The Experts below are selected from a list of 2823 Experts worldwide ranked by ideXlab platform
Ying Meng - One of the best experts on this subject based on the ideXlab platform.
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the biogeographic south north divide of Polygonatum asparagaceae tribe polygonateae within eastern asia and its recent dispersals in the northern hemisphere
PLOS ONE, 2016Co-Authors: Jiajian Wang, Ze-long Nie, Tao Deng, Jun Wen, Yongping Yang, Hang Sun, Ying MengAbstract:Eastern Asia (EA) is a key region for the diversification of flowering plants in the Northern Hemisphere, but few studies have focused on the biogeographic history within EA in the context of the other northern continents. Polygonatum is an important medicinal genus widely distributed in the Northern Hemisphere with its highest species richness in EA, and it represents an excellent model for studying the evolution of biogeographic patterns in this region. Divergence time estimation was used to examine the biogeographic history of Polygonatum based on nuclear ITS and four plastid sequences (rbcL, matK, psbA–trnH and trnC–petN) from 30 Polygonatum species and 35 outgroup taxa. The ancestral area of Polygonatum and subsequent dispersal routes were inferred using Bayes-Lagrange. Polygonatum was estimated to have originated in southern EA during the middle Miocene (14.34–13.57 Ma) with subsequent south-to-north expansion in the late Miocene. Multiple intercontinental dispersal events were inferred between EA and Europe or North America, and all of them have occurred recently in the late Miocene to Pliocene. The separation of Polygonatum into the south and north lineages and their subsequent diversifications in the late Miocene supports the existence of a biogeographic divide between the northern and southern parts of EA that also coincides with the retreat and redevelopment of the arid zone in EA in the Neogene. Our results demonstrate the complexity of biogeographic history of Polygonatum in the Northern Hemisphere including early vicariance followed by frequent and recent dispersals in the Neogene.
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Phylogenetics and evolution of phyllotaxy in the Solomon's seal genus Polygonatum (Asparagaceae: Polygonateae)
Botanical Journal of the Linnean Society, 2014Co-Authors: Ying Meng, Ze-long Nie, Tao Deng, Jun Wen, Yongping YangAbstract:Polygonatum is the largest and most complex genus in tribe Polygonateae, comprising approximately 57 species widely distributed in the warm temperate, subtropical and boreal zones of the Northern Hemisphere. However, phylogenetic relationships in the genus remain poorly understood. The objectives of this study were to reconstruct the phylogenetic relationships of the genus using four plastid markers, and to examine the evolution of leaf arrangement in Polygonatum in the phylogenetic context of its closely related taxa. Thirty Polygonatum species were sampled to infer phylogenetic relationships using maximum-likelihood and Bayesian analyses. The evolution of leaf arrangements was reconstructed using Bayesian, parsimony and likelihood methods. The phylogenetic analyses supported the current generic delimitation of Polygonatum, with HeteroPolygonatum recognized as a distinct genus. Three major lineages in Polygonatum were well supported, largely correlated with geographical distribution and the most recent classification at the sectional level. However, our results did not support the currently recognized series, especially the two large series Verticillata and Alternifolia.Bayesian analyses support the alternate-leaf arrangement as the ancestral state for Polygonatum, but parsimony and maximum-likelihood analyses suggest an equivocal state for crown Polygonatum. Leaf arrangement was found to be evolutionarily labile. A new nomenclatural combination was made: Polygonatum sectionSibirica (L.I.Abramova) Y.Meng, comb. nov.(c) 2014 The Linnean Society of London, Botanical Journal of the Linnean Society, 2014, 176, 435-451.
Yongping Yang - One of the best experts on this subject based on the ideXlab platform.
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the biogeographic south north divide of Polygonatum asparagaceae tribe polygonateae within eastern asia and its recent dispersals in the northern hemisphere
PLOS ONE, 2016Co-Authors: Jiajian Wang, Ze-long Nie, Tao Deng, Jun Wen, Yongping Yang, Hang Sun, Ying MengAbstract:Eastern Asia (EA) is a key region for the diversification of flowering plants in the Northern Hemisphere, but few studies have focused on the biogeographic history within EA in the context of the other northern continents. Polygonatum is an important medicinal genus widely distributed in the Northern Hemisphere with its highest species richness in EA, and it represents an excellent model for studying the evolution of biogeographic patterns in this region. Divergence time estimation was used to examine the biogeographic history of Polygonatum based on nuclear ITS and four plastid sequences (rbcL, matK, psbA–trnH and trnC–petN) from 30 Polygonatum species and 35 outgroup taxa. The ancestral area of Polygonatum and subsequent dispersal routes were inferred using Bayes-Lagrange. Polygonatum was estimated to have originated in southern EA during the middle Miocene (14.34–13.57 Ma) with subsequent south-to-north expansion in the late Miocene. Multiple intercontinental dispersal events were inferred between EA and Europe or North America, and all of them have occurred recently in the late Miocene to Pliocene. The separation of Polygonatum into the south and north lineages and their subsequent diversifications in the late Miocene supports the existence of a biogeographic divide between the northern and southern parts of EA that also coincides with the retreat and redevelopment of the arid zone in EA in the Neogene. Our results demonstrate the complexity of biogeographic history of Polygonatum in the Northern Hemisphere including early vicariance followed by frequent and recent dispersals in the Neogene.
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Phylogenetics and evolution of phyllotaxy in the Solomon's seal genus Polygonatum (Asparagaceae: Polygonateae)
Botanical Journal of the Linnean Society, 2014Co-Authors: Ying Meng, Ze-long Nie, Tao Deng, Jun Wen, Yongping YangAbstract:Polygonatum is the largest and most complex genus in tribe Polygonateae, comprising approximately 57 species widely distributed in the warm temperate, subtropical and boreal zones of the Northern Hemisphere. However, phylogenetic relationships in the genus remain poorly understood. The objectives of this study were to reconstruct the phylogenetic relationships of the genus using four plastid markers, and to examine the evolution of leaf arrangement in Polygonatum in the phylogenetic context of its closely related taxa. Thirty Polygonatum species were sampled to infer phylogenetic relationships using maximum-likelihood and Bayesian analyses. The evolution of leaf arrangements was reconstructed using Bayesian, parsimony and likelihood methods. The phylogenetic analyses supported the current generic delimitation of Polygonatum, with HeteroPolygonatum recognized as a distinct genus. Three major lineages in Polygonatum were well supported, largely correlated with geographical distribution and the most recent classification at the sectional level. However, our results did not support the currently recognized series, especially the two large series Verticillata and Alternifolia.Bayesian analyses support the alternate-leaf arrangement as the ancestral state for Polygonatum, but parsimony and maximum-likelihood analyses suggest an equivocal state for crown Polygonatum. Leaf arrangement was found to be evolutionarily labile. A new nomenclatural combination was made: Polygonatum sectionSibirica (L.I.Abramova) Y.Meng, comb. nov.(c) 2014 The Linnean Society of London, Botanical Journal of the Linnean Society, 2014, 176, 435-451.
Zhao Xiao - One of the best experts on this subject based on the ideXlab platform.
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Changes of Hippocampal Synaptophysin in Rats of Vascular Dementia and Drug Intervention
Journal of Fujian Medical University, 2003Co-Authors: Zhao XiaoAbstract:Objective\ To observe the change of hippocampal synaptophysin in female rats of vascular dementia and to study the effect of Polygonatum oral liquid on vascular dementia. \ Methods\ The animal model was reproduced by permanent occlusion of bilateral common carotid arteries of rats.\ Learning and memory of rats were tested by Morris water maze.\ Immunohistochemistry technique and images analysis were used to study the synaptophysin express in hippocampal formation.\ Results\ The synaptophysin immunolabeling density of hippocampal decreased in vascular dementia rats in comparison with normal rats.\ The expression of synaptophysin in rats that was treated by Polygonatum oral liquid was significantly higher than those in both vascular dementia rats and rats treated by saline.\ Moreover, the escape latency of rats is correlated with the synaptophysin immunolabeling density of hippocampal formation.\ Conclusion\ Polygonatum oral liquid display the function of improving synaptic remodelling and promotes learning and memory in rats with vascular dementia.\;
Jun Wen - One of the best experts on this subject based on the ideXlab platform.
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the biogeographic south north divide of Polygonatum asparagaceae tribe polygonateae within eastern asia and its recent dispersals in the northern hemisphere
PLOS ONE, 2016Co-Authors: Jiajian Wang, Ze-long Nie, Tao Deng, Jun Wen, Yongping Yang, Hang Sun, Ying MengAbstract:Eastern Asia (EA) is a key region for the diversification of flowering plants in the Northern Hemisphere, but few studies have focused on the biogeographic history within EA in the context of the other northern continents. Polygonatum is an important medicinal genus widely distributed in the Northern Hemisphere with its highest species richness in EA, and it represents an excellent model for studying the evolution of biogeographic patterns in this region. Divergence time estimation was used to examine the biogeographic history of Polygonatum based on nuclear ITS and four plastid sequences (rbcL, matK, psbA–trnH and trnC–petN) from 30 Polygonatum species and 35 outgroup taxa. The ancestral area of Polygonatum and subsequent dispersal routes were inferred using Bayes-Lagrange. Polygonatum was estimated to have originated in southern EA during the middle Miocene (14.34–13.57 Ma) with subsequent south-to-north expansion in the late Miocene. Multiple intercontinental dispersal events were inferred between EA and Europe or North America, and all of them have occurred recently in the late Miocene to Pliocene. The separation of Polygonatum into the south and north lineages and their subsequent diversifications in the late Miocene supports the existence of a biogeographic divide between the northern and southern parts of EA that also coincides with the retreat and redevelopment of the arid zone in EA in the Neogene. Our results demonstrate the complexity of biogeographic history of Polygonatum in the Northern Hemisphere including early vicariance followed by frequent and recent dispersals in the Neogene.
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Phylogenetics and evolution of phyllotaxy in the Solomon's seal genus Polygonatum (Asparagaceae: Polygonateae)
Botanical Journal of the Linnean Society, 2014Co-Authors: Ying Meng, Ze-long Nie, Tao Deng, Jun Wen, Yongping YangAbstract:Polygonatum is the largest and most complex genus in tribe Polygonateae, comprising approximately 57 species widely distributed in the warm temperate, subtropical and boreal zones of the Northern Hemisphere. However, phylogenetic relationships in the genus remain poorly understood. The objectives of this study were to reconstruct the phylogenetic relationships of the genus using four plastid markers, and to examine the evolution of leaf arrangement in Polygonatum in the phylogenetic context of its closely related taxa. Thirty Polygonatum species were sampled to infer phylogenetic relationships using maximum-likelihood and Bayesian analyses. The evolution of leaf arrangements was reconstructed using Bayesian, parsimony and likelihood methods. The phylogenetic analyses supported the current generic delimitation of Polygonatum, with HeteroPolygonatum recognized as a distinct genus. Three major lineages in Polygonatum were well supported, largely correlated with geographical distribution and the most recent classification at the sectional level. However, our results did not support the currently recognized series, especially the two large series Verticillata and Alternifolia.Bayesian analyses support the alternate-leaf arrangement as the ancestral state for Polygonatum, but parsimony and maximum-likelihood analyses suggest an equivocal state for crown Polygonatum. Leaf arrangement was found to be evolutionarily labile. A new nomenclatural combination was made: Polygonatum sectionSibirica (L.I.Abramova) Y.Meng, comb. nov.(c) 2014 The Linnean Society of London, Botanical Journal of the Linnean Society, 2014, 176, 435-451.
Tao Deng - One of the best experts on this subject based on the ideXlab platform.
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the biogeographic south north divide of Polygonatum asparagaceae tribe polygonateae within eastern asia and its recent dispersals in the northern hemisphere
PLOS ONE, 2016Co-Authors: Jiajian Wang, Ze-long Nie, Tao Deng, Jun Wen, Yongping Yang, Hang Sun, Ying MengAbstract:Eastern Asia (EA) is a key region for the diversification of flowering plants in the Northern Hemisphere, but few studies have focused on the biogeographic history within EA in the context of the other northern continents. Polygonatum is an important medicinal genus widely distributed in the Northern Hemisphere with its highest species richness in EA, and it represents an excellent model for studying the evolution of biogeographic patterns in this region. Divergence time estimation was used to examine the biogeographic history of Polygonatum based on nuclear ITS and four plastid sequences (rbcL, matK, psbA–trnH and trnC–petN) from 30 Polygonatum species and 35 outgroup taxa. The ancestral area of Polygonatum and subsequent dispersal routes were inferred using Bayes-Lagrange. Polygonatum was estimated to have originated in southern EA during the middle Miocene (14.34–13.57 Ma) with subsequent south-to-north expansion in the late Miocene. Multiple intercontinental dispersal events were inferred between EA and Europe or North America, and all of them have occurred recently in the late Miocene to Pliocene. The separation of Polygonatum into the south and north lineages and their subsequent diversifications in the late Miocene supports the existence of a biogeographic divide between the northern and southern parts of EA that also coincides with the retreat and redevelopment of the arid zone in EA in the Neogene. Our results demonstrate the complexity of biogeographic history of Polygonatum in the Northern Hemisphere including early vicariance followed by frequent and recent dispersals in the Neogene.
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Phylogenetics and evolution of phyllotaxy in the Solomon's seal genus Polygonatum (Asparagaceae: Polygonateae)
Botanical Journal of the Linnean Society, 2014Co-Authors: Ying Meng, Ze-long Nie, Tao Deng, Jun Wen, Yongping YangAbstract:Polygonatum is the largest and most complex genus in tribe Polygonateae, comprising approximately 57 species widely distributed in the warm temperate, subtropical and boreal zones of the Northern Hemisphere. However, phylogenetic relationships in the genus remain poorly understood. The objectives of this study were to reconstruct the phylogenetic relationships of the genus using four plastid markers, and to examine the evolution of leaf arrangement in Polygonatum in the phylogenetic context of its closely related taxa. Thirty Polygonatum species were sampled to infer phylogenetic relationships using maximum-likelihood and Bayesian analyses. The evolution of leaf arrangements was reconstructed using Bayesian, parsimony and likelihood methods. The phylogenetic analyses supported the current generic delimitation of Polygonatum, with HeteroPolygonatum recognized as a distinct genus. Three major lineages in Polygonatum were well supported, largely correlated with geographical distribution and the most recent classification at the sectional level. However, our results did not support the currently recognized series, especially the two large series Verticillata and Alternifolia.Bayesian analyses support the alternate-leaf arrangement as the ancestral state for Polygonatum, but parsimony and maximum-likelihood analyses suggest an equivocal state for crown Polygonatum. Leaf arrangement was found to be evolutionarily labile. A new nomenclatural combination was made: Polygonatum sectionSibirica (L.I.Abramova) Y.Meng, comb. nov.(c) 2014 The Linnean Society of London, Botanical Journal of the Linnean Society, 2014, 176, 435-451.
