The reaction protocol for the randomly amplified polymorphism DNA analysis for Torreya grandis is optimized, with the 20 μl reaction system containing 50 ng template, 1.5μl 10 x buffer, 1 U Taq DNA polymerase, 2.4 mmol/L MgCl 2, 240 μmol/L dNTPs, and 0.84 μmol/L primer. The PCR amplification program is 3 min denaturation at 95 ℃ for 1 cycle; 30 s denaturation at 94 ℃, 30 s annealing at 36 ℃, 60 s extension at 72 ℃ for 35 cycles; and 5 min final extension at 72 ℃. This reaction system demonstrated a high repro...