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

Abstract:

BACKGROUND:Previous 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. RESULTS:We 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. CONCLUSIONS:These 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.

journal_name

BMC Genomics

journal_title

BMC genomics

authors

Butler JB,Vaillancourt RE,Potts BM,Lee DJ,King GJ,Baten A,Shepherd M,Freeman JS

doi

10.1186/s12864-017-3782-7

subject

Has Abstract

pub_date

2017-05-22 00:00:00

pages

397

issue

1

issn

1471-2164

pii

10.1186/s12864-017-3782-7

journal_volume

18

pub_type

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