2.1　Fungal strains

The endophytic fungi P.polonicum hy4 and C.gloeosporioides Cg01 that produces Hup A were isolated and screened from H.serrata，which collected from Nanping，Fujian，China.Two strains were purified by single-spore isolation and identified by ITS sequencing.The strains were cultured on Potato Dextrose Agar medium at 28℃and deposited at the China Center for Type Culture Collection(hy4：CCTCC No.M2010086，Cg01：CCTCC No.AF2018024；Wuhan，China).

Colony of P.polonicum hy4 on PDA was cyan，wrinkled，good sporulation，margin slightly irregular，reverse light brown(Figure 2).Colony of C.gloeosporioides Cg01 grown from single conidia on PDA about 8 cm diam after 5 d，aerial mycelium sparse，white，or grey-white，surface of colony with numerous acervuli，some with dark bases，with orange conidial ooze(Figure 2).(https://www.daowen.com)

Figure 2　Morphology of P.polonicum hy4(A)and C.gloeosporioides Cg01(B)on potato dextrose agar