Population genetic structure and connectivity of a riparian selfing herb Caulokaempferia coenobialis at a fine-scale geographic level in subtropical monsoon forest
Abstract Background Rivers and streams facilitate movement of individuals and their genes across the landscape and are generally recognized as dispersal corridors for riparian plants. Nevertheless, some authors have reported directly contrasting results, which may be attributed to a complex mixture...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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BMC
2021-07-01
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| Series: | BMC Plant Biology |
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| Online Access: | https://doi.org/10.1186/s12870-021-03101-7 |
| _version_ | 1818577433661538304 |
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| author | Qiong Fu Jie Deng Min Chen Yan Zhong Guo-Hui Lu Ying-Qiang Wang |
| author_facet | Qiong Fu Jie Deng Min Chen Yan Zhong Guo-Hui Lu Ying-Qiang Wang |
| author_sort | Qiong Fu |
| collection | DOAJ |
| description | Abstract Background Rivers and streams facilitate movement of individuals and their genes across the landscape and are generally recognized as dispersal corridors for riparian plants. Nevertheless, some authors have reported directly contrasting results, which may be attributed to a complex mixture of factors, such as the mating system and dispersal mechanisms of propagules (seed and pollen), that make it difficult to predict the genetic diversity and population structure of riparian species. Here, we investigated a riparian self-fertilizing herb Caulokaempferia coenobialis, which does not use anemochory or zoochory for seed dispersal; such studies could contribute to an improved understanding of the effect of rivers or streams on population genetic diversity and structure in riparian plants. Using polymorphic ISSR and cpDNA loci, we studied the effect at a microgeographic scale of different stream systems (a linear stream, a dendritic stream, and complex transverse hydrological system) in subtropical monsoon forest on the genetic structure and connectivity of C. coenobialis populations across Dinghu Mountain (DH) and Nankun Mountain (NK). Results The results indicate that the most recent haplotypes (DH: H7, H8; NK: h6, h7, h11, h12) are not shared among local populations of C. coenobialis within each stream system. Furthermore, downstream local populations do not accumulate genetic diversity, whether in the linear streamside local populations across DH (H: 0.091 vs 0.136) or the dendritic streamside local populations across NK (H: 0.079 vs 0.112, 0.110). Our results show that the connectivity of local C. coenobialis populations across DH and NK can be attributed to historical gene flows, resulting in a lack of spatial genetic structure, despite self-fertilization. Selfing C. coenobialis can maintain high genetic diversity (H = 0.251; I = 0.382) through genetic differentiation (G ST = 0.5915; F ST = 0.663), which is intensified by local adaptation and neutral mutation and/or genetic drift in local populations at a microgeographic scale. Conclusion We suggest that streams are not acting as corridors for dispersal of C. coenobialis, and conservation strategies for maintaining genetic diversity of selfing species should be focused on the protection of all habitat types, especially isolated fragments in ecosystem processes. |
| first_indexed | 2024-12-16T06:29:50Z |
| format | Article |
| id | doaj.art-9934650594db4bf9a575b70fad58eb76 |
| institution | Directory Open Access Journal |
| issn | 1471-2229 |
| language | English |
| last_indexed | 2024-12-16T06:29:50Z |
| publishDate | 2021-07-01 |
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| series | BMC Plant Biology |
| spelling | doaj.art-9934650594db4bf9a575b70fad58eb762022-12-21T22:40:55ZengBMCBMC Plant Biology1471-22292021-07-0121111710.1186/s12870-021-03101-7Population genetic structure and connectivity of a riparian selfing herb Caulokaempferia coenobialis at a fine-scale geographic level in subtropical monsoon forestQiong Fu0Jie Deng1Min Chen2Yan Zhong3Guo-Hui Lu4Ying-Qiang Wang5Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, School of Life Sciences, South China Normal UniversityGuangdong Provincial Key Laboratory of Biotechnology for Plant Development, School of Life Sciences, South China Normal UniversityGuangdong Provincial Key Laboratory of Biotechnology for Plant Development, School of Life Sciences, South China Normal UniversityGuangdong Provincial Key Laboratory of Biotechnology for Plant Development, School of Life Sciences, South China Normal UniversityGuangdong Provincial Key Laboratory of Biotechnology for Plant Development, School of Life Sciences, South China Normal UniversityGuangdong Provincial Key Laboratory of Biotechnology for Plant Development, School of Life Sciences, South China Normal UniversityAbstract Background Rivers and streams facilitate movement of individuals and their genes across the landscape and are generally recognized as dispersal corridors for riparian plants. Nevertheless, some authors have reported directly contrasting results, which may be attributed to a complex mixture of factors, such as the mating system and dispersal mechanisms of propagules (seed and pollen), that make it difficult to predict the genetic diversity and population structure of riparian species. Here, we investigated a riparian self-fertilizing herb Caulokaempferia coenobialis, which does not use anemochory or zoochory for seed dispersal; such studies could contribute to an improved understanding of the effect of rivers or streams on population genetic diversity and structure in riparian plants. Using polymorphic ISSR and cpDNA loci, we studied the effect at a microgeographic scale of different stream systems (a linear stream, a dendritic stream, and complex transverse hydrological system) in subtropical monsoon forest on the genetic structure and connectivity of C. coenobialis populations across Dinghu Mountain (DH) and Nankun Mountain (NK). Results The results indicate that the most recent haplotypes (DH: H7, H8; NK: h6, h7, h11, h12) are not shared among local populations of C. coenobialis within each stream system. Furthermore, downstream local populations do not accumulate genetic diversity, whether in the linear streamside local populations across DH (H: 0.091 vs 0.136) or the dendritic streamside local populations across NK (H: 0.079 vs 0.112, 0.110). Our results show that the connectivity of local C. coenobialis populations across DH and NK can be attributed to historical gene flows, resulting in a lack of spatial genetic structure, despite self-fertilization. Selfing C. coenobialis can maintain high genetic diversity (H = 0.251; I = 0.382) through genetic differentiation (G ST = 0.5915; F ST = 0.663), which is intensified by local adaptation and neutral mutation and/or genetic drift in local populations at a microgeographic scale. Conclusion We suggest that streams are not acting as corridors for dispersal of C. coenobialis, and conservation strategies for maintaining genetic diversity of selfing species should be focused on the protection of all habitat types, especially isolated fragments in ecosystem processes.https://doi.org/10.1186/s12870-021-03101-7Genetic variationMating systemFine-scale spatial genetic structureGene flowSeed dispersal |
| spellingShingle | Qiong Fu Jie Deng Min Chen Yan Zhong Guo-Hui Lu Ying-Qiang Wang Population genetic structure and connectivity of a riparian selfing herb Caulokaempferia coenobialis at a fine-scale geographic level in subtropical monsoon forest BMC Plant Biology Genetic variation Mating system Fine-scale spatial genetic structure Gene flow Seed dispersal |
| title | Population genetic structure and connectivity of a riparian selfing herb Caulokaempferia coenobialis at a fine-scale geographic level in subtropical monsoon forest |
| title_full | Population genetic structure and connectivity of a riparian selfing herb Caulokaempferia coenobialis at a fine-scale geographic level in subtropical monsoon forest |
| title_fullStr | Population genetic structure and connectivity of a riparian selfing herb Caulokaempferia coenobialis at a fine-scale geographic level in subtropical monsoon forest |
| title_full_unstemmed | Population genetic structure and connectivity of a riparian selfing herb Caulokaempferia coenobialis at a fine-scale geographic level in subtropical monsoon forest |
| title_short | Population genetic structure and connectivity of a riparian selfing herb Caulokaempferia coenobialis at a fine-scale geographic level in subtropical monsoon forest |
| title_sort | population genetic structure and connectivity of a riparian selfing herb caulokaempferia coenobialis at a fine scale geographic level in subtropical monsoon forest |
| topic | Genetic variation Mating system Fine-scale spatial genetic structure Gene flow Seed dispersal |
| url | https://doi.org/10.1186/s12870-021-03101-7 |
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