Though the average yield(373 ug/g) and purity(A_(260)/A_(280) between 1.54~1.92) of DNA extracted from dried buds were fewer than the DNA extracted from young buds,but the bands of RAPD-PCR amplified DNA were all clear,stable,bright and complete.

• 尽管干叶提取的DNA的平均产率(373 ug/g)和纯度(A260/A280比值为1.；54~1