Results show that the psbA-trnH fragment is highly conservative at intraspecific level and obvious diversity at interspecific level, however, phylogenetic study is necessary for the Dioscorea in the future.

• 所得结果显示psbA-trnH片段序列在所研究的三种薯蓣种内保守,在种间具有明显的较大差异,而三种薯蓣及薯蓣属的系统发生关系尚须进一步研究。