Comparative genomics of Eucalyptus and Corymbia reveals low rates of genome structural rearrangement

BMC Genomics

Research Article

D. J. Lee¹  R. E. Vaillancourt²  B. M. Potts²  J. B. Butler³  J. S. Freeman³  G. J. King⁴  A. Baten⁴  M. Shepherd⁴ 

[1] Forest Industries Research Centre, University of the Sunshine Coast, Locked Bag 4, 4558, Maroochydore DC, QLD, Australia;School of Biological Science and ARC Training Centre for Forest Value, University of Tasmania, Private Bag 55, 7001, Hobart, TAS, Australia;School of Biological Science, University of Tasmania, Private Bag 55, 7001, Hobart, TAS, Australia;Southern Cross Plant Science, Southern Cross University, Military Rd, 2480, Lismore, NSW, Australia;

关键词: Chromosome rearrangement;    Corymbia citriodora;    DArTseq;    Eucalyptus grandis;    Genome structure;    Linkage mapping;   

DOI  :  10.1186/s12864-017-3782-7

 received in 2016-08-09, accepted in 2017-05-10,  发布年份 2017

来源: Springer

【 摘 要 】

BackgroundPrevious studies suggest genome structure is largely conserved between Eucalyptus species. However, it is unknown if this conservation extends to more divergent eucalypt taxa. We performed comparative genomics between the eucalypt genera Eucalyptus and Corymbia. Our results will facilitate transfer of genomic information between these important taxa and provide further insights into the rate of structural change in tree genomes.ResultsWe constructed three high density linkage maps for two Corymbia species (Corymbia citriodora subsp. variegata and Corymbia torelliana) which were used to compare genome structure between both species and Eucalyptus grandis. Genome structure was highly conserved between the Corymbia species. However, the comparison of Corymbia and E. grandis suggests large (from 1–13 MB) intra-chromosomal rearrangements have occurred on seven of the 11 chromosomes. Most rearrangements were supported through comparisons of the three independent Corymbia maps to the E. grandis genome sequence, and to other independently constructed Eucalyptus linkage maps.ConclusionsThese are the first large scale chromosomal rearrangements discovered between eucalypts. Nonetheless, in the general context of plants, the genomic structure of the two genera was remarkably conserved; adding to a growing body of evidence that conservation of genome structure is common amongst woody angiosperms.

【 授权许可】

CC BY   
© The Author(s). 2017