Fig. 5
The contents of some metabolites associated with TCA metabolic pathway in P. notoginseng roots under different forms of nitrogen treatments. All values shown are mean values ± standard errors (S.E.). The asterisks indicate significant differences compared with the 15A treatment under the same treatment conditions (Student’s t-test). Standard deviations were calculated from three technical replicates. The results shown were reproduced with three biological replicates. * represents P-values <0.05; ** represents P-values <0.01; *** represents P-values <0.001. a Effects of the different forms of nitrogen treatments on changes of organic acids in TCA cycle of P. notoginseng. b The changes of organic acid synthases in TCA cycle. c The changes of major sugar compounds in TCA cycle. d The NH 4 + content in TCA cycle