被子植物叶绿体系统发育基因组学研究

	被子植物叶绿体系统发育基因组学研究; Plastid Phylogenomics of Angiosperms
	甘露
导师	伊廷双
摘要	Angiosperms are dominant components of the global terrestrial ecosystems with 64 orders, 433 families, approximately 13,000 genera and 295,000 to 370,000 species, many angiosperms have extremely high economic value, and building a good angiosperm phylogenetic system is very important for studying diversity of angiosperms. The APG system provides a robust summary of the phylogenetic relationships at family level and above, but this is only a consistent tree obtained by integrating previous studied results. It is crucial to reconstruct a well-supported angiosperm phylogenetic tree based on molecular data of all families. Early phylogenetic analyses of angiosperms based on single or multiple gene fragments have gradually built up a basal framework of angiosperm phylogeny and most interordinal phylogenetic relationships. However, relationships among the core angiosperms and some orders are conflicting in phylogenetic analyses using different gene fragments, and many interfamilial relationships have not been well resolved. With the accumulation of plastome data, plastid phylogenetics have been rapidly developed, and the phylogenetic relationships among some orders and families that could not be resolved in the early studies have been resolved by large-scale plastome data. PPA, the largest-scale sampling of angiosperm plastid phylogenetic study nowadays, has provided substantial essential insights into the relationships among angiosperms above the family. However, the lack of sampling in many families makes it impossible to resolve all interfamilial relationship. In particular, some monotypic or oligotypic families being not included in previous phylogenetic studies, often have a narrow distribution range and are hard to be sampled. In recent years, the method of obtaining plastomes through genome skimming data has gradually matured. The complete plastome sequence can be obtained from plant specimen materials. These methods have made it possible to get plastome data of all families of angiosperms, and provided an opportunity to reconstruct the phylogenetic relationships of angiosperm families and above. In this study, we sampled all the families of angiosperms including newly sequenced 86 plastomes of 57 families and all available plastomes in previous studies and online databases. Based on 80 plastid genes of 4,792 samples representing 4,724 species, an angiosperm phylogenetic tree was constructed to analyze the phylogenetic relationships among branches, orders, and families of angiosperms. The main results and conclusions are as follows: 1. Obtaining complete plastome data of difficult groups of angiosperms In this study, 70 complete plastome data were obtained from genome skimming data, and three complete plastome sequences were published and submitted to GenBank, mading up for the lack of complete plastome data of Irvingiaceae, Pentadiplandraceae, and Ctenolophonaceae in GenBank. In addition, the plastomes of four heterotrophic groups were obtained
	2020-11
文献类型	学位论文
条目标识符	http://ir.kib.ac.cn/handle/151853/74244
专题	昆明植物所硕博研究生毕业学位论文
推荐引用方式 GB/T 7714	甘露. 被子植物叶绿体系统发育基因组学研究, Plastid Phylogenomics of Angiosperms[D],2020.

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