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Type: Journal article
Title: Over-expression of specific HvCslF cellulose synthase-like genes in transgenic barley increases the levels of cell wall (1,3;1,4)-β-D-glucans and alters their fine structure
Other Titles: Over-expression of specific HvCslF cellulose synthase-like genes in transgenic barley increases the levels of cell wall (1,3;1,4)-beta-D-glucans and alters their fine structure
Author: Burton, R.
Collins, H.
Kibble, N.
Gilson, J.
Shirley, N.
Jobling, S.
Henderson, M.
Singh, R.
Pettolino, F.
Wilson, S.
Bird, A.
Topping, D.
Bacic, A.
Fincher, G.
Citation: Plant Biotechnology Journal, 2011; 9(2):117-135
Publisher: Blackwell Publishing Ltd.
Issue Date: 2011
ISSN: 1467-7644
Statement of
Rachel A. Burton, Helen M. Collins, Natalie A. J. Kibble, Jessica A. Smith, Neil J. Shirley, Stephen A.Jobling, Marilyn Henderson, Rohan R. Singh, Filomena Pettolino, Sarah M. Wilson, Anthony R. Bird, David L. Topping, Antony Bacic and Geoffrey B. Fincher
Abstract: Cell walls in commercially important cereals and grasses are characterized by the presence of (1,3;1,4)-β-D-glucans. These polysaccharides are beneficial constituents of human diets, where they can reduce the risk of hypercholesterolemia, type II diabetes, obesity and colorectal cancer. The biosynthesis of cell wall (1,3;1,4)- β-D-glucans in the Poaceae is mediated, in part at least, by the cellulose synthase-like CslF family of genes. Over-expression of the barley CslF6 gene under the control of an endosperm-specific oat globulin promoter results in increases of more than 80% in (1,3;1,4)-β-D-glucan content in grain of transgenic barley. Analyses of (1,3;1,4)-β-D-glucan fine structure indicate that individual CslF enzymes might direct the synthesis of (1,3;1,4)-β-D-glucans with different structures. When expression of the CslF6 transgene is driven by the Pro35S promoter, the transgenic lines have up to sixfold higher levels of (1,3;1,4)-β-D-glucan in leaves, but similar levels as controls in the grain. Some transgenic lines of Pro35S:CslF4 also show increased levels of (1,3;1,4)-β-D-glucans in grain, but not in leaves. Thus, the effects of CslF genes on (1,3;1,4)-β-D-glucan levels are dependent not only on the promoter used, but also on the specific member of the CslF gene family that is inserted into the transgenic barley lines. Altering (1,3;1,4)-b-D-glucan levels in grain and vegetative tissues will have potential applications in human health, where (1,3;1,4)-β-D-glucans contribute to dietary fibre, and in tailoring the composition of biomass cell walls for the production of bioethanol from cereal crop residues and grasses.
Keywords: Cell wall polysaccharides; cereals; dietary fibre; genetic engineering; grasses; promoter specificity
Rights: Plant Biotechnology Journal © 2010 Society for Experimental Biology, Association of Applied Biologists and Blackwell Publishing LtdNo claim to original US government works
RMID: 0020102406
DOI: 10.1111/j.1467-7652.2010.00532.x
Appears in Collections:Agriculture, Food and Wine publications

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