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首页> 外文学位 >Genetic analysis of inheritance and linkage of molecular markers, and variability of adaptive, morphological and reproductive traits in common bermudagrass [Cynodon dactylon (L.) Pers.].
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Genetic analysis of inheritance and linkage of molecular markers, and variability of adaptive, morphological and reproductive traits in common bermudagrass [Cynodon dactylon (L.) Pers.].

机译：对普通百慕大草[Cynodon dactylon（L.）Pers。]的分子标记遗传和连锁的遗传分析以及适应性，形态和生殖性状的变异性。

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摘要

Common bermudagrass [Cynodon dactylon (L.) Pers.] is economically and environmentally the most important member among Cynodon species because of its extensive use for turf, forage and soil erosion control in the world. However, information regarding the inheritance, genetic linkage and cold germplasm variability analysis within this taxon is limited. Therefore, the objectives of this study were 1) to determine qualitative inheritance mode in common bermudagrass; 2) to construct a genetic map based on simple sequence repeats markers for common bermudagrass; and 3) to quantify genetic variability and determine relationships among turf performance and reproductive traits. Two tetraploid (2n=4x=36), first-generation selfed populations, 228 progenies of 'Zebra' and 273 from A12359, were analyzed for segregation with simple sequence repeat markers in the first project. It was concluded that the inheritance mode of tetraploid bermudagrass was complete or near complete disomic, and the two bermudagrass parents had an allotetraploid genome with two distinct subgenomes. Severe transmission ratio distortions occurred in the Zebra population while less so in the A12359 population, so A12359 population was used for linkage analysis and bermudagrass map construction in the second project. A total of 249 simple sequence repeat primer pairs were mapped to 18 linkage groups. The total length for the map was 1094.7 cM with an average marker interval of 4.3 cM, and length for individual linkage groups ranged from 122.3 cM for LG 18 to 12.7 cM for LG 6. Comparative mapping was conducted to compare genomes of common bermudagrass, sorghum (Sorghum bicolor L.) and foxtail millet (Setaria italica L.), and three conservative regions among these three species were discovered in the study. The findings of disomic inheritance and construction of linkage map could be beneficial for quantitative trait loci mapping, marker assisted selection and other genome study in common bermudagrass. The third project focused on quantifying the genetic variability of important adaptive, morphological and reproductive traits in cold hardy common bermudagrass populations and testing possible correlations among these traits. Substantial and significant genetic variances were observed in our germplasm, which could be utilized in bermudagrass breeding programs such as producing interspecific hybrids and synthetic cultivars.
机译：普通百慕大草（Cynodon dactylon（L.）Pers ..）由于在世界范围内广泛用于草皮，牧草和土壤侵蚀控制，因此在经济上和环境上均是犬牙草物种中最重要的成员。但是，有关该分类单元内遗传，遗传连锁和冷种质变异性分析的信息有限。因此，本研究的目的是：1）确定普通百慕大草的定性遗传模式。 2）基于普通百慕大草的简单序列重复标记构建遗传图谱； 3）量化遗传变异性，并确定草皮性能与生殖性状之间的关系。在第一个项目中，使用简单的序列重复标记分析了两个四倍体（2n = 4x = 36）第一代自交种群，分别是228个'Zebra'子代和来自A12359的273个后代。结论是四倍体百慕大草的遗传模式是完全或接近完全二体组的，并且两个百慕大草父母具有具有两个不同亚基因组的异源四倍体基因组。斑马种群中严重的传输比率失真发生，而A12359种群中发生的比率较小，因此在第二个项目中将A12359种群用于连锁分析和百慕大草图的构建。总共249个简单序列重复引物对被定位到18个连接基团。该图的总长度为1094.7 cM，平均标记间隔为4.3 cM，各个连接基团的长度范围从LG 18的122.3 cM到LG 6的12.7 cM。进行了比较作图，以比较常见的百慕大草，高粱的基因组。研究中发现了高粱（双色高粱）和谷子（Setaria italica L.）三个保守区域。二体遗传的发现和连锁图谱的构建，对于普通百慕大草的数量性状基因座图谱，标记辅助选择及其他基因组研究具有重要意义。第三个项目侧重于量化耐寒的普通百慕大草种群中重要的适应性，形态和生殖性状的遗传变异性，并测试这些性状之间的可能相关性。在我们的种质中观察到大量的遗传变异，这些变异可用于百慕大草育种计划，例如产生种间杂种和合成品种。

著录项

  • 作者

    Guo, Yuanwen.;

  • 作者单位

    Oklahoma State University.;

  • 授予单位 Oklahoma State University.;
  • 学科 Plant sciences.
  • 学位 Ph.D.
  • 年度 2015
  • 页码 85 p.
  • 总页数 85
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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