Natural population structure and genetic differentiation for heterodicogamous plant: Cyclocarya paliurus (Batal.) Iljinskaja (Juglandaceae)

作者：Li, Xiaochun; Fu, Xiangxiang^*; Shang, Xulan; Yang, Wanxia; Fang, Shengzuo

来源：Tree Genetics & Genomes, 2017, 13(4): 80.

DOI：10.1007/s11295-017-1157-5

• Cyclocarya paliurus
• Molecular markers
• Population structure
• Population success
• Genetic diversity
• Population differentiation

Cyclocarya paliurus, a Chinese monotypic genus belonging to the Juglandaceae, exhibits a widespread distribution in southern China. To provide resource support for its future breeding and medicinal utilization, much information involving natural population succession and genetic diversity of C. paliurus should be obtained. In this study, the structures of 30 natural populations throughout its distribution were analyzed based on the investigation, showing the ratio of individuals with DBH < 40 cm accounting for 71.7%. Inter-simple sequence repeat (ISSR) and simple sequence repeat (SSR) were used for evaluation of 244 individuals from 29 natural populations. High-level polymorphism (100%) indicates high efficiency of two markers. Analysis demonstrated that genetic diversity (value of 0.18 for ISSR and 0.09 for SSR) was low among populations. While gene flow among populations reached 1.182 and 1.335 for ISSR and SSR, respectively, indicating genetic variations mainly existing within population. Twenty-six populations (size >= 5 individuals) were grouped into five clusters based on the combined ISSR and SSR loci. The value of Nei's coefficient varying from 0.87 to 0.96 indicates small differentiation among groups. Furthermore, we speculate that C. paliurus is an expanding species in subtropical China (most of populations are increasing type (IP)) and discuss the strategy of germplasm conservation.

• 出版日期2017-8
• 单位南京林业大学