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Brennan M, Hedley PE, Topp CFE, et al. Development and Quality of Barley Husk Adhesion Correlates With Changes in Caryopsis Cuticle Biosynthesis and Composition. Front Plant Sci. 2019;10:672doi: 10.3389/fpls.2019.00672.
Brennan, M., Hedley, P. E., Topp, C. F. E., Morris, J., Ramsay, L., Mitchell, S., Shepherd, T., Thomas, W. T. B., & Hoad, S. P. (2019). Development and Quality of Barley Husk Adhesion Correlates With Changes in Caryopsis Cuticle Biosynthesis and Composition. Frontiers in plant science, 10672. https://doi.org/10.3389/fpls.2019.00672
Brennan, Maree, et al. "Development and Quality of Barley Husk Adhesion Correlates With Changes in Caryopsis Cuticle Biosynthesis and Composition." Frontiers in plant science vol. 10 (2019): 672. doi: https://doi.org/10.3389/fpls.2019.00672
Brennan M, Hedley PE, Topp CFE, Morris J, Ramsay L, Mitchell S, Shepherd T, Thomas WTB, Hoad SP. Development and Quality of Barley Husk Adhesion Correlates With Changes in Caryopsis Cuticle Biosynthesis and Composition. Front Plant Sci. 2019 May 24;10:672. doi: 10.3389/fpls.2019.00672. eCollection 2019. PMID: 31178883; PMCID: PMC6543523.
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Front Plant Sci. 2019 May 24;10:672. doi: 10.3389/fpls.2019.00672. eCollection 2019.

Development and Quality of Barley Husk Adhesion Correlates With Changes in Caryopsis Cuticle Biosynthesis and Composition.

Frontiers in plant science

Maree Brennan, Pete E Hedley, Cairistiona F E Topp, Jenny Morris, Luke Ramsay, Steve Mitchell, Tom Shepherd, William T B Thomas, Stephen P Hoad

Affiliations

  1. Scotland's Rural College, Edinburgh, United Kingdom.
  2. James Hutton Institute, Dundee, United Kingdom.
  3. Institute of Molecular Plant Sciences, University of Edinburgh, Edinburgh, United Kingdom.

PMID: 31178883 PMCID: PMC6543523 DOI: 10.3389/fpls.2019.00672

Abstract

The caryopses of barley become firmly adhered to the husk during grain development through a cuticular cementing layer on the caryopsis surface. The degree of this attachment varies among cultivars, with poor quality adhesion causing "skinning", an economically significant grain quality defect for the malting industry. Malting cultivars encompassing a range of husk adhesion qualities were grown under a misting treatment known to induce skinning. Development of the cementing layer was examined by electron microscopy and compositional changes of the cementing layer were investigated with gas-chromatography followed by mass spectroscopy. Changes in gene expression during adhesion development were examined with a custom barley microarray. The abundance of transcripts involved early in cuticular lipid biosynthesis, including those encoding acetyl-CoA carboxylase, and all four members of the fatty acid elongase complex of enzymes, was significantly higher earlier in caryopsis development than later. Genes associated with subsequent cuticular lipid biosynthetic pathways were also expressed higher early in development, including the decarbonylation and reductive pathways, and sterol biosynthesis. Changes in cuticular composition indicate that lowered proportions of alkanes and higher proportions of fatty acids are associated with development of good quality husk adhesion, in addition to higher proportions of sterols.

Keywords: barley (Hordeum vulgare); caryopsis; cementing layer; grain development; grain skinning; husk adhesion; plant cuticle

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