滇缅泰地区巨竹属（禾本科：竹亚科）的分类修订

	滇缅泰地区巨竹属（禾本科：竹亚科）的分类修订; Taxonomic revision of Gigantochloa Kurz ex Munro (Poaceae: Bambusoideae) from the Yunnan-Myanmar-Thailand floristic
	许祖昌
导师	李德铢
摘要	The genus Gigantochloa Kurz ex Munro (Poaceae: Bambusoideae) comprises about 60 species distributed in the tropical region of Southeast Asia. As the dominant bamboo in tropical Asia, species of Gigantochloa are economically and ecologically important, and could be easily distinguished from other Bambusa-Dendrocalamus-Gigantochloa (BDG) complex bamboos by united filaments as tube when flowering material is available. Owning to the long flowering interval and extensive introduction and cultivation, the classification of Gigantochloa is confusing; on the other hand, due to the extensive gene flow in BDG, the systematic position and interspecific relationship of Gigantochloa have not been well solved. In this study, a taxonomic revision of Gigantochloa for the Yunnan-Myanmar-Thailand (YMT) floristic region was presented based on literature review, herbarium work, field observation, pseudospikelets anatomy as well as evidence of restriction-site associated DNA sequencing (ddRAD-seq). The results are summarized as follows: (1) More than 2600 specimens or digital photos from 27 herbarium have been checked, and the original materials (protologues and type specimens) and important monographs of Gigantochloa in the YMT floristic region were traced and reviewed. In the meantime, based on the field observation, we have taken more than 1000 ecological photos and made more than 100 collections with relevant molecular materials. (2) We dissected pseudospikelets of more than 90 of Gigantochloa and related genera, and concluded that the important characteristics of this genus that can be used to distinguished it from other closely related bamboos are the following: pseudospikelets clustered at each flowering branch nodes, oblong or linear, each with 2–4 florets and 1 terminal imperfect floret consisting only an empty lemma, obscure rhachilla internodes, paleas 2-keeled, the keels and the inflexed margins long-ciliate above; lodicules often absent; stamens 6, the filaments connated into a hyaline tube which can elongate and become membranous, with anthers apiculate with minutely hispidulous tip. The function and systematic significance of some characters were discussed, such as the number of lodicules and the filament tubes. (3) Based on the extensive sampling of Gigantochloa and its related genera (a total of 56 taxa including 27 samples of Gigantochloa), we reconstructed the phylogenetic relationships using ddRAD-seq data. It showed that a clade of Gigantochloa and Dendrocalamus Nees was resolved as monophyletic and was sister to Bambusa Schreber, but Gigantochloa forms a monophyletic which was embedded in the paraphyletic Dendrocalamus, and Gigantochloa fell into two highly supported sub-clades (named G1 and G2). Bamboos of G1 clade are mainly distributed in Indonesia, such as Gigantochloa kuring; while species in the G2 clade are mainly distributed in the YMT floristic region, such as G. albociliata. The results of network phylogenetic analysis indicated that
	2020-11
文献类型	学位论文
条目标识符	http://ir.kib.ac.cn/handle/151853/74235
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	许祖昌. 滇缅泰地区巨竹属（禾本科：竹亚科）的分类修订, Taxonomic revision of Gigantochloa Kurz ex Munro (Poaceae: Bambusoideae) from the Yunnan-Myanmar-Thailand floristic[D],2020.

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