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High genetic diversity and differentiation of an extremely narrowly distributed and critically endangered decaploid rose (Rosa praelucens): implications for its conservation

文献类型： 外文期刊

作者： Jian, Hongying 1 ; Li, Shufa 1 ; Guo, Jianling 2 ; Li, Shubin 1 ; Wang, Qigang 1 ; Yan, Huijun 1 ; Qiu, Xianqin 1 ; Zhang 1 ;

作者机构： 1.Yunnan Acad Agr Sci, Natl Engn Res Ctr Ornamental Hort, Flower Res Inst, Kunming 650205, Yunnan, Peoples R China

2.Yunnan Normal Univ, Dept Life Sci, Kunming 650500, Yunnan, Peoples R China

3.Chinese Acad Sci, Key Lab Trop Plant Resources & Sustainable Use, Xishuang

关键词： Genetic differentiation; Genetic diversity; Morphological variation; Rosa praelucens; Conservation strategy

期刊名称：CONSERVATION GENETICS （ 影响因子：2.538； 五年影响因子：2.32 ）

ISSN： 1566-0621

年卷期： 2018 年 19 卷 4 期

页码：

收录情况： SCI

摘要： Rosa praelucens is a critically endangered decaploid alpine rose with an extremely narrow geographic distribution in Northwestern Yunnan, China. We sampled almost all the extant individuals (527 individuals in 31 natural locations and 56 individuals preserved in three local living collections) to assess the genetic variation and to probe the genetic connectivity among the individuals and populations based on three cpDNA intergenic spacers and six fluorescent amplified fragment length polymorphism (AFLP) markers. The morphological traits from seven populations were also measured. R. praelucens exhibited high levels of morphological variation, genetic diversity, and differentiation. The extant individuals were clustered into eight groups in neighbor-net networks, and subsequent Bayesian analysis assigned them into three larger gene pools, both in accordance with their morphological traits, especially flower color. The living collections embraced two private cpDNA haplotypes and included three out of the species' total eight AFLP genotypes. Rhizome clonal growth, decaploid, and mixed breeding system may largely contribute to high genetic diversity and differentiation in R. praelucens. We concluded that the endangered status of R. praelucens may mainly be due to habitat fragmentation and loss and inherent reproductive difficulties, rather than low genetic diversity. The populations contributing higher cpDNA genetic diversity, representing more AFLP genotypes, and encompassing private cpDNA haplotypes should be given conservation priority by creating plant-micro reserves. The living collections should also be targeted for further ex situ conservation, population recovery, and reintroduction of R. praelucens plants.

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