Differential Effect of Auxin on Molecular Weight Distributions of Xyloglucans in Cell Walls of Outer and Inner Tissues from Segments of Dark Grown Squash (Cucurbita maxima Duch.) Hypocotyls

摘要: Effects of indole-3-acetic acid (IAA) on the mechanical properties cell walls and structures wall polysaccharides in outer inner tissues segments dark grown squash (Cucurbita maxima Duch.) hypocotyls were investigated. IAA induced elongation unpeeled, intact segments, but had no effect peeled segments. loosening as studied by stress-relaxation analysis not tissues. IAA-induced changes net sugar content fractions very small. Extracted hemicellulosic xyloglucans derived from a molecular weight about two times large tissues, both decreased during incubation. substantially accelerated depolymerization while it prevented that These results suggest growth is due to IAA-accelerated involved processes.