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phylogenetic incongruence in Cymbidium orchids

Plant Diversity 2021年第6期43卷 452-461页

作者： Guo-Qiang Zhang Gui-Zhen Chen Li-Jun Chen Jun-Wen Zhai Jie Huang Xin-Yi Wu Ming-He Li Dong-Hui Peng Wen-Hui Rao Zhong-Jian Liu Si-Ren Lan Forestry College of Fujian Agriculture and Forestry University Fuzhou350002China Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture Fujian Agriculture and Forestry UniversityFuzhou350002China Shenzhen Key Laboratory for Orchid Conservation and Utilization The National Orchid Conservation Center of China and the Orchid Conservation and Research Center of ShenzhenShenzhen518114China

Cymbidium,which includes approximately 80 species,is one of the most ornamental and cultivated orchid ***,a lack of markers and sparse sampling have posed great challenges to resolving the phylogenetic relationships within the *** the present study,we reconstructed the phylogenetic relationships by utilizing one nuclear DNA(nrITS)and seven plastid genes(rbcL,trnS,trnG,matK,trnL,psbA,and atpI)from 70 species(varieties)in *** also examined the occurrence of phylogenetic conflict between nuclear(nrITS)and plastid loci and investigated how phylogenetic conflict bears on taxonomic classification within the *** found that phylogenetic conflict and low support values may be explained by hybridization and a lack of informative *** results do not support previous classification of the subgenera and sections within *** between gene trees and network analysis indicate that reticulate evolution occurred in the genus ***,our study indicates that Cymbidium has undergone a complex evolution.

关键词： Cymbidium phylogenetic conflict nrITS cpDNA Reticulate evolution

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Phylogenomic analyses of Alismatales shed light into adaptations to aquatic environments

Phylogenomic analyses of Alismatales shed light into adaptat...

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首届植物科学前沿学术大会

作者：陈凌云卢蓓 Diego F.Morales-Briones Michael L.Moody 刘帆胡光万黄建勋陈进明王青锋中国科学院武汉植物园中国科学院中非联合研究中心中国药科大学中药学院 Department of Plant and Microbial Biology University of Minnesota Department of Biological Sciences University of Texas at El Paso 复旦大学生命科学院生物多样性和生态工程教育部重点实验室

Land plants first evolved from freshwater algae, and flowering plants returned to water as early as the Cretaceous and multiple times subsequently. Alismatales is the largest clade of aquatic angiosperms including all marine angiosperms, as well as terrestrial plants. We used Alismatales to explore plant adaptations to aquatic environments by analyzing a data set that included 95 samples(89 Alismatales species) covering four genomes and 91 transcriptomes(59 generated in this study). To provide a basis for investigating adaptations, we assessed phylogenetic conflict and wholegenome duplication(WGD) events in Alismatales. We recovered a relationship for the three main clades in Alismatales as(Tofieldiaceae, Araceae) + core Alismatids. We also found phylogenetic conflict among the three main clades that was best explained by incomplete lineage sorting and introgression. Overall, we identified 18 putative WGD events across Alismatales. One of them occurred at the most recent common ancestor of core Alismatids, and three occurred at seagrass lineages. We also found that lineage and life-form were both important for different evolutionary patterns for the genes related to freshwater and marine adaptation. For example, several light or ethylene-related genes were lost in the seagrass Zosteraceae, but are present in other seagrasses and freshwater species. Stomata-related genes were lost in both submersed freshwater species and seagrasses. Nicotianamine synthase genes, which are important in iron intake, expanded in both submersed freshwater species and seagrasses. Our results advance the understanding of the adaptation to aquatic environments and whole-genome duplications using phylogenomics.

关键词： Alismatales phylogenetic conflict adaptation whole-genome duplication marine angiosperms

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