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野生榆叶梅种质资源遗传多样性研究
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摘要
榆叶梅(Prunus triloba Lindl.)为蔷薇科李属落叶观花灌木或小乔木,是我国著名的传统花木,主要分布于东北、华北和西北地区。榆叶梅栽培历史悠久、品种丰富,广泛应用于园林绿化,是中国北方地区重要的早春观花树种。
     关于榆叶梅的研究主要集中在繁殖栽培及品种分类,对于野生榆叶梅资源的系统研究较少。榆叶梅为八倍体植物(2n=8x=64),在自然分布中,适应性强,变异类型丰富。本研究是在对野生榆叶梅的分布进行了调查的基础上,重点对河北、北京和辽宁三个有代表性省市区域的野生居群进行了研究,旨在探索野生榆叶梅的遗传多样性状况,分析其丰富变异的原因;同时根据其变异特点开展野生榆叶梅资源的引种工作,为榆叶梅选育利用和相关基础研究奠定基础。具体结果如下:
     1明确了我国野生榆叶梅的资源状况,详细调查了位于辽宁、河北、北京等地的野生榆叶梅分布状况,并选择代表性居群进行了研究和取样。在自然条件下,野生榆叶梅常在坡势较缓的区域集中形成大面积居群,多沿山谷两侧分布,山脊较少;居群中常伴生有山桃、山杏等树种,以山桃居多;而居群边缘则有更多的山桃、山杏等沿路分布。作为野生的蔷薇科高倍性植物,遗传背景比较复杂。
     2对榆叶梅6个野生居群的表型性状进行了研究,方差分析结果表明:榆叶梅野生居群性状在居群间和居群内存在广泛的变异。居群内只有少数几个性状间差异显著,其中居群内的方差分量较大,为28.21%,说明居群内变异是榆叶梅野生群体变异的主要来源。因此榆叶梅今后的遗传改良工作应重视增加居群内的抽样数,即在居群内进行优良单株的选择是至关重要的。
     3对榆叶梅6个野生居群的表型性状聚类分析结果表明:6个野生居群可划分为两类,且表型性状并没有依据地理距离而聚类,居群间表型变异表现为不连续的。主成分分析结果表明前6个主成分的累计贡献率仅达到57.33%,可以代表原始性状的部分信息。因此在进行榆叶梅种质资源保存工作时,居群的完整性相当重要。
     4利用AFLP分子标记技术,对野生榆叶梅6个居群进行了分析。6个居群观察等位基因数Na平均值为1.5026,总Na值为1.8047;有效等位基因数Ne平均值为1.2165,总Ne值为1.2458;遗传多样性指数H平均值为0.1355,总H值为0.1567;Shannon多样性指数I平均值为0.2134,总I值为0.2554;结果表明:野生榆叶梅6个居群有86.47%的遗传变异来自居群内,13.53%来自居群间,居群内遗传分化水平较高。共筛选出的8对适合于野生榆叶梅AFLP研究的引物组合并进行扩增,共产生256条谱带,其中206条谱带具有遗传多态性,占总谱带的80.47%;平均每对引物组合扩增产生129条多态条带,平均多态率为50.26%。
     5利用芽尖细胞对北京响水湖居群的野生榆叶梅进行了核型分析,核型公式为2n=8x=64=32m+14sm+18st。核型不对称系数为66.27%,最长染色体与最短染色体长度比为2.36,臂比大于2.0的染色体占40.6%。在32对染色体中有7对染色体为近中部着丝点染色体,16对为中部着丝点染色体,9对为近端部着丝点染色体。核型在遗传进化上属于较进化的2B型。但居群中存在明显的非整倍现象,染色体数目从61~64不等,整倍体占67.5%。非整倍体在染色体数量、染色体相对长度、臂比值等参数方面均存在一定差异,说明野生榆叶梅居群在细胞学水平上的遗传多样性与表型变异丰富是相一致的。
     以上研究为科学合理地引种、驯化、保护和利用野生榆叶梅资源提供了理论依据及数据支持。
Prunus triloba is a deciduous and flowering shrub or small tree species, which belongs to Prunus of Rosaceae. Prunus triloba is a famous ornamental plant in China, and mainly distributed in the Northeast and North China. Having various kinds of varieties and long history of cultivation, Prunus triloba has been widely used in landscape as an important early spring flowering ornamental in Northern China. However, few researchers have ever studied its wild resources systematically. Prunus triloba is octaploid (2n=8x=64), distributed in slopes, valleys or forest edges in middle elevation areas. There are many variation types of Prunus triloba, since it has strong adaptability to environment and great natural variation. The study intends to investigate and sample part of Prunus triloba wild populations, explore its variation pattern in fields, thus providing theoretical evidence for the conservation, selection and variety resource evolution of Prunus triloba and launch the introduction work of its wild resources, laying a foundation for cross breeding of Prunus triloba and related basic research. The results are listed as follows:
     1. The study investigated the distribution of wild Prunus triloba in Liaoning province, Hebei province and Beijing, took samples and made comparisons among representative populations. Prunus triloba is mainly distributed along both sides of valleys but rarely seen in mountain ridges. Large populations are concentrated in areas with gentle slope, among which there are Prunus davidiana and Prunus sibirica trees, and the majority is Prunus davidiana. More of the two species are distributed around Prunus triloba populations. Consequently, Prunus triloba has a complicated genetic background after long-term natural Election aid cross pollination.
     2. The study explored the phenotypic characteristics of6Prunus triloba wild populations. The results of variance analysis show that there are significant differences among populations and among individuals within populations. The variation among populations was slightly higher than that within populations, which indicated that the variance within populations was the main part of the phenotypic variation of Prunus triloba wild populations. Hence, the number of sampling from populations could be reduced while the number of sampling from individuals within populations could be increased in the genetic improvement of Prunus triloba, which means that it is essential to select superior individuals within populations.
     3. The results of UPGMA cluster analysis show that6Prunus triloba wild populations could be divided into2groups, but the cluster of characters were not based on the geographical distances, which reveal the discontinuous phenotypic variances within groups. The results of PAC indicate that the first6main factors could be used to replace parts of original characters with the accumulative contribution only up to57.33%. It is important to keep the integrity of populations in germplasm resource preservation of Prunus triloba.
     4. AFLP was employed to analyze genetic diversity of6wild populations of Prunus triloba. In this study,8pair primers previously identified were used to amplify specific DNA bands in the6Prunus triloba populations. As a result,256DNA bands were generated and206of them were polymorphic bands, which was80.47%of the total bands. Each primer pair generated129polymorphic bands on average and the mean polymorphism rate was50.26%. Among the6populations, the total observed number of alleles (Na) was1.8047and the mean was1.5026; the effective number of alleles (Ne) was1.2458and the average was1.2165; the Ne's gene diversity index (H) was0.1567and the average H was0.1355; the total Shannon's index (I) was0.2554and the average was0.2134. The results of genetic differentiation indicate that86.4%of the genetic variation should be among populations while13.53%should be within a population. The result of AFLP analysis reveals that dendrogram of6wild Prunus triloba populations is as similar as the clustering by geographic distance.
     5. Karyological data of P. triloba in Beijing population were investigated via squash method. The results showed all samples were octoploid (2n=8x=64). Asymmetry index was66.27%. The ratio of chromosome length, the longest chromosome to the shortest one was2.36. The karyotypes of all the test samples were made of m (7pairs), s (16paris) and st (9pairs) chromosomes. The karyotype was2B which belonged to a relative advanced type in evolutionary. Aneuploidy was observed in this study, the chromosome number ranged from61to64, the asymmetry index, centromere index and constitution of relative length etc. were different. The results confirmed that genetic diversity in cytological level were in accordance with the rich morphological variants among all the populations.
     The study can provide theoretical and data evidence for the conservation and exploitation of wild Prunus triloba germplasm resources and the introduction, domestication, propagation and cultivation of wid Prunus triloba.
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