ± 0.9a
500	5.9 ± 1.2a	7.2 ± 0.8a	10.2 ± 0.1b	13.1 ± 0.1a	20.7 ± 0.5b	20.5 ± 0.5b

Values represent the mean ± SE (n = 3). Different letters in each column indicate significant differences between treatments at p < 0.05. The first three rows represent the enzymes under conditions where glycine was supplied as a single N source, and the last three rows represent the enzymes under conditions where glycine was supplied in a mixed N source

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