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| 1 | Congruent species delimitation of two controversial gold-thread nanmu tree species based on morphological and restriction site-associated DNA sequencing data显示文摘Species delimitation is fundamental to conservation and sustainable use of economically importantforest tree species.However,the delimitation of two highly valued gold-thread nanmu species(Phoebe bournei(Hemsl.)Yang and P.zhennan S.K.Lee&F.N.Wei)has been confusing and debated.To address this problem,we integrated morphology and restriction site-associated DNA sequencing(RAD-seq)to define their species boundaries.We obtained consistent results from the two datasets,supporting two distinct lineages corresponding to P.bournei and P.zhennan.In P.bournei,higher order leaf venation is more prominent,petioles are thicker,and leaf apex angle is narrower,compared to P.zhennan.Both datasets also revealed that the former putative P.bournei populations from northeastern Guizhou belong to P.zhennan.The two species are now distinct in distributions except in the Wuling Mountains,where they overlap.Phoebe bournei occurs mainly in central Fujian,southern Jiangxi,the Nanling Mountains,and the Wuling Mountains,whereas P.zhennan is found in the adjoining eastern regions of the Qionglai Mountains,the southern Sichuan hills,and the Wuling Mountains.The re-delimitation of P.bournei and P.zhennan and clarification of their ranges provide a better scientific basis guiding the conservation and sustainable utilization of these tree species. | Xin Ding Jian Hua Xiao Lang Li John G.Conran Jie Li | 2019 | Journal of Systematics and Evolution2019，57，3： | 6 |
| 2 | Taxonomic status and distribution of Mirabilis himalaica (Nyctaginaceae)显示文摘Mirabilis himalaica (Edgew.) Heimerl (Nyctaginaceae) is endemic to the Himalayas where it is used in traditional Tibetan folk medicine and is the only Old World representative of a large New World genus. The systematic position of M. himalaica and historical biogeography of Mirabilis and related genera was evaluated using two loci (nuclear ribosomal internal transcribed spacer, rps16), with divergence times estimated using internal transcribed spacer sequences. All 16 sampled provenances of M. himalaica formed a strongly supported terminal clade and at the sectional level formed a clade with sect. Quamoclidion sensu stricto, despite their morphology. Section Oxybaphoides and sect. Oxybaphus were not closely related to M. himalaica, suggesting their apparent morphological similarities are convergent. The beast analysis and ancestral area reconstruction indicated that M. himalaica separated from related North American species during the late Miocene to early Pleistocene -5.22 Ma (95% highest posterior density, 2.53–8.18). Both migration by way of the Quaternary Bering land bridge (Beringia) and long-distance dispersal could have contributed to the present-day disjunction between M. himalaica and the American species. These results agree with previous studies that suggest Oxybaphus should be merged into Mirabilis. However, although the infrageneric position of M. himalaica is still uncertain, it is not close to sect. Oxybaphus as has been suggested previously. | Shu-Li Wang Lang Li Xiu-Qin Ci John G.Conran Jie Li | 2019 | Journal of Systematics and Evolution2019，57，5： | 2 |
| 3 | Comparative phylogenetic analyses of Chinese Horsfieldia(Myristicaceae)using complete chloroplast genome sequences显示文摘The biologist's ruler for biodiversity is the species;accurate species identification is fundamental to the conservation of endangered species and in-depth biological scientific exploration.However,the delimitation and affinities of Horsfieldia in China has been controversial,owing in part to very low levels of molecular divergence within the family Myristicaceae.Because species boundaries and phylogenetic relationships within Horsfieldia are also unclear,13 samples were collected across its distribution in China and their genomes were subjected to shotgun sequencing using Illumina platforms.A total of 40487994–84801416 pair-end clean reads were obtained and,after assembly,the complete chloroplast genome was recovered for all samples.Annotation analysis revealed a total of 112 genes,including 78 protein-coding genes,30 transfer RNA,and 4 ribosomal RNA genes.Six variable loci(petN-psbM,trnH-psbA,ndhC-trnV,psbJ-psbL,ndhF,and rrn5-rrn23)were identified.Phylogenetic analyses strongly support the presence of four distinct species of Horsfieldia in China.In addition,samples that had been identified previously as Horsfieldia kingii(Hook.f.)Warb.were indistinguishable from those of H.prainii(King)Warb.,suggesting that if H.kingii does occur in China,it was not collected in this study.Similarly,the chloroplast genome of one H.hainanensis Merr.sample from Guangxi province was identical to H.tetratepala C.Y.Wu,suggesting that the distribution range of H.hainanensis might be narrower than assumed previously.The phylogenetic relationships between the Chinese Horsfieldia species based on the whole chloroplast genomes was supported strongly,indicating the potential for using entire chloroplast genomes as super-barcodes for further resolution of the phylogeny of the genus Horsfieldia. | Chao-Nan Cai Hui Ma Xiu-Qin Ci John G.Conran Jie Li | 2021 | Journal of Systematics and Evolution2021，59，3： | 0 |
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