首页|Phylotranscriptomics reveals extensive gene duplication in the subtribe Gentianinae (Gentianaceae)

Phylotranscriptomics reveals extensive gene duplication in the subtribe Gentianinae (Gentianaceae)

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Gene duplication plays an important role in plants for diversification and adaptation to new habitats.In this study,we aim to reconstruct the genome-scale phylogeny and identify large-scale gene duplication events for the subtribe Gentianinae (Gentianaceae),which is a great symbol of the alpine plants in the Qinghai-Tibet Plateau.We sequenced and assembled 70 transcriptomes from 67 species,representing all six recognized genera in the subtribe Gentianinae plus the closely related outgroups.Using phylogenomic approaches,the backbone relationships of Gentianinae were almost fully resolved with high bootstrap support.Although instances of conflicts were observed between nuclear and plastid phylogenies,six major clades of Gentianinae were consistently recovered in both phylogenies.In addition,we revealed a high occurrence of duplicated genes in our transcriptome assemblies.Using several gene tree reconciliation methods,we collectively identified 1O nodes in the species tree with large concentrations of duplicated genes.Further analysis indicated that many of these duplicated genes likely arose from hybrid polyploidy,which might also account for some of the topological incongruences between nuclear and plastid phylogenies in Gentianinae.

gene duplicationGentianinaehybridizationphylogenytranscriptome

Chun-Lin Chen、Lei Zhang、Jia-Liang Li、Xing-Xing Mao、Lu-Shui Zhang、Quan-Jun Hu、Jian-Quan Liu、Zhen-Xiang Xi

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Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education and State Key Laboratory of Hydraulics and Mountain River Engineering,College of Life Sciences,Sichuan University,Chengdu 610065,China

State Key Laboratory of Grassland Agro-Ecosystems,College of Life Sciences,Lanzhou University,Lanzhou 730000,China

This work was supported by grants from the National Key Research and Development programNa-tional Natural Science Foundation of ChinaNa-tional Natural Science Foundation of ChinaNa-tional Natural Science Foundation of ChinaNa-tional Natural Science Foundation of Chinaand Fundamental Research Funds for the Central Universitiesand Fundamental Research Funds for the Central Universities

2017YFC050520331 59082131600172317003232018CDDY-S02-SCUSCU2019D013

2021

10.1111/jse.12651

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

CSTPCDCSCDSCI
影响因子：0.322
ISSN：1674-4918
年,卷(期)：2021.59(6)
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