EurekaMag.com logo
+ Site Statistics
References:
52,725,316
Abstracts:
28,411,598
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

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


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


Accession: 006288075



Related references

Regulation of glucose metabolism and cell wall synthesis in Avena stem segments by gibberellic Acid. Plant Physiology 62(3): 391-396, 1978

Regulation of glucose metabolism and cell wall synthesis in Avena stem segments by gibberellic acid. Plant Physiology 62(3): 391-396, 1968

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

Regulation of cell wall synthesis in Avena stem segments by gibberellic Acid. Plant Physiology 55(6): 1043-1047, 1975

Regulation of growth in avena sativa oat stem segments by gibberellic acid and abscisic acid. Physiologia Plantarum 31(1): 39-43, 1974

Regulation of invertase levels in Avena stem segments by gibberellic Acid, sucrose, glucose, and fructose. Plant Physiology 52(3): 221-228, 1973

Effect of gibberellic acid on the plasticity and elasticity of avena sativa stem segments. Plant Physiology (Rockville) 56(6): 757-760, 1975

Effects of temperature and gibberellic acid on 4-desmethylsterol composition of Avena sativa stem segments. Phytochemistry 20(3): 417-423, 1981

Correlation between the Lipid Composition and the Responsiveness of Avena sativa Stem Segments to Gibberellic Acid. Plant Physiology 70(5): 1486-1494, 1982

The Influence of Gibberellic Acid and Temperature on the Growth Rate of Avena sativa Stem Segments. Plant Physiology 70(2): 532-539, 1982