NaCl胁迫对膜荚黄芪种子萌发和幼苗生理特性的影响

目的 对壮药战骨种质资源的遗传多样性进行研究.方法 采用ISSR分子标记技术分析9个战骨种群的遗传多样性.结果 13条引物共检测到73个位点,其中65个位点具有多态性,多态位点百分率(PPL)为89.04％.战骨总的Nei’s基因多样度指数(H)为0.226 5,Shannon's多样性信息指数(I)为0.357 2,各种群的平均H、I为0.147 6、0.221 9.种群间基因分化系数(Gst)为0.348 4,基因流(Nm)为0.935 1.9个种群可聚类划分为2个大种群组.结论 战骨种群遗传多样性为中等偏低水平;战骨种群的遗传变异主要存在于种群内;战骨的生物学特性和分布区域的片段化是导致种群间出现一定的遗传分化和种群遗传多样性较低的主要原因.

Effects of NaCl stress on seed germination and seedling physiological characteristics of Astraglus membranaceus

Objective To investigate the genetic diversity for germplasm resources of Premna fulva in Zhuang medicine.Methods The genetic diversity of the nine populations of P.fulva was analyzed by ISSR molecular markers.Results Thirteen primers produced 73 sites,among which 65 were polymorphic sites and Nei’s genetic diversity index(H) and Shannon’s information index(I) were 0.226 5 and 0.357 2,respectively,while average H and I at population level were 0.147 6 and 0.221 9.Genetic differentiation coefficient(Gst) and gene flow(Nm) were 0.348 4 and 0.935 1 within the population levels.Cluster analysis indicated that the nine populations could be divided into two groups.Conclusion The genetic diversity among the populations of P.fulva is at lower-middle level.The genetic variance of P.fulva mainly exists among the populations.The high genetic variance among the populations and the low genetic diversity within populations could be attributed to the biological characteristics of P.fulva and its region segment.