Study of Dynamic Accumulation in beta-D-Glucan in Oat (Avena sativa L.) during Plant Development

Oat is an important natural source of beta-D-glucan. This polysaccharide of the cell wall of selected cereals is known for a number of health-promoting effects, such as reducing the level of cholesterol in the blood serum, stabilizing the level of blood glucose, or enhancing immunity. beta-D-glucan has positive effects in the plant itself. There is a lack of information available, but the storage capacity of the polysaccharide and its importance as a protective substance in the plant during mild forms of biotic and abiotic stress are described. The accumulation of beta-D-glucan during the ontogenetic development of oats (Avena sativa L.) was determined in the present work. Two naked (Valentin, Vaclav) and two hulled (Hronec, Tatran) oat varieties were used. Samples of each plant (root, stem, leaf, panicle) were collected in four stages of the plant's development (BBCH 13, 30, 55, 71). The average content of the biopolymer was 0.29 +/- 0.14% in roots, 0.32 +/- 0.11% in stems, 0.48 +/- 0.13% in leaves and 1.28 +/- 0.79% in panicles, respectively. For root and panicle, in both hulled and naked oat varieties, sampling date was the factor of variability in the content of beta-D-glucan. In stems in hulled varieties and leaves in naked varieties, neither the sampling date nor variety influenced the polysaccharide content. The content of beta-D-glucan in the leaves of hulled and naked varieties decreased during the first three stages of plant development, but in the stage of milk ripeness the amount increased. The decreasing trend during milk ripeness, was also observed in the roots of both hulled and naked oats. However, in the panicle of hulled and naked oat varieties, the content of beta-D-glucan increased during plant growth. Due to practical applications of natural resources of beta-D-glucan and isolated beta-D-glucan is useful to know the factors influencing its content as well as to ascertain the behavior of the polysaccharide during plant development.