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Regulation of glucose metabolism and cell wall synthesis in avena sativa stem segments by gibberellic acid


, : Regulation of glucose metabolism and cell wall synthesis in avena sativa stem segments by gibberellic acid. Plant Physiology (Rockville) 62(3): 391-396

GA stimulated both the elongation of A. sativa stem segments and increased synthesis of cell wall material. The effects of GA on glucose metabolism, as related to cell wall synthesis, were investigated in order to find specific events regulated by GA. GA caused a decline in the levels of glucose, G6P and fructose 6-phosphate if exogenous sugar was not supplied to the segments, whereas the hormone caused no change in the levels of G6P, fructose 6-phosphate, UDP-glucose or the adenylate energy charge if the segments were incubated in 0.1 M glucose. No GA-induced change was demonstrated in the activities of hexokinase, phosphoglucomutase, UDP-glucose pyrophosphorylase or polysaccharide synthetases using UDP-glucose, UDP-galactose, UDP-xylose and UDP-arabinose as substrates. GA stimulated the activity of GDP-glucose-dependent .beta.-glucan synthetase by 2- to 4-fold over the control. When glucan synthetase was assayed using UDP-glucose as substrate, only .beta.-1,3-linked glucan was synthesized in vitro, whereas with GDP-glucose, only .beta.-1,4-linked glucan was synthesized. These results suggest that one part of the mechanism by which GA stimulates cell wall synthesis concurrently with elongation in Avena stem segments may be through a stimulation of cell wall polysaccharide synthetase activity.

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Related references

Montague, M.J.; Ikuma, H., 1978: Regulation of glucose metabolism and cell wall synthesis in Avena stem segments by gibberellic Acid. Gibberellic acid (GA) stimulated both the elongation of Avena sativa stem segments and increased synthesis of cell wall material. The effects of GA on glucose metabolism, as related to cell wall synthesis, have been investigated in order to find s...

Montague, M.J.; Ikuma, H., 1968: Regulation of glucose metabolism and cell wall synthesis in Avena stem segments by gibberellic acid. The effects of GA on glucose metabolism, in relation to cell wall synthesis, were investigated using oat stem segments to find specific events regulated by GA. GA caused a decline in the conc. of glucose, glucose 6-phosphate and fructose 6-phospha...

Montague, M.J.; Ikuma, H., 1975: Regulation of cell wall synthesis in avena sativa stem segments by gibberellic acid. Plant Physiology (Rockville) 55(6): 1043-1047

Montague, M.J.; Ikuma, H., 1975: Regulation of cell wall synthesis in Avena stem segments by gibberellic Acid. In oat stem sections, elongation in the presence of GA depended on the amount of GA taken up by the segment. GA could be applied as a short pulse at 300 mu M for 5 min but to give the highest response it must be applied immediately after excision....

Kaufman P.B.; Jones R.A., 1974: Regulation of growth in avena sativa oat stem segments by gibberellic acid and abscisic acid. Physiologia Plantarum 31(1): 39-43

Kaufman, P.B.; Ghosheh, N.S.; Lacroix, J.D.; Soni, S.L.; Ikuma, H., 1973: Regulation of invertase levels in Avena stem segments by gibberellic Acid, sucrose, glucose, and fructose. In oat stem segments, application of GA increased soluble invertase activity during active growth and retarded the decline in activity after growth had ceased. Pulse treatments with GA gave a greater increase in invertase activity in segments trea...

Adams, P.A.; Montague, M.J.; Tepfer, M.; Rayle, D.L.; Ikuma, H.; Kaufman, P.B., 1975: Effect of gibberellic acid on the plasticity and elasticity of avena sativa stem segments. Plant Physiology (Rockville) 56(6): 757-760

Jusaitis, M.; Paleg, L.G.; Aspinall, D., 1981: Effects of temperature and gibberellic acid on 4-desmethylsterol composition of Avena sativa stem segments. Of the 3 morphological subunits of oat stem segments (node, leaf sheath and internode) examined, internodes constituted the richest source of phospholipids and sterols, yielding almost double the conc. of lipid found in the leaf sheath. The phosph...

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Jusaitis, M.; Paleg, L.G.; Aspinall, D., 1982: The Influence of Gibberellic Acid and Temperature on the Growth Rate of Avena sativa Stem Segments. 2.0-cm segments of stem internodes of oats cv. Avon were incubated at different temp. in 0, 10-8, 10-7, 10-6 or 10-4 M GA and their extension measured using a microgrowth measuring technique. Extension rate increased with increasing GA conc. and w...