紫丁香表型多样性研究  被引量:66

Phenotypic Variation of Syringa oblata Lindl.

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作  者:明军[1] 顾万春[2] 

机构地区:[1]中国农业科学研究院蔬菜花卉研究所,北京100081 [2]中国林业科学研究院林业研究所,北京100091

出  处:《林业科学研究》2006年第2期199-204,共6页Forest Research

基  金:"十五"国家攻关"林木种质资源保存技术创新与利用研究"(2001BA511B10);国家重大基础性工作项目"林木种质资源收集;保存;编目"(2001DEA10002)

摘  要:以紫丁香天然林分布区抽取的4个天然群体和1个栽培群体为拟似群体,进行了其表型多样性分析。结果表明:紫丁香表型性状存在着丰富的群体间、群体内变异,5个群体的果、种子、叶以及子代幼苗等14个表型性状差异显著,变异系数为14.25%~29.13%,表型性状分化系数为1.85%~86.67%,平均值为43.93%;群体间和群体内的差异均极显著,群体内的方差分量为56.06%,其中有10个种实性状与生态梯度值呈显著或极显著的相关,采用Diat平均分类距离系数的聚类分析得到的群体间的遗传距离关系基本上与群体采种点的生态地理位置关系一致,其中山西五老峰群体独立为一组,北部三个群体聚为一组,栽培群体聚入了北部群体组,并且与辽宁北票群体较近。依据研究结果,紫丁香种质资源收集、保护策略应当是:基于表型分化系数群体间平均值达到较高水平,而群体内保留了种质的大部分变异,所以在分布区内应首先保护天然群体的存在,即尽可能多的群体数量,同时,要很好保护天然群体的完整性。育种亲本的选择策略应当是:在群体内收集、选择特异变异的同时,加强多群体的收集和选择。Syringa oblata Lindl. is a native deciduous shrub species in China' s temperate regiona. Genetic resources of the species has been seriously degraded, remaining few scattered distributions. 4 natural populations and 1 cultivated populaogical markers. Morphological diversity were analyzed based on 14 phenotypic traits, including three capsule c ling traits, of 30 sample trees from each population. Variance analysis within populations. The coefficient of variation (CV) was 14.25% to haracters, two foliage among and within populations traits, five seed and four seedshowed that there were significant variation among/ 29.13%, and phenotypic differentiation coefficient (Vst) ranged from 1.85% to 86.67%, the mean value of 5 populations was 43.93%. The variation within the main part of the phenotypic variation, variance component of within population variance was 56.06%. population was There is close relationship between the 10 phenotypic traits and ecological gradient variation in spatial distribution. Cluster analysis based on average taxonomic distance (Dist) of morphological traitsshowed that the 5 populations of Syringa oblata were divided into two groups and that the cultivated population was clustered into northern group. According to the research result, the lilac germplasm resources collections and protection strategy should be focused on protecting more populations as many as possible. On the other hand, integrality is also important. A selective breeding strategy should be employed not only selecting genetic variation within but also among populations.

关 键 词:紫丁香 天然群体 表型标记 遗传多样性 

分 类 号:S722.3[农业科学—林木遗传育种]

 

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