Abstract
AbstractThe status of genomics and genetics research in the Myrtaceae, a large family of dicotyledonous woody plants, is reviewed withEucalyptusas the focal genus. The family contains over 5,650 species in 130 to 150 genera, predominantly of neo-tropical and Southern Hemisphere distribution. Several genera are well known for their economic importance worldwide. Myrtaceae are typically diploids with small to intermediate genome size. Microsatellites have been developed for several genera while higher throughput marker systems such as diversity arrays technology and single nucleotide polymorphism are available forEucalyptus. Molecular data have been fundamental to current perspectives on the phylogeny, phylogeography and taxonomy of the Myrtaceae, while numerous studies of genetic diversity have been carried out particularly as it relates to endangered, rare, fragmented, overharvested or economically important species. Large expressed sequence tag collections for species ofEucalyptushave recently become public to support the annotation of theEucalyptus grandisgenome. Transcriptomics inEucalyptushas advanced by microarrays and next-generation sequencing focusing on wood development. Linkage maps forEucalyptusdisplay high synteny across species and have been extensively used to map quantitative trait loci for a number of traits including growth, wood quality, disease and insect resistance. Candidate gene-based association genetics have successfully found marker–trait associations for wood and fiber traits. Genomic selection experiments have demonstrated clear potential to improve the efficiency of breeding programs while freeze-tolerant transgenicEucalyptustrials have recently been initiated. The recently releasedE. grandisgenome, sequenced to an average coverage of 8×, will open up exceptional opportunities to advance Myrtaceae genetics and genomics research.
Highlights
The Myrtaceae (Myrtle, eucalypts, clove, or guava family) is a large family of dicotyledonous woody plants placed within the order Myrtales containing over 5,650 species organized in 130 to 150 genera (Govaerts et al 2008)
We present the current standing of genomics and other related fields in the Myrtaceae
In the tribe Chamelaucieae, analysis of sequence data from the matK gene and the atpβ-rbcL intergenic spacer showed no support for previously recognized sub-alliances based on fruit type; some genera were monophyletic while others were not, such as Babingtonia (Wilson et al 2007), and several clades required recognition as new genera (Lam et al 2002)
Summary
The Myrtaceae (Myrtle, eucalypts, clove, or guava family) is a large family of dicotyledonous woody plants placed within the order Myrtales containing over 5,650 species organized in 130 to 150 genera (Govaerts et al 2008). The first estimates of nuclear DNA content and respective genome sizes for Eucalyptus were reported for Eucalyptus globulus at 1.13 pg/2 C (Marie and Brown 1993) and for a number of additional species by Grattapaglia and Bradshaw (1994).
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