Effects of nutrient deficiency on principal components of ginseng root exudates

By the method of solution culture,the effects of N,P,and K deficiency on the principol components in root exudates of ginseng at its early growth stage were studied.The results showed that in treatments N and K deficiency and control,no significant difference was observed in the principal components of ginseng root exudates,and 28,29,and 27 principal chromatographic peaks were detected by GC-MS,respectively;while in treatment P deficiency,only 22 principal chromatographic peaks were detected.Furthermore compounds in the root exudates from treatments N,P,and K deficiency and control were identified,respectively.Compared with control,treatments N and K deficiency had more kinds of organic acids and phenolic acids in root exudates,while treatment P deficiency was in adverse,which suggested that at early growth stages,ginseng had more requirement to N and K than P,and N and K deficiency would accelerate the exudation of organic acids and phenolic acids by roots.