Genetic variability and structure of an important wild steppe grass Psathyrostachys juncea (Triticeae: Poaceae) germplasm collection from north and central Asia

PeerJ

article

Yi Xiong¹  Yanli Xiong¹  Qingqing Yu¹  Junming Zhao¹  Xiong Lei¹  Zhixiao Dong¹  Jian Yang¹  Sijia Song¹  Yan Peng¹  Wenhui Liu²  Shiqie Bai³  Xiao Ma¹ 

[1] College of Animal Science and Technology, Sichuan Agricultural University;Key Laboratory of Superior Forage Germplasm in the Qinghai-Tibet Plateau, Qinghai Academy of Animal Science and Veterinary Medicine;Sichuan Academy of Grassland Sciences

关键词: Psathyrostachys juncea;    AFLPs;    Population configuration;    Genetic diversity;    Local adaptation;   

DOI  :  10.7717/peerj.9033

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

Russian wildrye, Psathyrostachys junceus (Fisch.) Nevski, is an important wild steppe perennial grass, which is characterized by longevity and short robust rhizomes. It also has highly resistance in grazing and abiotic stress. In this study, the genetic diversity of eleven P. juncea wild germplasms from north and central Asia was investigated using AFLP markers. The P. juncea populations were divided into three clades in both UPGMA dendrogram and PCoA clustering corresponding to the three genetic memberships in STRUCTURE analysis. The genetic specificity of Xinjiang (XJ) populations was revealed by the highest Ne (1.5411) and Hj (0.3553) and their dispersion shown in UPGMA. High inbreeding coefficient (Wright’s F statistics, f = 0.496, Fst = 0.128) was observed although a moderate degree of gene flow (Nm = 1.4736) existed, that may ascribe to habitat fragmentation or the low seedling recruitment, which ultimately resulted in decrease of population size and their genetic diversity. The key factors inducing moderate genetic differentiation detected in this study were isolation by distance (IBD), climatic variabilities and geographical barriers. All these results provide insights into the study of genetic status and germplasm collecting of Russian wildrye.

【 授权许可】

CC BY