Species Redress In The Calligonum mongolicum Complex (Polygonaceae) -A Multidisciplinary Approach
Wei Shi1,2,*, Yanfen Zhao3, Fankui Kong4, Borong Pan1,2
1Institute of Ecology and Geography in Xinjiang, Chinese Academy of Sciences, Urumqi-830011, China
2Turpan Eremophytes Botanic Garden, Chinese Academy of Sciences, Turpan-838008, China
3Xinjiang Agricultural University, Urumqi-830052, China
4Graduate School of the Chinese Academy of Sciences, Beijing-100014, China
*Corresponding author Email: firstname.lastname@example.org
Present study is focused on taxonomic characters and genetic variation in Calligonum mongolicum Turcz. (Polygonaceae) complex which includes C. alashanicum A. Los., C. chinense A. Los., C. gobicum A. Los., C. pumilum A. Los., and C. zaidamense A. Los. Relationships within and in between populations of C. mongolicum and six related species (C. alashanicum, C. chinense, C. gobicum, C. pumilum, and C. zaidamens) was examined on the basis of their phenotypes like flower, life-form, branches, and fruit morphological characters; karyotypes and microsatellite markers which can improve conservation of this plants and its germplasm resource. The phenotypes of parents and offspring were compared and all the indices had no taxonomic value in this complex. Calligonum mongolicum includes diploid (2n = 18) and triploid (2n = 27) individuals. All the species have similar karyotypes (2B or 2C) which suggest that C. pumilum, C. gobicum, C. chinense and C. zaidamense are probably derived from C. mongolicum. Only 4/14 of the polymorphic microsatellite loci that have been isolated and characterized in C. mongolicum were successfully amplified in C. mongolicum, C. pumilum, C. gobicum, C. chinense, and C. zaidamense. Based on comparison of the phenotypes, karyotypes, and microsatellite markers, it has been suggested that C. pumilum, C. gobicum, C. chinense, and C. zaidamense should be merged within C. mongolicum. Investigations on the offspring and karyotypes of C. alashanicum alongwith ITS sequencing shall be continued further.