三个不同海拔梯度马尾松种群的遗传多样性及其与生态因子的相关性

摘要

High genetic diversity was found in these populations,and the sum of SSD was 8164.Genetic diversity in three Pinus massoniana populations of different elevation was determined by means of RAPD and they were 7.48,7.40,7.03.The differentiation level among populations was low.Less than 2% of genetic diversity was attributed to the differentiation among the populations while more than 97% resided within the different populations.Correlation analysis shows a significant relation between genetic diversity and total nitrogen(P<0.05),and no significant relation was observed between genetic diversity and other ecological factors.Thought the genetic distance among the populations was very small,there was a significant relation between it and the distance of elevation.%采用RAPD技术分析测定了3个马尾松海拔梯度种群的分子遗传特征。马尾松种群中遗传多样性较高，AMOVA软件分析Euclidean系数SSD总和达8164.116；L1、L2、L3三个种群的遗传多样性分别为7.4832、7.4011、7.0332；种群间的分化程度较低，大部分变异存在于种群内(约≥97%)，种群间仅占一小部分(约≤2%)；相关性分析表明种群的遗传多样性与土壤的总氮量呈显著负相关性(P＜0.05)，而与其它生态因子相关关系不显著；虽然种群间遗传距离值均很低(L1～L2、L2～L3、L1～L3分别为-0.0002、0.0001、0.0051)，但其值与海拔差距呈显著正相关性。