A few species in the genus Grateloupia （Halymeniaceae, Rhodophyta） have been investigated in detail with respect to morphological observations and molecular analyses. In this study, the au- thors document the vegeta...A few species in the genus Grateloupia （Halymeniaceae, Rhodophyta） have been investigated in detail with respect to morphological observations and molecular analyses. In this study, the au- thors document the vegetative and reproductive structures of two new species of Grateloupia, G. dalianensis H.W.Wang et D.Zhao, sp.nov, and G. yinggehaiensis H.W.Wang et R.X.Luan, sp.nov. They both have the morphological character that carpogonial ampullae and auxiliary cell ampullae are the simple Grateloupia-type. The two species can be distinguished from other species of the genus by their distinctive morphological features respectively. Bused on ribulose-l,5-bisphosphate carboxylase/oxygenase （rbcL） gene sequences, the phylogenetic tree obtained in the study indicated that they are both embedded within the Grateloupia clade. G. dalianensis clusters a subclade with G. asiatica, and G. yinggehaiensis forms a single monophyletic subclade with G. hawaiiana.展开更多
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
基金The general program of the National Natural Science Foundation of China (NSFC) under contract No.30870161
文摘A few species in the genus Grateloupia （Halymeniaceae, Rhodophyta） have been investigated in detail with respect to morphological observations and molecular analyses. In this study, the au- thors document the vegetative and reproductive structures of two new species of Grateloupia, G. dalianensis H.W.Wang et D.Zhao, sp.nov, and G. yinggehaiensis H.W.Wang et R.X.Luan, sp.nov. They both have the morphological character that carpogonial ampullae and auxiliary cell ampullae are the simple Grateloupia-type. The two species can be distinguished from other species of the genus by their distinctive morphological features respectively. Bused on ribulose-l,5-bisphosphate carboxylase/oxygenase （rbcL） gene sequences, the phylogenetic tree obtained in the study indicated that they are both embedded within the Grateloupia clade. G. dalianensis clusters a subclade with G. asiatica, and G. yinggehaiensis forms a single monophyletic subclade with G. hawaiiana.
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).
