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Banna botanical garden has made new progress in the distribution and evolution of endemic species in Hengduanshan Himalayas

Banna botanical garden has made new progress in the distribution and evolution of endemic species in Hengduanshan Himalayas

Mu Qiyong

Hengduanshan Himalaya region is a famous biodiversity hotspot, which is rich in plant diversity and species endemism. The formation and maintenance of endemic species in this region is a hot issue. Under the guidance of researcher Xing Yaowu, Qi Yong, the postgraduate mother of biogeography and ecology group of Banna botanical garden, took the endemic genus acanthocalyx of honeysuckle family in this area as the research object, and used the means of pedigree geography to explore the distribution and evolution of the genus and its relationship with geological historical events.

Firstly, the taxonomic problems of the genus were clarified, and the type specimens of A. delavayi were redesigned (mu et al. 2020. Phytotaxia, 451:90-92). The results of pedigree geography reveal that Nitraria lanceolata participates in the inconsistent pedigree pattern of Dipsacus lanceolata in Hengduanshan Himalaya region. Among them, the main genetic differentiation of Stichopus japonicus occurred among populations and existed for 30 years in Hengduanshan ?— thirty-one ? The pedigree divided by n-line is geographically discontinuous, while the main genetic differentiation of Dipsacus acutus occurs in the population, which exists in about 96 ? Genetic distribution difference between Hengduan Mountain and East Himalaya bounded by E. All populations of Stichopus japonicus had only one haplotype, and the genetic diversity was the lowest. Phylogenetic and haplotype network analysis showed that Stichopus japonicus might come from the species formation isolated from the peripheral population of Dipsacus japonicus. The results of molecular clock time estimation show that the differentiation time of the main lineages of Stichopus japonicus in the north and south of Hengduanshan is in the late Pliocene (ca.3.54 MA), and the differentiation time of Stichopus japonicus involved in Stichopus japonicus is in the early Pleistocene (ca.2.79 MA), which may be affected by the environmental changes of Late Cenozoic and Quaternary ice age.

The research results were published online in April botany, a classic Journal of Botany, entitled "comparative phylogeography of acanthocalyx (Caprifoliaceae) reviews distinct genetic structures in the Himalaya – Hengduan Mountains". The research was supported by the National Natural Science Foundation of China (u1802242) and the open project of the Key Laboratory of tropical forest ecology.

Morphological characteristics of calyx ginseng. A. D, G: habitat and morphological characteristics of Stichopus japonicus. B. E, H: habitat and morphological characteristics of Dipsacus acutus. C. F, I: habitat and morphological characteristics of Stichopus japonicus.
Genealogical and geographical patterns of Stichopus japonicus in Hengduanshan area. A: Haplotype phylogenetic relationship. B: Haplotype network grouping, i.e. group A, group B and group C. C: Haplotype geographical distribution (black solid line is changed from the North-South boundary of Hengduanshan in Pan Himalayan Division).
Haplotype distribution of Dipsacus acutus in Hengduanshan Himalayan region
Banna botanical garden has made new progress in the distribution and evolution of endemic species in Hengduanshan Himalayas
Author:MuQiyong
  address:Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences. Menglun, Mengla, Yunnan 666303, China   
E-mail:ywxing@xtbg.org.cn
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