High cryptic species diversity is revealed by genome-wide polymorphisms in a wild relative of banana, Musa itinerans, and implications for its conservation in subtropical China

doi:10.1186/s12870-018-1410-6

	High cryptic species diversity is revealed by genome-wide polymorphisms in a wild relative of banana, Musa itinerans, and implications for its conservation in subtropical China
	Wu, Wei 1; Ng, Wei-Lun 1; Yang, Jun-Xin 2; Li, Wei-Ming 3; Ge, Xue-Jun 4
刊名	BMC PLANT BIOLOGY
	2018-09-14
卷号	18 页码:11
关键词	Crop wild relatives (CWRs) Genome resequencing Musa Species delimitation
ISSN号	1471-2229
DOI	10.1186/s12870-018-1410-6
通讯作者	Ge, Xue-Jun(xjge@scbg.ac.cn)
英文摘要	Background: Species delimitation is a challenging but essential task in conservation biology. Morphologically similar species are sometimes difficult to recognize even after examination by experienced taxonomists. With the advent of molecular approaches in species delimitation, this hidden diversity has received much recent attention. In addition to DNA barcoding approaches, analytical tools based on the multi-species coalescence model (MSC) have been developed for species delimitation. Musa itinerans is widely distributed in subtropical Asia, and at least six varieties have been documented. However, the number of evolutionarily distinct lineages remains unknown. Results: Using genome resequencing data of five populations (making up four varieties), we examined genome-wide variation and found four varieties that were evolutionary significant units. A Bayesian Phylogenetics and Phylogeography (BP&P) analysis using 123 single copy nuclear genes support three speciation events of M. itinerans varieties with robust posterior speciation probabilities; However, a Bayes factor delimitation of species with genomic data (BFD) analysis using 1201 unlinked single nucleotide polymorphisms gave decisive support for a five-lineage model. When reconciling divergence time estimates with a speciation time scale, a modified three-lineage model was consistent with that of BP&P, in which the speciation time of two varieties (M. itinerans var. itinerans and M. itinerans var. lechangensis) were dated to 26.2 kya and 10.7 kya, respectively. In contrast, other two varieties (M. itinerans var. chinensis and M. itinerans var. guangdongensis) diverged only 3.8 kya in the Anthropocene; this may be a consequence of genetic drift rather than a speciation event. Conclusion: Our results showed that the M. itinerans species complex harbours high cryptic species diversity. We recommend that M. itinerans var. itinerans and M. itinerans var. lechangensis be elevated to subspecies status, and the extremely rare latter subspecies be given priority for conservation. We also recommend that the very recently diverged M. itinerans var. chinensis and M. itinerans var. guangdongensis should be merged under the subspecies M. itinerans var. chinensis. Finally, we speculate that species delimitation of recently diverged lineages may be more effective using genome-wide bi-allelic SNP markers with BFD than by using unlinked loci and BP&P.
资助项目	National Natural Science Foundation of China[31261140366]
WOS关键词	DNA-SEQUENCING DATA ; GENE FLOW ; SNP DATA ; DELIMITATION ; ASSOCIATION ; DIVERGENCE ; SPECIATION ; FRAMEWORK ; INFERENCE ; VARIETY
WOS研究方向	Plant Sciences
语种	英语
出版者	BMC
WOS记录号	WOS:000444911500002
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/52919]
专题	中国科学院地理科学与资源研究所
通讯作者	Ge, Xue-Jun
作者单位	1.Sun Yat Sen Univ, State Key Lab Biocontrol, Guangzhou 510275, Guangdong, Peoples R China 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Ctr Environm Remediat, Beijing 100101, Peoples R China 3.Chinese Acad Trop Agr Sci, South Subtrop Crops Res Inst, Key Lab Trop Fruit Biol, Minist Agr, Zhanjiang 524091, Peoples R China 4.Chinese Acad Sci, Key Lab Plant Resources Conservat & Sustainable U, South China Bot Garden, Guangzhou 510650, Guangdong, Peoples R China
推荐引用方式 GB/T 7714	Wu, Wei,Ng, Wei-Lun,Yang, Jun-Xin,et al. High cryptic species diversity is revealed by genome-wide polymorphisms in a wild relative of banana, Musa itinerans, and implications for its conservation in subtropical China[J]. BMC PLANT BIOLOGY,2018,18:11.
APA	Wu, Wei,Ng, Wei-Lun,Yang, Jun-Xin,Li, Wei-Ming,&Ge, Xue-Jun.(2018).High cryptic species diversity is revealed by genome-wide polymorphisms in a wild relative of banana, Musa itinerans, and implications for its conservation in subtropical China.BMC PLANT BIOLOGY,18,11.
MLA	Wu, Wei,et al."High cryptic species diversity is revealed by genome-wide polymorphisms in a wild relative of banana, Musa itinerans, and implications for its conservation in subtropical China".BMC PLANT BIOLOGY 18(2018):11.