南亚热带森林优势种群荷木和锥栗在演替系列群落中的分子生态研究(英文)

Molecular Ecology of Lower Subtropical Species, Schima superba and Castanopsis chinensis in Three Succession Series Communities

用扩增片段长度多态性 (AFLP ,amplifiedfragmentlengthpolymorphism)方法研究了荷木 (SchimasuperbaGardn .etChamp .)和锥栗 (CastanopsischinensisHance .)在 3个演替系列群落中的分子变化。研究地点位于广东省鼎湖山。 3个群落是针叶林群落、针阔叶混交林群落和常绿阔叶林群落。荷木的AFLP分析结果表明 ,4组引物对分别扩增出2 4、40、2 7、2 7条带 ,其中分别有 15、2 3、2 3、16条是多样性带 ;锥栗的AFLP分析结果表明同样的 4组引物对分别扩增出 2 7、2 0、33、39条带 ,其中分别有 12、5、15、13条是多样性带。平均杂合度表明荷木比锥栗有更大的分子变异。用AMOVA(analysisofmolecularvariance)分析表明荷木种群有 95 .99%的分子分化表现在种群内 ,4.0 1%的分子分化表现在种群间 ,表现极显著 (P <0 .0 0 1) ;锥栗种群有 75 .36 %的分子分化表现在种群内 ,2 4.6 4%的分子分化表现在种群间 ,极显著 (P <0 .0 0 1)。除趋势面对应分析表明荷木来自不同群落的个体分布没有规律 ,而锥栗来自不同群落的个体大致分布在一起。上述结果的产生是两个不同种群的生物学特性的反映 ,并提示了不同群落微环境对种群分化的影响 ,以及与森林演替群落的相关性。

Amplified fragment length polymorphism(AFLP)was used to analyze 2 populations: Schima superba Gardn. et Champ. and Castanopsis chinensis Hance. across three different communities representing three succession stages, in Dinghu Mountain, China. These two were middle succession species in the lower subtropical broad_leaved forest. Four AFLP primer combinations using total 48 individuals of S. superba provided 24, 40, 27 and 27 reliable bands, of which 15, 23, 23 and 16 were polymorphic, respectively. Similarly, total 48 individuals of C. chinensis provided 27, 20, 33 and 39 reliable bands, of which 12, 5, 15 and 13 were polymorphic respectively. These bands were used as presence/absence data to assess the levels of genetic variation and population structure of those species. From average heterozygosity, S. superba possessed higher molecular variation than C. chinensis . Analysis of molecular variance(AMOVA)indicated that most of the genetic variation of S. superba was due to the differences within population(95.99%, P <0.001), with 4.01% ( P <0.001)genetic variation among population. Similarly, AMOVA indicated the most of the genetic variation of C. chinensis was due to the differences within population(75.36%, P <0.001), with 24.64%( P <0.001)genetic variation among communities(24.64%). DCA(Detrended Correspondence Analysis) analysis showed that the individuals of S. superba from the same community did not cluster together, while the individuals of C. chinensis from the same community roughly cluster together. The above results reflected the biological characteristics of the two different species suggesting the significant effect of microenvironment of different community on population differentiation and its relationship of which to forest succession resulted in genetic divergence.