Our results also revealed that the infection and colonization of endophytic strain ND35 increased host endogenous hormones content such as IAA, GA, zeatin (ZT), SA, and JA and up-regulation of genes expressions related to those hormones, and the endogenous hormone changes may increase lignin content and the activity of key biosynthetic enzymes, such as PAL, 4CL, CAD and POD. Here, CAD is linked to infection.