Odat Nidal, Jetschke Gottfried, Hellwig Frank H
Institut für Okologie, Friedrich-Schiller-Universität Jena, Dornburger Strasse 159, D-07743 Jena, Germany.
Mol Ecol. 2004 May;13(5):1251-7. doi: 10.1111/j.1365-294X.2004.02115.x.
Correlates between genetic diversity at intra- and interpopulation levels and the species diversity in plant communities are rarely investigated. Such correlates may give insights into the effect of local selective forces across different communities on the genetic diversity of local plant populations. This study has employed amplified fragment length polymorphism to assess the genetic diversity within and between 10 populations of Ranunculus acris in relation to the species diversity (richness and evenness) of grassland communities of two different habitat types, 'seminatural' and 'agriculturally improved', located in central Germany. Within-population genetic diversity estimated by Nei's unbiased gene diversity (HE) was high (0.258-0.334), and was not correlated with species richness (Pearson's r = -0.17; P = 0.64) or species evenness (Pearson's r = 0.15; P = 0.68) of the plant communities. However, the genetic differentiation between R. acris populations was significantly correlated with the difference in species evenness (Mantel's r = 0.62, P = 0.02), but not with difference in species richness of plant communities (r = -0.17, P = 0.22). Moreover, we also found that populations of R. acris from the 'seminatural' habitat were genetically different (amova, P < 0.05) from those in 'agriculturally improved' habitats, suggesting that gene flow between these habitat types is limited. The results reported in this study may indicate that habitat characteristics influence the genetic diversity of plant species.
很少有人研究植物种群内和种群间的遗传多样性与植物群落物种多样性之间的相关性。这种相关性可能有助于深入了解不同群落中的局部选择力对当地植物种群遗传多样性的影响。本研究采用扩增片段长度多态性方法，评估了德国中部两种不同生境类型（“半自然”和“农业改良”）的草原群落中，10个毛茛种群内和种群间的遗传多样性，以及物种多样性（丰富度和均匀度）。通过Nei氏无偏基因多样性（HE）估计的种群内遗传多样性较高（0.258 - 0.334），且与植物群落的物种丰富度（Pearson氏r = -0.17；P = 0.64）或物种均匀度（Pearson氏r = 0.15；P = 0.68）均无相关性。然而，毛茛种群之间的遗传分化与物种均匀度的差异显著相关（Mantel氏r = 0.62，P = 0.02），但与植物群落物种丰富度的差异无关（r = -0.17，P = 0.22）。此外，我们还发现，来自“半自然”生境的毛茛种群与“农业改良”生境的种群在遗传上存在差异（方差分析，P < 0.05），这表明这些生境类型之间的基因流动是有限的。本研究报告的结果可能表明，生境特征会影响植物物种的遗传多样性。
