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Plant Growth Regulation
Pérez, F.J., Lab. Bioquímica Vegetal, Universidad de Chile, Casilla 653, Santiago, Chile
Vergara, R., Lab. Bioquímica Vegetal, Universidad de Chile, Casilla 653, Santiago, Chile
Or, E., Department of Fruit Tree Science,Institute of Horticulture, Agricultural Research Organization, The Volvani Center Bet Dagan, P.O. Box, 6, 50250 Bet Dagan, Israel
Sodium azide (NaN3), a well-known inhibitor of mitochondrial respiration, stimulated bud-dormancy release in grapevines similar to hydrogen cyanamide (HC), while HC, a well-known dormancy release agent, inhibited the O2 uptake in isolated grape bud mitochondria similarly to NaN3. Additionally, both chemicals induced transcript expression of the antioxidative enzyme glutathione reductase and glucose- 6-phosphate-dehydrogenase (G6PD), therefore upregulated the ascorbate-glutathione cycle (AGC) and the pentose phosphate pathway, respectively. As a result of AGC activation, the ratio of reduced to oxidized glutathione (GSH/GSSG) increased. Both stimuli also upregulated the transcription of 1,3-β-D-glucanase, a key enzyme in dormancy release. Together, these data support mechanistic connection between impaired Mit function and dormancy release, and suggests that as a consequence of O2 deprivation, increases in glycolysis and in ethanolic fermentation could be responsible for activation of downstream stages in the dormancy release mechanisms. © Springer Science+Business Media B.V. 2009.
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תנאי שימוש
On the mechanism of dormancy release in grapevine buds: A comparative study between hydrogen cyanamide and sodium azide
59
Pérez, F.J., Lab. Bioquímica Vegetal, Universidad de Chile, Casilla 653, Santiago, Chile
Vergara, R., Lab. Bioquímica Vegetal, Universidad de Chile, Casilla 653, Santiago, Chile
Or, E., Department of Fruit Tree Science,Institute of Horticulture, Agricultural Research Organization, The Volvani Center Bet Dagan, P.O. Box, 6, 50250 Bet Dagan, Israel
On the mechanism of dormancy release in grapevine buds: A comparative study between hydrogen cyanamide and sodium azide
Sodium azide (NaN3), a well-known inhibitor of mitochondrial respiration, stimulated bud-dormancy release in grapevines similar to hydrogen cyanamide (HC), while HC, a well-known dormancy release agent, inhibited the O2 uptake in isolated grape bud mitochondria similarly to NaN3. Additionally, both chemicals induced transcript expression of the antioxidative enzyme glutathione reductase and glucose- 6-phosphate-dehydrogenase (G6PD), therefore upregulated the ascorbate-glutathione cycle (AGC) and the pentose phosphate pathway, respectively. As a result of AGC activation, the ratio of reduced to oxidized glutathione (GSH/GSSG) increased. Both stimuli also upregulated the transcription of 1,3-β-D-glucanase, a key enzyme in dormancy release. Together, these data support mechanistic connection between impaired Mit function and dormancy release, and suggests that as a consequence of O2 deprivation, increases in glycolysis and in ethanolic fermentation could be responsible for activation of downstream stages in the dormancy release mechanisms. © Springer Science+Business Media B.V. 2009.
Scientific Publication
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