KIB OpenIR  > 昆明植物所硕博研究生毕业学位论文
中国冬青属刺齿冬青组(Ilex sect. Ilex)的分类修订; Taxonomic Revision of Ilex sect. Ilex (Aquifoliaceae) in China
Thesis Advisor彭华
AbstractThe genus Ilex L. comprising more than 400 species, is the sole genus of Aquifoliaceae and the largest genus of dioecious woody plants. Ilex sect. Ilex is the largest section of this genus in China and more than 80 species of has been recorded in here. As the sub-dominant or co-dominant constituent of the overstory layer in subtropical evergreen broad-leaved forest in China, I. sect. Ilex is ecologically and economically important, whereas the species delimitation for quite a lot of members in this section is still crucially problematic. In this study, multidisciplinary approach has been applied to achieve a better classification of I. sect. Ilex. Conducting field investigations for I. sect. Ilex species in China, we have collected more than 240 collections, 300 DNA materials and 11000 photos. Besides, more than 15000 specimens or digital photos (including 600 type specimens or photos) from 55 herbaria have been checked, as well as extensive literatures especially for protologues of all published names have been reviewed and collated. Three nuclear loci (ITS, ETS and nepGS) were sequenced for phylogeny reconstruction of Ilex applying Bayesian inference (BI) and maximum likelihood (ML) methods. 161 Ilex species (175 samples) were selected as ingroup and Helwingia japonica and Phyllonoma ruscifolia as outgroup. Results suggest all sections in morphological classification are non-monophyletic, and thirteen newly described clades have also been supported by morphological and distributional evidences. Moreover, all sampled I. sect. Ilex species were contained in Ilex Clade, which also include two I. sect. Pseudoaquifolium species. The phylogeny reconstruction based on 64 I. sect. Ilex species (66 samples) and two nuclear loci (ITS and ETS) shows that I. sect. Ilex should be divides into 9 alliances well supported in morphology and distribution, with two species (without distribution records in China) unresolved. This result is inconsistent with the Hu’s classifications of I. sect. Ilex which subdivides it into 5 series. Combined with the result of divergence times dating and ancestral area reconstructions, it suggested that Ilex have a Late Cretaceous origin in neotropical area and gradually migrated to North America, Eurasia, and sub-Africa and northern Australia, all clades in Ilex finished their origin in the warm period from Late Oligocene to Middle Miocene. Furthermore, Ilex sect. Ilex (Ilex Clade) experienced an Eurasian origin in the Oligocene-Miocene boundary and started its divergence in Middle Miocene, probably as the result of responding to the strengthening of summer monsoon in East Asia and the boom of subtropical evergreen broad-leaved forests. Taxonomic revision of Ilex sect. Ilex from China is conducted based on molecular phylogenic results and morphological and distributional evidences. A total of 77 species, two subspecies, one variety and two hybrids of Ilex sect. Ilex have been recognized in China. The detailed revisions are showed
Document Type学位论文
Recommended Citation
GB/T 7714
阳亿. 中国冬青属刺齿冬青组(Ilex sect. Ilex)的分类修订, Taxonomic Revision of Ilex sect. Ilex (Aquifoliaceae) in China[D],2020.
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