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Genetic structure and demographic analysis of a true single-population species, Camellia azalea

文献类型： 外文期刊

作者： Wang, Ruo-Qiu 1 ; Xu, Ying 2 ; Zhang, Min 3 ; Hao, Gang 4 ; Zhao, Qiang-Min 5 ; Liu, Xin-Kai 5 ; Liu, Xiao-Fei 6 ; Yu, Bo 6 ; Zhang, Wen-Ju 2 ;

作者机构： 1.Shenzhen Polytech Univ, Tech X Inst, Tech X Acad, Shenzhen 518055, Guangdong, Peoples R China

2.Fudan Univ, Sch Life Sci, Key Lab Biodivers Sci & Ecol Engn, Minist Educ, Shanghai 200438, Peoples R China

3.Nanjing Forestry Univ, Coll Life Sci, Coinnovat Ctr Sustainable Forestry Southern China, Nanjing 210037, Jiangsu, Peoples R China

4.South China Agr Univ, Coll Life Sci, Guangzhou 510642, Guangdong, Peoples R China

5.Palm Ecotown Dev Co Ltd, Guangzhou 510627, Guangdong, Peoples R China

6.Guangdong Acad Agr Sci, Environm Hort Res Inst, Guangdong Key Lab Ornamental Plant Germplasm Innov, Guangzhou 510640, Peoples R China

关键词： Genetic diversity; Fine-scale genetic structure; Habitat degradation; Conservation; SSR

期刊名称：BMC PLANT BIOLOGY （ 影响因子：4.8； 五年影响因子：5.4 ）

ISSN： 1471-2229

年卷期： 2024 年 24 卷 1 期

页码：

收录情况： SCI

摘要： Single-population species (SPS) consist of only one natural population and often are at high risk of extinction. Although almost all species must go through this special stage in their evolutionary process, there is little understanding of how SPS survives. Camellia azalea C. F. Wei is a typical SPS, and has precious breeding values for its special flowering period. This study surveyed the age structure and spatial distribution of C. azalea, analyzed its genetic diversity and fine-scale spatial genetic structure (SGS) using microsatellite markers for 629 individuals, and estimated the effect of human disturbances on its population dynamics. Results showed that this species had a relatively moderate genetic diversity (I = 0.989, He = 0.509, and Ho = 0.497), high rate of sapling (similar to 35%), and a narrow habitat (similar to 6 km long, similar to 10 m wide). Although the construction of dams and roads did not lead to a significant loss of genetic diversity and genetic differentiation (F-ST = 0.0096 similar to 0.0128, N-m = 19 similar to 26), it limited C. azalea's seed flow (adults, 95 m; juveniles, 60 m), which was a reason for juveniles having a stronger SGS than adults. These results indicate that as an SPS, C. azalea still possesses the potential capacity for self-evolution and regeneration, however, it is at risk of extinction due to its small range, narrow habitat, and human distances. Furthermore, the results are also of enlightening significance to the conservation of other SPS, especially those distributed along the riparian zone.

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