Ghesmati,M. , , Taheri,H. , , Meratan,A. A. , and Pour Mohamadi,P. . "Cell Wall Extract from Piriformospora indica Enhances Valerenic Acid Content in Valerian Roots via Modulating Sesquiterepene Synthase Genes", Journal of Applied Biotechnology Reports, 4, 3, 2017, 645-650.