Identification of high beta-glucan oat lines and localization and chemical characterization of their seed kernel beta-glucans

Oat, (Avena sativa) is an excellent source of mixed linkage beta-glucans ((1 -> 3)(1 -> 4)-beta-D-glucan), a dietary fibre with cholesterol lowering properties. Using a mutagenized oat-population we screened 1700 different lines and identified ten lines that displayed beta-glucan levels above 6.7% and 10 below 3.6%. The extreme values were 1.8% and 7.5%. We chose six lines with an increased- and four lines with a reduced beta-glucan content for further study. By longitudinal- and cross-sections of seeds it was shown that localization of beta-glucan varied between the different lines. In addition, beta-glucan quality parameters like molecular weight and solubility were also determined. Although the selection was designed for quantitative differences, qualitative differences between the beta-glucans from the different lines were found. The high and low beta-glucan lines will now be used as a model system to study molecular regulation of beta-glucan biosynthesis as well as possible links between fibre quality and biological activity. (C) 2012 Elsevier Ltd. All rights reserved.