Genetic Diversity and Population Structure of Rhododendron longipedicellatum, an Endangered Species

文献类型： 外文期刊

第一作者： Cao, Yurong

作者： Cao, Yurong;Li, Zhenghong;Liu, Xiongfang;Ma, Hong;Ma, Yongpeng;Liu, Detuan;Qu, Suping;Ma, Hong

作者机构：

关键词： conservation genetics; molecular markers; EST-SSR; endangered species; bottleneck effect

期刊名称：TROPICAL CONSERVATION SCIENCE （ 影响因子：1.721； 五年影响因子：2.238 ）

ISSN： 1940-0829

年卷期： 2022 年 15 卷

页码：

收录情况： SCI

摘要： Rhododendron longipedicellatum is an endangered species endemic to southeastern Yunnan, China. Assessment of genetic variation is critical for protecting endangered species. Therefore, we used EST-SSR markers to analyze the genetic characteristics of R. longipedicellatum. The results revealed high genetic diversity at the species level (He = 0.559, N-A = 9.529) and within populations (He = 0.507, N-A = 5.910) and moderate genetic differentiation between populations (F-ST = 0.083). In addition, more genetic variation existed within populations (91.25%) compared with variation among populations (8.75%). The STRUCTURE analysis showed that 150 individuals from five existing populations could best be divided into two genetic groups. At the population level, the neighbor-joining (NJ) tree and principal coordinates analysis (PCoA) analyses also divided them into two groups. In addition, Bottleneck analyses using the Two-Phase Model (TPM) and Stepwise Mutation Model (SMM) as well as the Garza-Williamson Index revealed widespread signatures of bottleneck events. These results provide vital information for scientifically formulating conservation strategies for the endangered R. longipedicellatum.

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