利用5个DNA片段及12个微卫星标记(SSR)对姜状三七(Panax zingiberensis C.Y.Wu et K.W.Feng)的遗传多样性和遗传分化进行分析。结果显示,与其他人参属(Panax)植物相比:姜状三七具有相对较高物种水平的核苷酸多态性和等位基因数;在居群水平上,景谷居群具有最高的核苷酸多态性和等位基因数,而江城居群最低。AMOVA分析结果表明,姜状三七在物种水平上具有一定程度的遗传分化,但不显著;在居群水平,江城居群与其他居群间的分化程度最高,其他居群间遗传分化不明显。Structure分析结果也显示江城居群与其他居群被聚类到不同分组,且形态特征相近的样本并未聚到一起,同一分布点的样本遗传成分更相似。
In this paper,Psammosilene tunicoides,an endemic species to China,was cytologically studied for the first time.The morphology of the nuclei at resting stage was categorized to be simple chromocentre type.The morphology of mitotic-prophase chromosomes was categorized to be the interstitial type.28 chromosomes were observed at the mitotic metaphase,and 14 bivalent chromosomes were observed at diakinesis.So,the basic chromosome number was confirmed to be x=14.Psammosilene tunicoides is different from Silene rubicunda in the basic chromosome number and the morphology of the nuclei at resting stage and mitotic-prophase chromosomes,because Silene rubicund has the basic chromosome number of x=10 and 12,and its nuclei at resting stage and mitotic-prophase chromosomes is sparsely diffuse type and continuous type respectivrly.
