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  • 1
    Online Resource
    Online Resource
    Transcriptome analysis of terpene chemotypes of Melaleuca alternifolia across different tissues
    Wiley ; 2017
    In:  Plant, Cell & Environment Vol. 40, No. 10 ( 2017-10), p. 2406-2425
    Details
    In: Plant, Cell & Environment, Wiley, Vol. 40, No. 10 ( 2017-10), p. 2406-2425
    Abstract: In this study we sequenced transcriptomes from three different plant tissues from three cardinal chemotypes of Melaleuca alternifolia in order to discover the molecular basis of terpene chemotype variation. We discovered that two chemotypes differed only by the expression of eleven genes ‐ eight of which were terpene synthases, while the third chemotype had hundreds of differentially expressed genes compared to the other two chemotypes. This chemotype is isolated and we hypothesise that the large differences occur through either isolation or introgression with a closely related species. Through statistical analysis, we were able to associate terpene synthase transcripts with individual terpenes, which was confirmed through three functionally characterised terpene synthase genes.
    Type of Medium: Online Resource
    ISSN: 0140-7791 , 1365-3040
    URL: Issue
    URL: Article
    DOI: 10.1111/pce.v40.10
    DOI: 10.1111/pce.13048
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2017
    detail.hit.zdb_id: 391893-2
    detail.hit.zdb_id: 2020843-1
    SSG: 12
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  • 2
    Online Resource
    Online Resource
    Accuracy of Genomic Prediction for Foliar Terpene Traits in Eucalyptus polybractea
    Oxford University Press (OUP) ; 2018
    In:  G3 Genes|Genomes|Genetics Vol. 8, No. 8 ( 2018-08-01), p. 2573-2583
    Details
    In: G3 Genes|Genomes|Genetics, Oxford University Press (OUP), Vol. 8, No. 8 ( 2018-08-01), p. 2573-2583
    Abstract: Unlike agricultural crops, most forest species have not had millennia of improvement through phenotypic selection, but can contribute energy and material resources and possibly help alleviate climate change. Yield gains similar to those achieved in agricultural crops over millennia could be made in forestry species with the use of genomic methods in a much shorter time frame. Here we compare various methods of genomic prediction for eight traits related to foliar terpene yield in Eucalyptus polybractea, a tree grown predominantly for the production of Eucalyptus oil. The genomic markers used in this study are derived from shallow whole genome sequencing of a population of 480 trees. We compare the traditional pedigree-based additive best linear unbiased predictors (ABLUP), genomic BLUP (GBLUP), BayesB genomic prediction model, and a form of GBLUP based on weighting markers according to their influence on traits (BLUP|GA). Predictive ability is assessed under varying marker densities of 10,000, 100,000 and 500,000 SNPs. Our results show that BayesB and BLUP|GA perform best across the eight traits. Predictive ability was higher for individual terpene traits, such as foliar α-pinene and 1,8-cineole concentration (0.59 and 0.73, respectively), than aggregate traits such as total foliar oil concentration (0.38). This is likely a function of the trait architecture and markers used. BLUP|GA was the best model for the two biomass related traits, height and 1 year change in height (0.25 and 0.19, respectively). Predictive ability increased with marker density for most traits, but with diminishing returns. The results of this study are a solid foundation for yield improvement of essential oil producing eucalypts. New markets such as biopolymers and terpene-derived biofuels could benefit from rapid yield increases in undomesticated oil-producing species.
    Type of Medium: Online Resource
    ISSN: 2160-1836
    URL: Article
    DOI: 10.1534/g3.118.200443
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2018
    detail.hit.zdb_id: 2629978-1
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  • 3
    Online Resource
    Online Resource
    High marker density GWAS provides novel insights into the genomic architecture of terpene oil yield in Eucalyptus
    Wiley ; 2019
    In:  New Phytologist Vol. 223, No. 3 ( 2019-08), p. 1489-1504
    Details
    In: New Phytologist, Wiley, Vol. 223, No. 3 ( 2019-08), p. 1489-1504
    Abstract: Terpenoid‐based essential oils are economically important commodities, yet beyond their biosynthetic pathways, little is known about the genetic architecture of terpene oil yield from plants. Transport, storage, evaporative loss, transcriptional regulation and precursor competition may be important contributors to this complex trait. Here, we associate 2.39 million single nucleotide polymorphisms derived from shallow whole‐genome sequencing of 468 Eucalyptus polybractea individuals with 12 traits related to the overall terpene yield, eight direct measures of terpene concentration and four biomass‐related traits. Our results show that in addition to terpene biosynthesis, development of secretory cavities, where terpenes are both synthesized and stored, and transport of terpenes were important components of terpene yield. For sesquiterpene concentrations, the availability of precursors in the cytosol was important. Candidate terpene synthase genes for the production of 1,8‐cineole and α‐pinene, and β‐pinene (which comprised 〉  80% of the total terpenes) were functionally characterized as a 1,8‐cineole synthase and a β/α‐pinene synthase. Our results provide novel insights into the genomic architecture of terpene yield and we provide candidate genes for breeding or engineering of crops for biofuels or the production of industrially valuable terpenes.
    Type of Medium: Online Resource
    ISSN: 0028-646X , 1469-8137
    URL: Issue
    URL: Article
    DOI: 10.1111/nph.2019.223.issue-3
    DOI: 10.1111/nph.15887
    Language: English
    Publisher: Wiley
    Publication Date: 2019
    detail.hit.zdb_id: 208885-X
    detail.hit.zdb_id: 1472194-6
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  • 4
    Online Resource
    Online Resource
    A phylogenomic approach reveals a low somatic mutation rate in a long-lived plant
    The Royal Society ; 2020
    In:  Proceedings of the Royal Society B: Biological Sciences Vol. 287, No. 1922 ( 2020-03-11), p. 20192364-
    Details
    In: Proceedings of the Royal Society B: Biological Sciences, The Royal Society, Vol. 287, No. 1922 ( 2020-03-11), p. 20192364-
    Abstract: Somatic mutations can have important effects on the life history, ecology, and evolution of plants, but the rate at which they accumulate is poorly understood and difficult to measure directly. Here, we develop a method to measure somatic mutations in individual plants and use it to estimate the somatic mutation rate in a large, long-lived, phenotypically mosaic Eucalyptus melliodora tree. Despite being 100 times larger than Arabidopsis, this tree has a per-generation mutation rate only ten times greater, which suggests that this species may have evolved mechanisms to reduce the mutation rate per unit of growth. This adds to a growing body of evidence that illuminates the correlated evolutionary shifts in mutation rate and life history in plants.
    Type of Medium: Online Resource
    ISSN: 0962-8452 , 1471-2954
    URL: Article
    DOI: 10.1098/rspb.2019.2364
    Language: English
    Publisher: The Royal Society
    Publication Date: 2020
    detail.hit.zdb_id: 1460975-7
    SSG: 12
    SSG: 25
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