姜属（Zingiber Mill.）的系统学研究

	姜属（Zingiber Mill.）的系统学研究; Systematic study of Zingiber Mill. (Zingiberaceae)
	白琳
导师	李德铢
摘要	Zingiber is the second largest genus of family Zingiberaceae, containing about 120 to 150 species that are widely distributed in tropical to warm-temperate Asia (i.e. East and Southeast Asia to Indian subcontinent). Zingiber is a group of significant economic importance, with many species well-known for their use as a human food and also for medical and ornamental purposes. However, this is a taxonomically difficult group where the species delimitation is obscure and complicated and misapplications of names are frequent. The infrageneric relationship of the genus is also poorly studied. The hitherto most commonly used classification which recognise four sections and which were established nearly 140 years ago does not adequately accommodate the diversity within the genus, and some sections are inaccurately defined while others appear artificial. As to recent phylogenetic studies, these were based on a very inadequate sampling density (of both taxa and markers), and the topologies produced were poorly supported and not congruent. These above-mentioned problems have constrained the effective conservation, economic utilization and research of this important genus. Therefore, by greatly improving the sampling of taxa (over half of the species representing all four previously recognized sections were sampled) and gene marker (DNA sequences of 1180 nuclear genes and 78 chloroplast genome CDS were obtained), this project conducted a thorough investigation on the infrageneric relationship of the genus. Our findings are: 1) Four well supported groups were recognized within Zingiber: A, Ellipticum_group which includes species from Dymczewiczia and several Pleuranthesis and which is sister to the remaining species of Zingiber, B, Cryptanthium_majore, which includes species that belongs to Z. sect. Cryptanthium species but excludes the “Oligophyllum complex” and which is sister to the remaining to two clades, C, Zingiber_group, a clade formed by all Z. section Zingiber species, and D, Cryptanthium_Oligophyllum, which had been called “Oligophyllum complex” and had been regarded as belong to Z. sect. Cryptanthium in the past. This structure is incongruent with previous studies that uses a few genes and there is also prevalent incongruence among genes trees reconstructed in this study. This result also conflicts with the pollen morphology of the genus, e.g Cryptanthium_majore and Cryptanthium_Oligophyllum clade with the same type of pollen do not constitute a monophyletic clade. However, the nuclear gene species trees in this study are almost always well supported, irrespective of different sequence assembling, gene filtering and species tree reconstruction strategies used. An analysis of concatenated 78 Chloroplast CDS also supported the same four-clade structure. A divergence time estimation suggest that the genus Zingiber is a rapid diversified genus, and diversified into four clade within a very short 3 myr. This indicates that the sequence of the divergenc
	2019-12
文献类型	学位论文
条目标识符	http://ir.kib.ac.cn/handle/151853/74104
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	白琳. 姜属（Zingiber Mill.）的系统学研究, Systematic study of Zingiber Mill. (Zingiberaceae)[D],2019.

条目包含的文件
文件名称/大小	文献类型	版本类型	开放类型	使用许可
白琳-出站报告_10Dec (修复的) （4146KB）	学位论文		限制开放	CC BY-NC-SA	请求全文