Differential contributions of NO3−/NH4+ to nitrogen use in response to a variable inorganic nitrogen supply in plantlets of two Brassicaceae species in vitro

Table 2 The chlorophyll concentration of the Ov and Bn plantlets cultured under different inorganic nitrogen concentrations

Parameters	Plant species	Inorganic nitrogen concentration (mM)
Parameters	Plant species	20	40	60	80
chl a (mg/g)	Ov	0.59 ± 0.04a	0.70 ± 0.10a	0.75 ± 0.09a	0.79 ± 0.10a
chl a (mg/g)	Bn	0.50 ± 0.05b	0.53 ± 0.06b	0.70 ± 0.03a	0.78 ± 0.08a
chl b (mg/g)	Ov	0.30 ± 0.04b	0.35 ± 0.02ab	0.37 ± 0.05ab	0.40 ± 0.03a
chl b (mg/g)	Bn	0.17 ± 0.03b	0.19 ± 0.02b	0.22 ± 0.03ab	0.28 ± 0.03a
chl a + b (mg/g)	Ov	0.89 ± 0.06b	1.05 ± 0.09ab	1.12 ± 0.13ab	1.19 ± 0.11a
chl a + b (mg/g)	Bn	0.67 ± 0.07c	0.72 ± 0.08bc	0.92 ± 0.06ab	1.05 ± 0.11a

Ov-Orychophragmus violaceus, Bn-Brassica napus. The ratio of nitrate to ammonium within each inorganic nitrogen concentration was 2:1. Each value represents the mean ± SD (n = 3). Values signed with the same letter in each line are not significantly different by Tukey’s test (p > 0.05)

ISSN: 1746-4811