共查询到18条相似文献，搜索用时 281 毫秒
1.
桤木（Alnus cremastogyne）为非豆科固氮树种，也是我国最重要的一个桤木属特有种，具有重要的生态功能。本文分析了桤木基因组SSR与EST-SSR两种来源标记的遗传差异，结果显示EST-SSR的平均等位基因数与平均有效等位基因数高于Genomic-SSR，而对平均观察杂合度与平均期望杂合度来说，Genomic-SSR高于EST-SSR，聚类分析显示Genomic-SSR与EST-SSR在小的分群上有差异，说明Genomic-SSR与ESTSSR标记在解析遗传多样性与遗传关系方面有一定差异，综合两种标记可以获得更加客观的结果。 相似文献
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日本落叶松EST-SSR标记开发及二代优树遗传多样性分析 总被引：1，自引：0，他引：1
利用SSR标记研究选自第1代育种试验林、拟纳入二代育种群体的264株日本落叶松二代优树的遗传变异情况。利用1620条落叶松EST序列进行EST-SSR标记的开发,共发现58条序列中含有67个SSR位点,占全部EST序列的3.58%。获得7个多态性EST-SSR标记,其中5个在朝鲜落叶松、长白落叶松、兴安落叶松和华北落叶松中均可扩增出预期目标片段,且具有多态性,表明这些标记在落叶松属内的通用性良好。利用6个EST-SSR标记和4个gSSR标记对日本落叶松二代优树群体开展遗传多样性分析,每个位点的平均等位基因数为4.6个,有效等位基因平均数为3.1个。群体观察和期望杂合度均值分别为0.5902和0.5702;Nei's基因多样度和Shannon多样性指数分别为0.5691和1.0966;全部单株间遗传相似系数0.1725～0.9667。说明该二代优树群体的遗传多样性较高,具有构建二代育种群体的潜力。 相似文献
3.
研究采用简单重复序列(SSR)分子标记方法，对黑龙江省24种茖葱进行遗传多样性分析，计算不同茖葱种质遗传多样性相关性数值，并通过一系列软件对上述相似性数值进行聚类分析。结果表明：黑龙江省不同茖葱种质间遗传距离较远，存在较丰富的遗传多样性。通过UPGMA软件可以将黑龙江省24份茖葱种质聚类分为两大类群Ⅰ和Ⅱ,第Ⅰ类群和第Ⅱ类群又各分为2个亚类群，聚类结果反映的不同种质间亲缘关系与其种植地点有一定关联。SSR聚类分析结果显示：亲缘关系近的品种有伊春五营翠北林场和伊春新春林业局北沟林场，另外，鹤北金矿林场、同江前进农场和伊春红星林业局汤北林场品种间亲缘关系较近。SSR分子标记技术揭示黑龙江省主要野生茖葱种源群体的遗传多样性，为黑龙江省茖葱种质资源的保护与高效利用提供理论基础。 相似文献
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【目的】开发适于黑莓Rubus spp.的EST-SSR引物,用于品种和种质的遗传多样性评价分析。【方法】基于前期获得的黑莓转录组数据,分析得到黑莓EST-SSR分子标记,筛查符合要求的SSR序列,设计合成127对较理想的EST-SSR引物进行扩增和多态性引物筛选,利用多态性好的引物用于18个引种黑莓栽培品种的遗传多样性分析。【结果】在127对引物中有125对可扩增出条带,有特异条带且大小符合预期的引物共有50对,50对引物中有45对具多态性的引物,占引物总数的36%,多数引物扩增的位点数为2~5。使用45对引物检测18个黑莓供试品种基因组DNA的多态性,共检测到191个等位基因变异,平均每个位点有4.24个等位基因,位点多态性信息含量为0.427~0.893,平均值为0.692。多态性最好的引物为Rh121,检测到8个等位基因,其次是Rh114和Rh118,均检测到7个等位基因。18份材料的遗传相似系数为0.49~0.88,表明品种间具有较丰富的遗传差异。利用UPGMA聚类,将18份种质分为3个类群,其中四倍体和多倍体黑莓品种明显归为不同类型,四倍体黑莓分为2类,相似育种产地的品种多聚在一起,推测与其品种遗传种质成分具一定相似性有关。【结论】EST-SSR标记可应用于黑莓品种种质遗传多样性分析,目前引种黑莓种质的遗传基础相对较窄。 相似文献
5.
利用SSR分子标记技术,对采自新疆额尔齐斯河流域阿尔泰市哈巴河及北屯地区的白杨派3个树种银白杨、银灰杨、欧洲山杨的半同胞家系子代进行遗传多样性分析.结果表明:筛选12对SSR引物在90个样本中共检测到58个等位基因(A)、112种基因型,多态位点百分率是100％,Nei遗传多样性指数(h)平均为0.648 5,Shannon多样性指数平均为1.234.基因分化系数(Fst)为0.337 l,即在总的遗传变异中有33.71％的变异来自于不同树种之间,绝大部分存在于子代个体间.白杨派内种间分化程度较高,种间遗传距离为0.3863～1.869;银灰杨的遗传变异最大,而银白杨的遗传变异最小. 相似文献
6.
为给落叶松杂种F1代进化潜力的研究提供资料,利用RAPD、SSR标记分析了日本落叶松×兴安落叶松杂种F1代147个个体的遗传多样性。RAPD遗传多样性分析结果为,有效等位基因数平均值1.669 1,Nei遗传多样度平均值为0.395 5,Shannon多样性指数平均值为0.583 1;SSR遗传多样性分析结果为,有效等位基因数平均值1.689 2,Nei遗传多样度平均值为0.399 8,SSR标记的Shannon多样性指数平均值0.587 0。SSR标记和RAPD标记所揭示的杂种F1群体遗传多样性水平各指数值基本一致,且都表明与日本落叶松杂交后,杂种F1群体在遗传多样性上高出兴安落叶松。 相似文献
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《中南林业科技大学学报(自然科学版)》2020,(8)
【目的】目前杉木分子标记数量无法满足种质资源评价及分子标记辅助育种等相关研究需求,需要开发更多的杉木SSR标记十分重要。【方法】以陈山红心杉转录组测序数据为基础,进行EST-SSR标记的检测和开发,并对陈山红心杉二代种子园进行遗传变异分析。【结果】转录组测序共获得99 122 394个reads片段,包含了14.87 Gb的序列数据。序列组装后,获得76 597个unigene,共计104.18 Mb数据,平均长983 bp。寻找到8 072个SSR位点,单核苷酸和三核苷酸是主要重复类型,分别占总数的66.30%和17.48%,其次是二核苷酸重复类型,占总数的12.31%。AT/TA和AG/TC是主要的双碱基重复序列,分别占总位点数的6.79%和1.93%。AGA/TCT和AAG/TTC是主要的三碱基重复序列,分别占总位点数的1.45%和1.44%。从随机挑选的150对SSR引物中筛选出11对多态性引物。陈山红心杉二代种子园SSR位点间的平均等位基因数为4.4个,有效等位基因为2.4个;群体平均观察杂合度、期望杂合度、Shannon多样性指数分别为0.533 5、0.563 8、1.003 4,表明该种子园遗传多样性较高。陈山红心杉二代种子园无性系间的遗传相似系数在0.240 0～0.977 8之间,平均值为0.589 3,说明这一群体有较宽的遗传基础。在阈值0.62处可将无性系划分为6个亚群体,亚群体内个体数量差异较大。【结论】本研究基于陈山红心杉转录组数据开发出11对EST-SSR标记,丰富了杉木分子标记库,这些标记可用于杉木种质资源评价、遗传多样性分析及分子标记辅助育种等方面。 相似文献
9.
[目的]利用表型性状和分子标记,对我国油橄榄品种进行鉴定和遗传多样性研究,有利于种质资源保存和利用,对了解油橄榄品种的组成结构及未来的引种和育种工作都具有重要意义。[方法]以甘肃省陇南市17个油橄榄品种为研究材料,利用表型上15个数量性状、18个质量性状和8个SSR荧光标记分别进行多样性和聚类分析。[结果]各性状在品种间存在显著差异,数量性状和质量性状的表型多样性指数分别介于1.579 2.089和0.3621.091,8个SSR位点共检测到51个等位基因变异,平均每个位点等位基因数为6.375个,利用表型性状和SSR标记可以将17个品种完全区分开。[结论]17个油橄榄品种具有较丰富的表型和遗传多样性,基于表型数量性状、质量性状和SSR标记的聚类分析结果,判别品种间遗传关系的结果有一致的,也存在一定差异。对于表型性状相似的品种,需结合SSR标记进行品种鉴定。 相似文献
10.
《经济林研究》2020,(3)
【目的】使用黑果枸杞的转录组数据开发适合枸杞的EST-SSR引物,用于分析评价枸杞品种和种质的遗传多样性,为黑果枸杞种质资源评价和新品种培育提供理论依据。【方法】基于NCBI公共数据库已经发表的黑果枸杞果实转录组数据,分析得到枸杞的EST-SSR分子标记,合成了符合设计标准的182对EST-SSR引物,经过扩增和多态性筛选后,将多态性好的引物用于30份枸杞材料的遗传多样性分析。【结果】在182对引物中,有176对引物可以扩增出条带,共筛选出20对多态性好、有特异性的引物,其多数引物扩增条带数为2～8条。使用20对引物在30份枸杞材料中共扩增得到121条条带,平均每对引物扩增出6.05条,有效等位基因数(N_e)的均值为1.473 1个,Nei’s多样性指数(H)的均值为0.291 7,Shannon信息指数(I)的均值为0.451 7,多态性信息含量(PIC)均值为0.667,30份材料的遗传相似系数为0.459 2～0.991 8,表明品种间具有较丰富的遗传差异。聚类分析结果表明,30份枸杞材料被分为6个组,黑果枸杞与红果枸杞明显归于不同类型,不同种源地的黑果枸杞可以明显区分,相同省区或相近地区的材料多聚在一组,由此推测,这与其种质遗传成分具有一定的相似性有关。整体聚类分析结果与供试材料来源信息基本对应。【结论】红果枸杞栽培品种之间的遗传距离较小,甘肃的黑果枸杞与青海、新疆的黑果枸杞材料之间其遗传多样性均存在较大差异,利用黑果枸杞转录组数据开发出的SSR分子标记,不仅适用于枸杞的遗传多样性研究,还可适用于黑果枸杞遗传多样性的分析与评价。 相似文献
11.
Yue-peng Song Xi-bing Jiang Man Zhang Ze-liang Wang Wen-hao Bo Xin-min An De-qiang Zhang Zhi-yi Zhang 《中国林学(英文版)》2012,14(1):1-7
We analyzed the genetic differences of 16 poplar clones between genomic-SSR and EST-SSR markers.The statistical results show that the average number of alleles detected by genomic-SSR was 4.1,Shannon’s index 1.0646,observed heterozygosity 0.4427 and expected heterozygosity 0.5523,while for the EST-SSR,the average number of alleles was 2.8,Shannon’s index 0.6985,observed heterozygosity 0.2330 and expected heterozygosity 0.4684.Cluster analysis indicated that the EST-SSR capacity of genotypic identification was more precise than that of genomic-SSR.These results reveal that EST-SSR and genomic-SSR have statistically significant genetic differences in polymorphism detection and genotypic identification.These differences could provide a theoretical basis for the rational use of SSR markers in species diversity and other related research. 相似文献
12.
Although most Sinojackia species are endangered, they contribute greatly to the biodiversity of local ecosystems. Sinojackia microcarpa, an endangered species, is distributed only in three provinces of eastern China. Determining the genetic diversity of S. microcarpa provides key information for germplasm evaluation and species conservation. Here we used simple sequence repeat (SSR) markers to investigate the genetic diversity of eight natural populations of S. microcarpa. Leaf samples were collected from 144 individuals in 8 wild populations. The 156 bands were generated from 14 pairs of informative SSR primers, with an average percentage of polymorphic bands of 45.67%. The average values of Nei’s genetic diversity (He) and Shannon’s diversity index (I) were 0.1007 and 0.1658, respectively. The total genetic variation of S. microcarpa existed mainly within the eight populations, rather than among populations, and reached 86.41%. A cluster analysis showed that the eight wild populations of S. microcarpa could be classified into four groups, at a threshold of 4.0, based on an analysis of the SSR genotypes. Furthermore, there was a significant association between the phylogenetic relationships and the geographic locations of the S. microcarpa populations. In particular, populations from Fuyang, Jiande, and Lin’an in Zhejiang Province had close phylogenetic relationships and geographic distances. In addition, these three populations had the highest genetic diversity and the most individuals, suggesting that these three locations may be the S.microcarpa distribution center. This study serves as a model for studying the genetic diversity of endangered plant species. 相似文献
13.
分子标记法和形态学特征对杏仁栽培种及野生种基因型的遗传关系构建的辨别 总被引：1，自引：0，他引：1
Karim Sorkheh Behrouz Shiran Soghra Kiani Nazanin Amirbakhtiar Sadegh Mousavi Vahid Rouhi Shahram Mohammady-D Thomas M.Gradziel Lyudmyla V.Malysheva-Otto Pedro Martínez-Gómez 《林业研究》2009,20(3):183-194
应用23个形态学特征,19个扩增片段长度多态性(AFLP)引物组合,80个随机扩增多态DNA(RAPD)引物和32个简单序列重复(SSR)引物对,比较三种分子标记法在29个杏仁栽培种和3个野生种遗传关系构建中的信息景和效率.根据预期杂合度的评价,与AFLPs和RAPDs相比,SSRs具有较高水平的多态性和较大的信息量.AFLPs预期朵合度值最低,但其辨别效率值最高,因为AFLPs能揭示每个反应中的大量条带,导致各种类型的多样性指数均较高.三种分子标记法对杏仁基因型的辨别效率均较高,只是SSRs无法辨别‘Monagha'和‘Sefied'杏仁基因型.三种分子标记法基因型相似性相关系数统计上显著,但SSR数据要低于RAPDs和AFLPs的值.尽管三种分子标记法树形图拓扑结构存在一些差异,但相似性水平均较高.SSRs、RAPDs和AFLPs的系统树图及其综合数据都能依据地理散布反映大多数栽培种的关系.AMOVA检测到每个地理组中栽培种和野生种的变异.辅助程序分析表明,实验所应用的标记物数量足以保证基因相似性估计的可靠性和标记法间的比较是有意义的. 相似文献
14.
In this study,28,691 genome sequences and16,566 expressed sequence tags(ESTs) of Eucalyptus were derived from the Gen Bank database.A total of 2292 SSR loci were sought out from 1785 effective sequences.Through analyses of SSR loci information,the SSR motif length was negatively correlated with the abundance of the SSRs.In the EST sequences of Eucalyptus,triplet repeat motifs were the most abundant,and dinucleotide repeats motifs had the highest frequencies.Subsequently,395 pairs of primers were designed based on the SSR loci.Using optimized SSR-PCR conditions,340 pairs of primers were successfully screened,with a success rate of 86.1%.By construction of a maximum likelihood phylogenetic tree of six eucalypt species,represented by five species of the genus Eucalyptus and one of the genus Corymbia,the genetic relationships of Eucalyptus urophylla and E.camaldulensis suggested by this tree was found to differ from that suggested by traditional morphological taxonomy.The results provide insights for evaluating geneticdiversity of Eucalyptus and analysis of Eucalyptus phylogenetics using SSR markers. 相似文献
15.
Expressed sequence tags(ESTs) are generated from single-pass sequencing of randomly picked cDNA clones and can be used for development of simple sequence repeat(SSR) markers or microsatellites.However,EST databases have been developed for only a small number of species.This paper provides a case study of the utility of freely available birch EST resources for the development of markers necessary for the genetic analysis of Betula luminifera.Based on birch EST data,primers for 80 EST-SSR candidate loci were ... 相似文献
16.
对NCBI(美国国立生物技术信息中心)中牡丹的ESTs(expressed sequence tags)的序列进行分析,结果表明:在所分析的2 204条序列中,仅324条分布有SSRs(simple sequence repeats),占全部ESTs序列的14.70%;SSR的出现频率为15.20%,共计335个,其中,二核苷酸重复比例84.18%,三核苷酸重复比例为15.22%,四和六核苷酸重复比例为0.30%。在此基础上,利用软件(serafer 1.3)设计了51对备选SSR引物,以6个滇牡丹不同花色类群DNA为模板对引物进行筛选,其中,10对引物有扩增产物;用这些引物进一步在10个类群50个DNA模板进行多态性测试,结果显示:上述10对SSR引物均有多态性,且同一类群内不同模板DNA间也存在多态性。本研究结果证明:基于牡丹EST信息建立SSR标记是一种有效而可行的方法,有助于滇牡丹遗传多样性分析及基因组学方面的研究。 相似文献
17.
Marcucci Poltri SN Zelener N Rodriguez Traverso J Gelid P Hopp HE 《Tree physiology》2003,23(9):625-632
A Eucalyptus dunnii Maiden breeding population of 46 accessions originated in Australia and selected for fitness to subtropical and cold environments was screened by Amplified Fragment Length Polymorphism (AFLP) and microsatellite markers to obtain quantitative estimates of genetic diversity. A randomly chosen group of AFLP primers generated 205 AFLP bands that were used to fingerprint the genotypes and to evaluate genetic relationships among accessions. Sixty-eight percent (140) of the bands were polymorphic markers. The mean diversity index (DI) was 0.33 and about 52% of the loci had values greater than 0.4. Cluster analysis derived from similarity indices (SI) revealed no particular grouping among accessions suggesting the absence of closely related genotypes, except for five pairs of genotypes. Bootstrap analysis results confirmed the suitability of AFLP to describe genetic relationships in this breeding population. In addition, four highly informative microsatellites were used to construct an identification matrix that discriminated nearly all of the genotypes. Mean values for the number of alleles per locus, DI and SI among accessions were 13, 0.78 and 0.19, respectively, indicating that the breeding population has high genetic diversity. However, several genotypes showed the presence of single microsatellite bands suggesting a putatively important degree of homozygosity. Molecular data were used to design a clonal seed orchard. To achieve this aim, the nine most divergent pairs of genotypes were chosen, thereby retaining 95.2% of the total number of alleles from the 140 polymorphic AFLP loci and the four microsatellite loci analyzed. Mean DI and SI for AFLP and microsatellites showed no significant differences between the original breeding population and the selected seed orchard, confirming that a seed orchard can be designed with a limited number of individuals, which allows similar accessions to be discarded and avoids inbreeding. 相似文献
18.
Filomena Gomes Rita Costa Maria M. Ribeiro Elisa Figueiredo Jorge M. Canhoto 《林业研究》2013,24(2):227-236
The strawberry tree (Arbutus unedo L.) is an underutilized, drought tolerant, fire resistant species with a south western distribution in Europe, and with ecological and putative socio-economical impact in Portugal and Mediterranean countries. Our aim was to develop an appropriate set of molecular markers to enable genetic diversity to be assessed and to fingerprint Arbutus unedo genotypes for breeding and conservation purposes in Portugal. Twenty-seven trees from a broad geographic range were screened with 20 random amplified polymorphic DNA (RAPD primers) and 11 microsatellite markers (SSR). The RAPDs generated 124 bands, 57.3% of which were polymorphic, with an expected heterozygosity of 27%. We cross-amplified 11 SSR primers developed for Vaccinium spp., and 5 were found to be polymorphic in A. unedo, with 75% of expected heterozygosity, a number of alleles of 11.6, a null allele frequency of 7.6% and a polymorphic information content of 71%. Although the SSRs were more polymorphic and informative than the RAPDs, both markers displayed high genetic variability with the gathered data. No geographic pattern was observed in the genetic variation distribution based on both marker systems, and the lack of correlation between genetic and geographical matrices was confirmed by Mantel tests. Likely, no correlation was found between pairwise SSR and RAPD band-sharing matrices. These results and their implications on A. unedo breeding and conservation programs are discussed. 相似文献