Fig. 6

Lignin-related pathway in P. grandifloras under different salt stress treatments. (a) The proposed metabolic pathway is based on KEGG pathway map: Ko00940 Phenylpropanoid biosynthesis (http://www.kegg.jp/kegg/kegg1.html). The metabolites in red color were the differentially abundant metabolites detected in this study. Metabolites in black color were not detected. The red italics and small icons represent genes, whereas purple color represents downregulation and red represents upregulation; (b) Salt-induced lignin concentration relatively changed compared with the control