The role of Î²-glucan in barley

G.D. Coles; S.J. Roberts; R.C. Butler; M.K. Morrell; J.S. Rowarth

The role of Î²-glucan in barley

äºDietary fibre components and functions

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G.D. Coles

G.D. Coles ¹Successors Wine Group, New Zealand

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S.J. Roberts

S.J. Roberts ¹Successors Wine Group, New Zealand

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R.C. Butler

R.C. Butler ¹Successors Wine Group, New Zealand

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M.K. Morrell

M.K. Morrell ²CSIRO Division of Plant Industry, Canberra, Australia

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J.S. Rowarth

J.S. Rowarth ³Massey University, Palmerston North, New Zealand

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Page Range:: 65â74

DOI:: https://doi.org/10.3920/978-90-8686-622-9_004

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The role of barley Î²-glucan in enhancing human health and well-being is growing, so plant breeders and agronomists are giving new attention to maximising its content in the grain. Î²-glucan was originally considered to be a cell wall component with an unknown role, but recent re-analysis of historical data shows it is turned over during grain growth and development, suggesting a role as an assimilate buffer. Thus, agronomists have to find ways to manage the crop close to harvest to maximise Î²-glucan content. Close investigation of the process by which Î²-glucan is remobilised during grain hydration indicates a role for an endosperm membrane-bound enzyme, activated by a water-soluble component of the outer layers of the grain, available only when the grain has broken dormancy. Although not found in the bran of grains other than barley, this activity is also present in oat and barley coleoptile tissue. We hypothesise that barley has co-opted a mechanism for rapid cell wall growth in the growing grass shoot to protect and remobilise assimilate. Better understanding of this behaviour will help breeders to increase the production of this valuable plant component. The consequence of this native enzyme activity for the molecular weight of Î²-glucan in foods is discussed.

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Dietary fibre components and functions

ISBN:: 9789086866229

åºçç¤¾:: Wageningen Academic

å°å·åºçæ¥æ:: 24 Oct 2007

Subjects
- Life Sciences

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The role of Î²-glucan in barley

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