Galactoglucomannan oligosaccharides inhibition of elongation growth is in pea epicotyls coupled with peroxidase activity

The effect of galactoglucomannan oligosaccharides — GGMOs, GGMOs-r (GGMOs with reduced reducing ends), and GGMOs-g (GGMOs with reduced number of d-galactose units) on peroxidase activity was determined in pea epicotyls. GGMOs didn’t significantly modify the activity of soluble peroxidases. However, cell wall-associated peroxidases activity increased after GGMOs and GGMOs-r treatment, while in the presence of GGMOs-g this activity was significantly lower. These results are inversely related to the GGMOs, GGMOs-r, and GGMOs-g effect on elongation growth induced by 2,4-D (2,4-dichlorophenoxyacetic acid) in pea epicotyls. It can be concluded that GGMOs evoked inhibition of the elongation growth induced by auxin is probably associated with cell wall modifications catalysed by peroxidase.