晒黄烟种质资源遗传多样性分析与评价

为加强晒黄烟资源的收集保存与利用,本研究对来源于国家烟草中期库的6份晒黄烟和新收集的26份晒黄烟进行了SSR分子标记研究,根据来源不同将32份种质分成Z(资源库)、G(广西贺州)以及M(广西百色)3个群体。结果表明,(1)106对SSR引物共检测到110个位点,其中85个为多态性位点,多态性比率为77.27%,种质间的遗传相似系数变异范围为0.49~0.95,表明种质间遗传基础比较狭窄。(2)3个群体内遗传差异由大到小分别为:ZMG。Z与M的遗传相似系数为0.7762,遗传距离相对较远,G与M遗传相似系数为0.8963,遗传距离较近。(3)在相似系数0.49处可将32份种质分成2类,第1类包括寸三皮和大宁旱烟籽,第2类包括3个亚类,其中来源于Z群体的公会晒烟与新收集晒黄烟品种(系)归为一类,Z群体的其他种质与新收集种质遗传距离较远。(4)来自不同地点的同名种质大宁烟遗传距离相对较远,相似系数为0.788。不同名称的公会包盖烟和凤凰黄烟遗传相似性最高,相似系数为0.939。     

The Distribution of Heavy Metals in Urban Street Dusts of Karak City,Jordan

Street dust samples from urban and suburban areas were collected from the city of Karak, Jordan, during the summer season of 2004. Samples were analyzed for their heavy metal concentrations (Pb, Cu, Zn, Ni, Fe, Cr, Cd, and Mn). The results showed that all heavy metals are higher in city urban areas than the surrounding suburbs. The distribution and concentrations of heavy metals in all areas show automobile originated sources such as emissions and wear and tear of automobiles were the main source of pollution. Despite the fact that the city of Karak and the capital Amman are under the same climatic conditions and same type of fuel used in both cities, the heavy metal concentrations of street dust samples were lower in Karak than Amman due to the lower traffic density.