Chloroplast rbcL sequences of 60 species of Polystichum sensu lato (S.l.), including 23 new sequences from southwest China, were used to assess the phylogenetic relatipmships within the genus. On the basis of estimate...Chloroplast rbcL sequences of 60 species of Polystichum sensu lato (S.l.), including 23 new sequences from southwest China, were used to assess the phylogenetic relatipmships within the genus. On the basis of estimated evolution rate of rbcL gene and the genetic distance data that passed relative-rate tests, we further estimated the diver- gence times betwcen some clades of the genus. The phyloge- netic relationships were inferred using the neighbor-joining and maximim-parsimony methods, both methods producing trees with completely congruent topology. These trees reveal that all species of Polystichum s.I. in this study (including Cyrtomium and Cyrtomidictyum) form a monophyletic group. The basal split in Polystichum s.I. separates a clade with all Asian members from a elade containing other species from all over the world. The phylogenetic and divergence time estimation results lead us to suggest that Polystichum S.I. originated in Asia in the late Late Cretacous (≈76 Ma) and migrated into other places in the world in early Eocene (≈ 46 Ma).展开更多
The taxonomic status of the Eastern Asia endemic Sorolepidium is controversial. Some authors accept it as member of the large diverse genus Polystichum, whereas others suggest that it is an independent genus separated...The taxonomic status of the Eastern Asia endemic Sorolepidium is controversial. Some authors accept it as member of the large diverse genus Polystichum, whereas others suggest that it is an independent genus separated from the later by the exindusiate sorus and the absence of aristate teeth at the pinnae margins. Here we infer phylogenetic relationship of Sorolepidium using DNA sequences of the chloro-plast rbcL gene. Phylogenies were inferred using maximum-parsimony, maximum-likelihood, and Bayesian inference methods. Molecular data establish that Sorolepidium is deeply nested within the large genus Polystichum and has a close relationship with P. duthiei and P. lachenense in the model-based analyses. The Kimura 2-parameter distances of the rbcL sequences between S. glaciale and P. duthiei and P. lachenense were 0.1 and 0.2%, respectively. Furthermore, S. glaciale differed from P. duthiei by a single nucleotide in their rbcL sequences. Close relationships between S. glaciale and P. duthiei and P. lachenense are also supported by the shared spore ornamentation with echinate fenes-trate folds.展开更多
1 疏果耳蕨 新种 图1:A—D Polystichum oligocarpum Ching ex H. S. Kung et L. B. Zhang, sp. nov. Species affinis P. yunnanensi Christ, differt lamina oblongo-lanceolata, paleis rhacheosminus tectis, pinnis evidenter incu...1 疏果耳蕨 新种 图1:A—D Polystichum oligocarpum Ching ex H. S. Kung et L. B. Zhang, sp. nov. Species affinis P. yunnanensi Christ, differt lamina oblongo-lanceolata, paleis rhacheosminus tectis, pinnis evidenter incurvis, apice caudatis, pinnulis oligosoris, indusiis integrisvel subintegris.展开更多
通麦耳蕨 新种 Polystichum tangmaiense H. S. Kung et Y. Tateishi, sp. nov. Species nova P. discreto (Don) J. Sm. proxima, sed magnitudine minore, lamina latelanceolata vel late oblanceolata, pinnula subrhomboidea vel o...通麦耳蕨 新种 Polystichum tangmaiense H. S. Kung et Y. Tateishi, sp. nov. Species nova P. discreto (Don) J. Sm. proxima, sed magnitudine minore, lamina latelanceolata vel late oblanceolata, pinnula subrhomboidea vel oblique oblonga differt. Tota planta c. 25 cm alta. Rhizoma erectum, paleis brunneis, lanceolatis dense obtec-展开更多
文摘Chloroplast rbcL sequences of 60 species of Polystichum sensu lato (S.l.), including 23 new sequences from southwest China, were used to assess the phylogenetic relatipmships within the genus. On the basis of estimated evolution rate of rbcL gene and the genetic distance data that passed relative-rate tests, we further estimated the diver- gence times betwcen some clades of the genus. The phyloge- netic relationships were inferred using the neighbor-joining and maximim-parsimony methods, both methods producing trees with completely congruent topology. These trees reveal that all species of Polystichum s.I. in this study (including Cyrtomium and Cyrtomidictyum) form a monophyletic group. The basal split in Polystichum s.I. separates a clade with all Asian members from a elade containing other species from all over the world. The phylogenetic and divergence time estimation results lead us to suggest that Polystichum S.I. originated in Asia in the late Late Cretacous (≈76 Ma) and migrated into other places in the world in early Eocene (≈ 46 Ma).
基金Supported by the National Natural Science Foundation of China (Grant No. 30228004)Wong Kuan Chung Education Foundation of Hong Kong
文摘The taxonomic status of the Eastern Asia endemic Sorolepidium is controversial. Some authors accept it as member of the large diverse genus Polystichum, whereas others suggest that it is an independent genus separated from the later by the exindusiate sorus and the absence of aristate teeth at the pinnae margins. Here we infer phylogenetic relationship of Sorolepidium using DNA sequences of the chloro-plast rbcL gene. Phylogenies were inferred using maximum-parsimony, maximum-likelihood, and Bayesian inference methods. Molecular data establish that Sorolepidium is deeply nested within the large genus Polystichum and has a close relationship with P. duthiei and P. lachenense in the model-based analyses. The Kimura 2-parameter distances of the rbcL sequences between S. glaciale and P. duthiei and P. lachenense were 0.1 and 0.2%, respectively. Furthermore, S. glaciale differed from P. duthiei by a single nucleotide in their rbcL sequences. Close relationships between S. glaciale and P. duthiei and P. lachenense are also supported by the shared spore ornamentation with echinate fenes-trate folds.
文摘1 疏果耳蕨 新种 图1:A—D Polystichum oligocarpum Ching ex H. S. Kung et L. B. Zhang, sp. nov. Species affinis P. yunnanensi Christ, differt lamina oblongo-lanceolata, paleis rhacheosminus tectis, pinnis evidenter incurvis, apice caudatis, pinnulis oligosoris, indusiis integrisvel subintegris.
文摘通麦耳蕨 新种 Polystichum tangmaiense H. S. Kung et Y. Tateishi, sp. nov. Species nova P. discreto (Don) J. Sm. proxima, sed magnitudine minore, lamina latelanceolata vel late oblanceolata, pinnula subrhomboidea vel oblique oblonga differt. Tota planta c. 25 cm alta. Rhizoma erectum, paleis brunneis, lanceolatis dense obtec-
