The leaf muntjac （Muntiacus putaoensis） is an endemic deer species found in the east trans- Himalayan region. In recent years, population numbers have decreased due to heavy hunting and habitat loss, and little gene...The leaf muntjac （Muntiacus putaoensis） is an endemic deer species found in the east trans- Himalayan region. In recent years, population numbers have decreased due to heavy hunting and habitat loss, and little genetic data exists for this species, thus our knowledge of distribution rangs and population sizes likewise remain limited. We obtained mtDNA genes and the complete mitochondrial genome sequence of M. putaoensis using PCR, followed by direct sequencing. The complete mitogenome sequence was determined as a circular 16 349 bp mitochondrial genome, containing 13 protein-coding genes, two rRNA genes 22 tRNA genes, and one control region, the gene composition and order of which were similar to most other vertebrates so far reported. Most mitochondrial genes, except for ND6 and eight tRNAs, were encoded on the heavy strand. The overall base composition of the heavy strand was 33.1% A, 29.3% T, 24.2% C, and 13.4% G, with a strong AT bias of 62.4%. There were seven regions of gene overlap totaling 95 bp and 11 intergenic spacer regions totaling 74 bp. Phylogenetic analyses （ML and BI） among the Muntiacus genus based on the sequenced of mitogenome and ND4L-ND4 supported M. putaoensis as a member of Muntiacus, most closely related to M. vuquangensis. However, when analyses based on cyt b included two more muntjacs, M. truongsonensis was most closely related to M. putaoensis rather than M. vuquangensis, and together with M. rooseveltorum, likely forming a M. rooseveltorum complex of the species. This study will help in the exploration of the evolutionary history and taxonomic status of the leaf muntjac, as well as its protection as a genetic resource.展开更多
Dengue virus(DENV)is one of the most important arboviral pathogens in the tropics and subtropics,and nearly one-third of the world's population is at risk of infection.The transmission of DENV involves a sylvatic ...Dengue virus(DENV)is one of the most important arboviral pathogens in the tropics and subtropics,and nearly one-third of the world's population is at risk of infection.The transmission of DENV involves a sylvatic cycle between nonhuman primates(NHP)and Aedes genus mosquitoes,and an endemic cycle between human hosts and predominantly Aedes aegypti.DENV belongs to the genus Flavivirus of the family Flaviviridae and consists of four antigenically distinct serotypes(DENV-1-4).Phylogenetic analyses of DENV have revealed its origin,epidemiology,and the drivers that determine its molecular evolution in nature.This review discusses how phyloge-netic research has improved our understanding of DENV evolution and how it affects viral ecology and improved our ability to analyze and predict future DENV emergence.展开更多
Understanding the level of genetic diversity in any population is an important requisite towards strategizing measures for conservation and improvement of stocks. This study focused on the assessment of phylogenetics ...Understanding the level of genetic diversity in any population is an important requisite towards strategizing measures for conservation and improvement of stocks. This study focused on the assessment of phylogenetics and molecular divergence of tilapia fish species obtained from two populations (Domita in South-South and Odeda in South-West, Nigeria) using the displacement loop (D-loop) and cytochrome b region of the mitochondrial deoxyribonucleic acid (mtDNA). A total of 28 samples (15 from South-South and 13 from South-West) were used for the genetic analysis. DNA was extracted from the tissue of all the samples using Quik-gDNATM miniPrep kit. The D-loop containing the hypervariable region was sequenced for all samples from the two populations, while cytochrome b (Cyt b) region of mtDNA was only sequenced for samples from South-South population. Chromatograms of the sequences were viewed and edited using Bioedit software. Multiple sequence alignment was carried out using molecular evolutionary genetic analysis (MEGA) software before subsequent genetic analyses. Phylogenetic analysis grouped the samples into two clusters based on population. Also, when the two mitochondrial regions were pooled together, they clustered into two major groups based on mitochondrial regions. Analysis of molecular variance (AMOVA) revealed 37.32% variation within population and 62.68% variation among population with a significant fixation index of 0.627 (p 0.05). The genetic distance inferred between D-loop regions of South-South and South-West populations was 0.243. Maternal lineage analysis revealed that the origin of tilapia fish from both populations could be traced to Oreochromis spirilus and Oreochromis leucostictus based on mitochondrial D-loop region. The findings of this study revealed molecular divergence among the tilapia populations and may serve as pivot information for the genetic improvement of this important species.展开更多
The molecular phylogenetics of the Lepidoptera （butterflies and moths） is well studied, but that of Trichoptera （caddisflies）, the sister clade of Lepidoptera, is less studied. The PCR primer libraries developed f...The molecular phylogenetics of the Lepidoptera （butterflies and moths） is well studied, but that of Trichoptera （caddisflies）, the sister clade of Lepidoptera, is less studied. The PCR primer libraries developed for lepidopteran phylogenetics might work in Trichoptera. DNA from 8 caddisfly species （Asynarchus nigriculus （Banks, 1908）, Grammotaulius lorettae Denning, 1941, Hesperophylax occidentalis （Banks, 1908）, Limnephilus externus Hagen, 1861, Limnephilus picturatus McLachlan, 1875, Limnephilus secludens Banks, 1914, Limnephilus sublunatus Provancher, 1877 and Agrypnia deflata （Milne, 1931）） was used to screen for amplification. 107 primer pairs for 45 nuclear and 3 mitochondrial genes were tested. Primers for 1 new gene （40S ribosomalprotein $2 （RPS2）） and 8 genes previously used in Trichopteran phylogenetics were recovered （16S rRNA, 18S rRNA, carbamoyl-phosphate synthetase （CAD）, cytoehrome oxidase I （CO1）, cytochrome oxidase 11 （COIl）, elongation factor-1 alpha （EF-1 alpha）, isoeitrate dehydrogenase （IDH）, and RNA polymerase-II （POL-I1））. New primer pairs extended the genomic region sampled for many genes. Evolution rates among loci varied by 2 orders of magnitude. Differences among evolution rates and modes of inheritance offer flexible tools for resolving phylogenetic questions and examining genome evolution in the Trichoptera. Screening libraries of PCR primers is a useful approach for identifying PCR primers in related taxa with limited molecular genetic resources.展开更多
This study describes Rhabdophis shuichengensis sp.nov.a new species from Guizhou Province,China.This new species is distinguished from other congeners by the following characters:(1)medium-sized body(SVL of adult male...This study describes Rhabdophis shuichengensis sp.nov.a new species from Guizhou Province,China.This new species is distinguished from other congeners by the following characters:(1)medium-sized body(SVL of adult males:579-643 mm and adult females:530 mm);(2)uniformly grayish brown above,black line below eye and between last two labials absent;(3)dorsal scale rows of 15-15-15;(4)ventral scales of 154-158;(5)subcaudal scales of 43-56;(6)supralabials scales 6;(7)infralabials scales 8;(8)preoculars scales 1,postoculars scales 3,and supraocular scales 1;(9)temporal scales 1+2;(10)dorsal scales are keeled,with uppermost 5 rows feebly keeled;(11)abruptly enlarged,blade-shaped posterior two maxillary teeth,not preceded by a diastema and maxillary tooth count 20-22(18-20+2).The description of this new species brings the total number of described species of this genus to 35 and represents the 14th known Rhabdophis species in China.展开更多
Background The bromodomain(BRD) proteins play a pivotal role in regulating gene expression by recognizing acetylated lysine residues and acting as chromatin-associated post-translational modification-inducing proteins...Background The bromodomain(BRD) proteins play a pivotal role in regulating gene expression by recognizing acetylated lysine residues and acting as chromatin-associated post-translational modification-inducing proteins. Although BRD proteins have been extensively studied in mammals, they have also been characterized in plants like Arabidopsis thaliana and Oryza sativa, where they regulate stress-responsive genes related to drought, salinity, and cold. However, their roles in cotton species remain unexplored.Results In this genome-wide comparative analysis, 145 BRD genes were identified in the tetraploid species(Gossypium hirsutum and G. barbadense), compared with 82 BRD genes in their diploid progenitors(G. arboreum and G. raimondii), indicating that polyploidization significantly influenced BRD gene evolution. Gene duplication analysis revealed 78.85% of duplications were segmental and 21.15% were tandem among 104 in-paralogous gene pairs, contributing to BRD gene expansion. Gene structure, motif, and domain analyses demonstrated that most genes were intron-less and conserved throughout evolution. Syntenic analysis revealed a greater number of orthologous gene pairs in the Dt sub-genome than in the At sub-genome. The abundance of regulatory, hormonal, and defense-related cis-regulatory elements in the promoter region suggests that BRD genes play a role in both biotic and abiotic stress responses. Protein-protein interaction analysis indicated that global transcription factor group E(GTE) transcription factors regulate BRD genes. Expression analysis revealed that BRD genes are predominantly involved in ovule development, with some genes displaying specific expression patterns under heat, cold, and salt stress. Furthermore, qRT-PCR analysis demonstrated significant differential expression of BRD genes between the tolerant and sensitive genotype, underscoring their potential role in mediating drought and salinity stress responses.Conclusions This study provides valuable insights into the evolution of BRD genes across species and their roles in abiotic stress tolerance, highlighting their potential in breeding programs to develop drought and salinity tolerant cotton varieties.展开更多
The flora of China is well known for its high diversity and endemism. Identifying centers of endemism and designating conservation priorities are essential goals for biodiversity studies.However, there is no comprehen...The flora of China is well known for its high diversity and endemism. Identifying centers of endemism and designating conservation priorities are essential goals for biodiversity studies.However, there is no comprehensive study from a rigorous phylogenetic perspective to understand patterns of diversity and endemism and to guide biodiversity conservation in China. We conducted a spatial phylogenetic analysis of the Chinese angiosperm flora at the generic level to identify centers of neo-and paleoendemism. Our results indicate that:(i) themajority of grid cells in China with significantly high phylogenetic endemism(PE) were located in the mountainous regions;(ii) four of the nine centers of endemism recognized, located in northern and western China, were recognized for the first time;(iii) arid and semiarid regions in Northwest China were commonly linked to significant PE, consistent with other spatial phylogenetic studies worldwide;and(iv) six highpriority conservation gaps were detected by overlaying the boundaries of China’s nature reserves on all significant PE cells. Overall, we conclude that the mountains of southern and northern China contain both paleo-endemics(ancient relictual lineages) and neo-endemics(recently diverged lineages). The areas we highlight as conservation priorities are important for broad-scale planning, especially in the context of evolutionary history preservation.展开更多
Despite worldwide distribution and rich diversity,the knowledge of mitochondrial genome(mtgenome)characteristics within the family Tenebrionidae(Coleoptera)is still very limited,and phylogenetics remain unresolved for...Despite worldwide distribution and rich diversity,the knowledge of mitochondrial genome(mtgenome)characteristics within the family Tenebrionidae(Coleoptera)is still very limited,and phylogenetics remain unresolved for the family.In this study,the mtgenomes for 12 species are newly sequenced and annotated.Three of the species represent the first report of complete mtgenomes from the subfamily Alleculinae.Comparative analysis of 36 tenebrionid mtgenomes finds that gene composition and order are the same as a theoretical ancestral insect mtgenome,and AT bias,length variation,and codon usage are consistent with other reported beetle mtgenomes.Some intergenic overlap and gap sequences may contain phylogenetically informative information,whereas neither the conserved nor repeat sequences in the control region do.The subfamilies Lagriinae,Pimeliinae,Stenochiinae,and Alleculinae are found to be monophyletic,and the subfamilies Diaperinae and Tenebrioninae polyphyletic in our study.Furthermore,Lagriinae is sister to the rest of the subfamilies.At the tribal level,the tribes Lagriini in the subfamily Lagrrinae;Strongyliini in Stenochiinae;Cteniopodini in Alleculinae;and Triboliini,Opatrini,and Amarygmini in Tenebrioninae are monophyletic;while Diaperini in Diaperinae,and Tenebrionini in Tenebrioninae are polyphyletic.展开更多
Correct combination of plastid(cp)and nuclear(nr)DNA data for plant phylogenetic reconstructions is not a new issue,but with an increasing number of nrDNA loci being used,it is of ever greater practical concern.For ac...Correct combination of plastid(cp)and nuclear(nr)DNA data for plant phylogenetic reconstructions is not a new issue,but with an increasing number of nrDNA loci being used,it is of ever greater practical concern.For accurately reconstructing the phylogeny and evolutionary history of plant groups,correct treatment of phylogenetic incongruence is a vital step in the proper analysis of cpDNA and nrDNA data.We first evaluated the current status of analyzing cpDNA and nrDNA data by searching all articles published in the journal Systematic Botany between 2005 and 2011.Many studies combining cpDNA and nrDNA data did not rigorously assess the combinability of the data sets,or did not address in detail possible reasons for incongruence between the two data sets.By reviewing various methods,we outline a procedure to more accurately analyze and/or combine cpDNA and nrDNA data,which includes four steps:identifying significant incongruence,determining conflicting taxa,providing possible interpretations for incongruence,and reconstructing the phylogeny after treating incongruence.Particular attention is given to explanation of the cause of incongruence.We hope that our procedure will help raise awareness of the importance of rigorous analysis and help identify the cause of incongruence before combining cpDNA and nrDNA data.展开更多
The current journal is mainly focused in zoological systematics.According to Systematics Agenda 2000 (1994),systematics is the science built on the following tasks:Taxonomy—the science of discovering,describing,and c...The current journal is mainly focused in zoological systematics.According to Systematics Agenda 2000 (1994),systematics is the science built on the following tasks:Taxonomy—the science of discovering,describing,and classifying species or groups of species(together termed taxa);Phylogenetic analysis—the discovery of the evolutionary relationships among a group of species;and Classification—the grouping of species,ultimately on the basis of evolutionary relationships.展开更多
基金supported by a grant from the Southeast Asia Biodiversity Research Institute,Chinese Academy of Sciences(Y4ZK111B01)
文摘The leaf muntjac （Muntiacus putaoensis） is an endemic deer species found in the east trans- Himalayan region. In recent years, population numbers have decreased due to heavy hunting and habitat loss, and little genetic data exists for this species, thus our knowledge of distribution rangs and population sizes likewise remain limited. We obtained mtDNA genes and the complete mitochondrial genome sequence of M. putaoensis using PCR, followed by direct sequencing. The complete mitogenome sequence was determined as a circular 16 349 bp mitochondrial genome, containing 13 protein-coding genes, two rRNA genes 22 tRNA genes, and one control region, the gene composition and order of which were similar to most other vertebrates so far reported. Most mitochondrial genes, except for ND6 and eight tRNAs, were encoded on the heavy strand. The overall base composition of the heavy strand was 33.1% A, 29.3% T, 24.2% C, and 13.4% G, with a strong AT bias of 62.4%. There were seven regions of gene overlap totaling 95 bp and 11 intergenic spacer regions totaling 74 bp. Phylogenetic analyses （ML and BI） among the Muntiacus genus based on the sequenced of mitogenome and ND4L-ND4 supported M. putaoensis as a member of Muntiacus, most closely related to M. vuquangensis. However, when analyses based on cyt b included two more muntjacs, M. truongsonensis was most closely related to M. putaoensis rather than M. vuquangensis, and together with M. rooseveltorum, likely forming a M. rooseveltorum complex of the species. This study will help in the exploration of the evolutionary history and taxonomic status of the leaf muntjac, as well as its protection as a genetic resource.
基金National Key Research and Development Plan of China,Grant/Award Number:2018YFA0507202,2020YFC1200100 and 2021YFC2300200National Natural Science Foundation of China,Grant/Award Number:31825001,32188101,81730063,81961160737 and 82102389+5 种基金Provincial Innovation Team for the Prevention and Control of Highly Pathogenic Pathogens,Institute of Medical Biology,Chinese Academy of Medical Sciences,Grant/Award Number:202105AE160020Shenzhen San-Ming Project for Prevention and Research on Vector-borne Diseases,Grant/Award Number:SZSM201611064Shenzhen Science and Technology Project,Grant/Award Number:JSGG20191129144225464Tsinghua University Spring Breeze Fund,Grant/Award Number:2020Z99CFG017Young Elite Scientists Sponsorship Program,Grant/Award Number:2021QNRC001Yunnan Cheng Gong Expert Work-Station,Grant/Award Number:202005AF150034。
文摘Dengue virus(DENV)is one of the most important arboviral pathogens in the tropics and subtropics,and nearly one-third of the world's population is at risk of infection.The transmission of DENV involves a sylvatic cycle between nonhuman primates(NHP)and Aedes genus mosquitoes,and an endemic cycle between human hosts and predominantly Aedes aegypti.DENV belongs to the genus Flavivirus of the family Flaviviridae and consists of four antigenically distinct serotypes(DENV-1-4).Phylogenetic analyses of DENV have revealed its origin,epidemiology,and the drivers that determine its molecular evolution in nature.This review discusses how phyloge-netic research has improved our understanding of DENV evolution and how it affects viral ecology and improved our ability to analyze and predict future DENV emergence.
文摘Understanding the level of genetic diversity in any population is an important requisite towards strategizing measures for conservation and improvement of stocks. This study focused on the assessment of phylogenetics and molecular divergence of tilapia fish species obtained from two populations (Domita in South-South and Odeda in South-West, Nigeria) using the displacement loop (D-loop) and cytochrome b region of the mitochondrial deoxyribonucleic acid (mtDNA). A total of 28 samples (15 from South-South and 13 from South-West) were used for the genetic analysis. DNA was extracted from the tissue of all the samples using Quik-gDNATM miniPrep kit. The D-loop containing the hypervariable region was sequenced for all samples from the two populations, while cytochrome b (Cyt b) region of mtDNA was only sequenced for samples from South-South population. Chromatograms of the sequences were viewed and edited using Bioedit software. Multiple sequence alignment was carried out using molecular evolutionary genetic analysis (MEGA) software before subsequent genetic analyses. Phylogenetic analysis grouped the samples into two clusters based on population. Also, when the two mitochondrial regions were pooled together, they clustered into two major groups based on mitochondrial regions. Analysis of molecular variance (AMOVA) revealed 37.32% variation within population and 62.68% variation among population with a significant fixation index of 0.627 (p 0.05). The genetic distance inferred between D-loop regions of South-South and South-West populations was 0.243. Maternal lineage analysis revealed that the origin of tilapia fish from both populations could be traced to Oreochromis spirilus and Oreochromis leucostictus based on mitochondrial D-loop region. The findings of this study revealed molecular divergence among the tilapia populations and may serve as pivot information for the genetic improvement of this important species.
基金provided by a University of Manitoba Graduate Fellowshipthe University of Manitoba Research Grants Program+3 种基金the Field Work Support Program of the Faculty of Science at the University of Manitobaa Rocky Mountain Biological Laboratory Research Fellowshipan NSERC Discovery Grant RGPIN386337-2011a Canada Foundation for Innovation Award
文摘The molecular phylogenetics of the Lepidoptera （butterflies and moths） is well studied, but that of Trichoptera （caddisflies）, the sister clade of Lepidoptera, is less studied. The PCR primer libraries developed for lepidopteran phylogenetics might work in Trichoptera. DNA from 8 caddisfly species （Asynarchus nigriculus （Banks, 1908）, Grammotaulius lorettae Denning, 1941, Hesperophylax occidentalis （Banks, 1908）, Limnephilus externus Hagen, 1861, Limnephilus picturatus McLachlan, 1875, Limnephilus secludens Banks, 1914, Limnephilus sublunatus Provancher, 1877 and Agrypnia deflata （Milne, 1931）） was used to screen for amplification. 107 primer pairs for 45 nuclear and 3 mitochondrial genes were tested. Primers for 1 new gene （40S ribosomalprotein $2 （RPS2）） and 8 genes previously used in Trichopteran phylogenetics were recovered （16S rRNA, 18S rRNA, carbamoyl-phosphate synthetase （CAD）, cytoehrome oxidase I （CO1）, cytochrome oxidase 11 （COIl）, elongation factor-1 alpha （EF-1 alpha）, isoeitrate dehydrogenase （IDH）, and RNA polymerase-II （POL-I1））. New primer pairs extended the genomic region sampled for many genes. Evolution rates among loci varied by 2 orders of magnitude. Differences among evolution rates and modes of inheritance offer flexible tools for resolving phylogenetic questions and examining genome evolution in the Trichoptera. Screening libraries of PCR primers is a useful approach for identifying PCR primers in related taxa with limited molecular genetic resources.
文摘This study describes Rhabdophis shuichengensis sp.nov.a new species from Guizhou Province,China.This new species is distinguished from other congeners by the following characters:(1)medium-sized body(SVL of adult males:579-643 mm and adult females:530 mm);(2)uniformly grayish brown above,black line below eye and between last two labials absent;(3)dorsal scale rows of 15-15-15;(4)ventral scales of 154-158;(5)subcaudal scales of 43-56;(6)supralabials scales 6;(7)infralabials scales 8;(8)preoculars scales 1,postoculars scales 3,and supraocular scales 1;(9)temporal scales 1+2;(10)dorsal scales are keeled,with uppermost 5 rows feebly keeled;(11)abruptly enlarged,blade-shaped posterior two maxillary teeth,not preceded by a diastema and maxillary tooth count 20-22(18-20+2).The description of this new species brings the total number of described species of this genus to 35 and represents the 14th known Rhabdophis species in China.
文摘Background The bromodomain(BRD) proteins play a pivotal role in regulating gene expression by recognizing acetylated lysine residues and acting as chromatin-associated post-translational modification-inducing proteins. Although BRD proteins have been extensively studied in mammals, they have also been characterized in plants like Arabidopsis thaliana and Oryza sativa, where they regulate stress-responsive genes related to drought, salinity, and cold. However, their roles in cotton species remain unexplored.Results In this genome-wide comparative analysis, 145 BRD genes were identified in the tetraploid species(Gossypium hirsutum and G. barbadense), compared with 82 BRD genes in their diploid progenitors(G. arboreum and G. raimondii), indicating that polyploidization significantly influenced BRD gene evolution. Gene duplication analysis revealed 78.85% of duplications were segmental and 21.15% were tandem among 104 in-paralogous gene pairs, contributing to BRD gene expansion. Gene structure, motif, and domain analyses demonstrated that most genes were intron-less and conserved throughout evolution. Syntenic analysis revealed a greater number of orthologous gene pairs in the Dt sub-genome than in the At sub-genome. The abundance of regulatory, hormonal, and defense-related cis-regulatory elements in the promoter region suggests that BRD genes play a role in both biotic and abiotic stress responses. Protein-protein interaction analysis indicated that global transcription factor group E(GTE) transcription factors regulate BRD genes. Expression analysis revealed that BRD genes are predominantly involved in ovule development, with some genes displaying specific expression patterns under heat, cold, and salt stress. Furthermore, qRT-PCR analysis demonstrated significant differential expression of BRD genes between the tolerant and sensitive genotype, underscoring their potential role in mediating drought and salinity stress responses.Conclusions This study provides valuable insights into the evolution of BRD genes across species and their roles in abiotic stress tolerance, highlighting their potential in breeding programs to develop drought and salinity tolerant cotton varieties.
基金supported by grants from the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB31000000 and XDA19050103)the International Partnership Program of the Chinese Academy of Sciences(151853KYSB20190027)+4 种基金the National Natural Science Foundation of China(NNSF31800178,31870506,and 32122009)the Sino-Africa Joint Research Center,the Chinese Academy of Sciences CAS International Research and Education Development Program(SAJC202101)the Jiangsu Natural Science Foundation(BK20181398)the Hundred Talents Program of CAS(Y8C3041100)supported in part by the Young Elite Scientists Sponsorship Program by China Association for Science and Technology(2018QNRC001)。
文摘The flora of China is well known for its high diversity and endemism. Identifying centers of endemism and designating conservation priorities are essential goals for biodiversity studies.However, there is no comprehensive study from a rigorous phylogenetic perspective to understand patterns of diversity and endemism and to guide biodiversity conservation in China. We conducted a spatial phylogenetic analysis of the Chinese angiosperm flora at the generic level to identify centers of neo-and paleoendemism. Our results indicate that:(i) themajority of grid cells in China with significantly high phylogenetic endemism(PE) were located in the mountainous regions;(ii) four of the nine centers of endemism recognized, located in northern and western China, were recognized for the first time;(iii) arid and semiarid regions in Northwest China were commonly linked to significant PE, consistent with other spatial phylogenetic studies worldwide;and(iv) six highpriority conservation gaps were detected by overlaying the boundaries of China’s nature reserves on all significant PE cells. Overall, we conclude that the mountains of southern and northern China contain both paleo-endemics(ancient relictual lineages) and neo-endemics(recently diverged lineages). The areas we highlight as conservation priorities are important for broad-scale planning, especially in the context of evolutionary history preservation.
基金This research was supported by the following.The National Natural Science Foundation of China(31872262,31672363)National Key Program of Science and Technology Foundation Work of China(2015FY210300).Conccived and designed the research:BC,CW.Per-formed the specimens cllecting and experiments:BC,YZ,TT,TIL.Analyzed the data and wrote the paper:CW,BC.
文摘Despite worldwide distribution and rich diversity,the knowledge of mitochondrial genome(mtgenome)characteristics within the family Tenebrionidae(Coleoptera)is still very limited,and phylogenetics remain unresolved for the family.In this study,the mtgenomes for 12 species are newly sequenced and annotated.Three of the species represent the first report of complete mtgenomes from the subfamily Alleculinae.Comparative analysis of 36 tenebrionid mtgenomes finds that gene composition and order are the same as a theoretical ancestral insect mtgenome,and AT bias,length variation,and codon usage are consistent with other reported beetle mtgenomes.Some intergenic overlap and gap sequences may contain phylogenetically informative information,whereas neither the conserved nor repeat sequences in the control region do.The subfamilies Lagriinae,Pimeliinae,Stenochiinae,and Alleculinae are found to be monophyletic,and the subfamilies Diaperinae and Tenebrioninae polyphyletic in our study.Furthermore,Lagriinae is sister to the rest of the subfamilies.At the tribal level,the tribes Lagriini in the subfamily Lagrrinae;Strongyliini in Stenochiinae;Cteniopodini in Alleculinae;and Triboliini,Opatrini,and Amarygmini in Tenebrioninae are monophyletic;while Diaperini in Diaperinae,and Tenebrionini in Tenebrioninae are polyphyletic.
基金supported by the National Natural Science Foundation of China (31270269,30800059,30990241)the Knowledge Innovation Program of the Chinese Academy of Sciences (KSCX2-EW-Z-2)
文摘Correct combination of plastid(cp)and nuclear(nr)DNA data for plant phylogenetic reconstructions is not a new issue,but with an increasing number of nrDNA loci being used,it is of ever greater practical concern.For accurately reconstructing the phylogeny and evolutionary history of plant groups,correct treatment of phylogenetic incongruence is a vital step in the proper analysis of cpDNA and nrDNA data.We first evaluated the current status of analyzing cpDNA and nrDNA data by searching all articles published in the journal Systematic Botany between 2005 and 2011.Many studies combining cpDNA and nrDNA data did not rigorously assess the combinability of the data sets,or did not address in detail possible reasons for incongruence between the two data sets.By reviewing various methods,we outline a procedure to more accurately analyze and/or combine cpDNA and nrDNA data,which includes four steps:identifying significant incongruence,determining conflicting taxa,providing possible interpretations for incongruence,and reconstructing the phylogeny after treating incongruence.Particular attention is given to explanation of the cause of incongruence.We hope that our procedure will help raise awareness of the importance of rigorous analysis and help identify the cause of incongruence before combining cpDNA and nrDNA data.
文摘The current journal is mainly focused in zoological systematics.According to Systematics Agenda 2000 (1994),systematics is the science built on the following tasks:Taxonomy—the science of discovering,describing,and classifying species or groups of species(together termed taxa);Phylogenetic analysis—the discovery of the evolutionary relationships among a group of species;and Classification—the grouping of species,ultimately on the basis of evolutionary relationships.
