Ammopiptanthus mongolicus (Leguminosae) were s ubjected to ISSR (Inter-simple sequence repeat)-PCR analysis in order to inv esti gate the genetic diversity within and among populations. Genomic DNA of A . m ongolicus was extracted as the ISSR template, and the influencing facto rs of ISSR were studied and the experiment parameters were optimized. By adjusti ng template DNA concentration, Mg2+ concentration,dNTP and Taq polymera se conte nts, and annealing temperature, the PCR amplification conditions we...