Phylogenomic insights into the reticulate evolution of Camellia sect.Paracamellia Sealy(Theaceae)

Sheng-Yuan Qin ¹Kai Chen ²Wen-Ju Zhang ³Xiao-Guo Xiang ²Zheng-Yu Zuo ⁴Cen Guo ⁵Yao Zhao ²Lin-Feng Li ³Yu-Guo Wang ³Zhi-Ping Song ³Ji Yang ³Xiao-Qiang Yang ²Jian Zhang ²Wei-Tao Jin ²Qiang Wen ⁶Song-Zi Zhao ⁶Jia-Kuan Chen ⁷De-Zhu Li ⁵Jun Rong²

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作者信息

1. Jiangxi Province Key Laboratory of Watershed Ecosystem Change and Biodiversity,Center for Watershed Ecology,Institute of Life Science and School of Life Sciences,Nanchang University,Nanchang 330031,China;Germplasm Bank of Wild Species,Kunming Institute of Botany,Chinese Academy of Sciences,Kunming 650201,China;Kunming College of Life Science,University of Chinese Academy of Sciences,Kunming 650201,China
2. Jiangxi Province Key Laboratory of Watershed Ecosystem Change and Biodiversity,Center for Watershed Ecology,Institute of Life Science and School of Life Sciences,Nanchang University,Nanchang 330031,China
3. Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering,Institute of Biodiversity Science,Fudan University,Shanghai 200438,China
4. Germplasm Bank of Wild Species,Kunming Institute of Botany,Chinese Academy of Sciences,Kunming 650201,China;Kunming College of Life Science,University of Chinese Academy of Sciences,Kunming 650201,China
5. Germplasm Bank of Wild Species,Kunming Institute of Botany,Chinese Academy of Sciences,Kunming 650201,China
6. Jiangxi Provincial Key Laboratory of Camellia Germplasm Conservation and Utilization,Jiangxi Academy of Forestry,Nanchang 330013,China
7. Jiangxi Province Key Laboratory of Watershed Ecosystem Change and Biodiversity,Center for Watershed Ecology,Institute of Life Science and School of Life Sciences,Nanchang University,Nanchang 330031,China;Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering,Institute of Biodiversity Science,Fudan University,Shanghai 200438,China
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Abstract

Polyploids are common in Camellia sect.Paracamellia,which contain many important oil crop species.However,their complex evolutionary history is largely unclear.In this study,22 transcriptomes and 19 plastomes of related species of Camellia were sequenced and assembled,providing the most completed taxa sampling of Camellia sect.Oleifera and C.sect.Paracamellia.Phylogenetic trees were reconstructed with predicted single-copy nuclear genes and plastomes.Phylogenetic trees with nuclear genes demonstrated that C.sect.Oleifera should be merged into C.sect.Paracamellia.Cytonuclear discordance and network analyses suggested hybridizations among polyploid species and relatives.The divergence of major clades in C.sect.Paracamellia was dated to be during the middle to late Miocene from the ancestral Lingnan region,and a rapid diversification during the Quaternary was found,probably through hybridization and polyploidization.The tetraploid Camellia meiocarpa Hu may have originated from hybridization between closely related diploid species.The hexaploid Camellia oleifera C.Abel probably originated from hybridization between closely related diploid and tetraploid(e.g.,C.meiocarpa)species.The octoploid Camellia vietnamensis T.C.Huang ex Hu could have originated from hybridization between hexaploid C.oleifera and the closely related diploid species.Hybridization and polyploidization played an important role in generating the rich variation of important fruit traits,especially increased fruit size in polyploid species.

Key words

Camellia oleifera/hybridization/phylogenomics/plastome/polyploidization/transcriptome

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基金项目

National Natural Science Foundation of China(31870311)

the"Gan-Po Talent 555"Project of Jiangxi Province()

Natural Science Foundation of Jiangxi Province,China(20212BAB205019)

出版年

2024

植物分类学报

中国科学院植物研究所　中国植物学会

植物分类学报

CSTPCD

影响因子：0.322

ISSN：1674-4918

参考文献量70

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