Fossil Sequoia in Yunnan Province, China during the Miocene is here reported for the first time. The morphological features of shoots and cuticle are described. Its historical and geological distribution is also discu...Fossil Sequoia in Yunnan Province, China during the Miocene is here reported for the first time. The morphological features of shoots and cuticle are described. Its historical and geological distribution is also discussed. According to the characteristics of the assemblage of spore and pollen in the fossil collection site and the nature environment of the native S. sempervirens lived in American, the discovery of the fossil Sequoia indicated the presence of moist subtropical climate in Yunnan Province during the Miocene.展开更多
Due to differences in morphology, ecology and biology, the phylogenesis of Coniferopsida and Taxaceae remains controversial, and the phylogenetic relationship of Pseudotaxus is yet to be confirmed. Three rDNA regions,...Due to differences in morphology, ecology and biology, the phylogenesis of Coniferopsida and Taxaceae remains controversial, and the phylogenetic relationship of Pseudotaxus is yet to be confirmed. Three rDNA regions, ITS1, 5.8S rDNA, and ITS2, were prepared for 77 species belonging to seven families of Coniferopsida, including Taxaceae. Maximum parsimony(MP)and Neighbor-joining(NJ) analyses were performed. Results showed that:(1) the Coniferopsida species formed three branches:(Taxaceae, Cephalotaxaceae, Cupressaceae, Taxodiaceae),(Araucariaceae, Podocarpaceae), and(Pinaceae);(2) Taxaceae included Taxus, Pseudotaxus, Amentotaxus, and Torreya; and(3) Pseudotaxus belonged to Taxaceae, with a support rate of 97%in MP analyses and 99% in NJ analyses.展开更多
文摘Fossil Sequoia in Yunnan Province, China during the Miocene is here reported for the first time. The morphological features of shoots and cuticle are described. Its historical and geological distribution is also discussed. According to the characteristics of the assemblage of spore and pollen in the fossil collection site and the nature environment of the native S. sempervirens lived in American, the discovery of the fossil Sequoia indicated the presence of moist subtropical climate in Yunnan Province during the Miocene.
文摘Due to differences in morphology, ecology and biology, the phylogenesis of Coniferopsida and Taxaceae remains controversial, and the phylogenetic relationship of Pseudotaxus is yet to be confirmed. Three rDNA regions, ITS1, 5.8S rDNA, and ITS2, were prepared for 77 species belonging to seven families of Coniferopsida, including Taxaceae. Maximum parsimony(MP)and Neighbor-joining(NJ) analyses were performed. Results showed that:(1) the Coniferopsida species formed three branches:(Taxaceae, Cephalotaxaceae, Cupressaceae, Taxodiaceae),(Araucariaceae, Podocarpaceae), and(Pinaceae);(2) Taxaceae included Taxus, Pseudotaxus, Amentotaxus, and Torreya; and(3) Pseudotaxus belonged to Taxaceae, with a support rate of 97%in MP analyses and 99% in NJ analyses.
