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Similar mechanisms might be triggered by alternative external stimuli that induce dormancy release in grape buds

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The detection of genes having similar expression profiles following the application of different stimuli that trigger bud break may constitute potent tools for the identification of pathways with a central role in dormancy release. We compared the effects of heat shock (HS) and hydrogen cyanamide (HC) and demonstrated that HS leads to earlier and higher bud-break levels. Changes in transcript levels of catalase, alcohol dehydrogenase and pyruvate decarboxylase were induced following both treatments. However, timing and extent of changes in transcript level differed. Changes occurred earlier in HS-treated buds and were more intense in HC-treated buds. The changes in transcript levels after both treatments were temporary. The rapid and short-lasting changes in gene expression following HS treatment correlated with the faster and higher level of bud-break that this treatment exerted. This correlation may propose that the reported molecular events are mechanistically involved in dormancy release. To test the hypothesis that temporary oxidative stress is part of the mechanism inducing dormancy release, we analyzed the effect of HS and HC treatments on the expression of ascorbate peroxidase, glutathione reductase, thioredoxin h, glutathione S-transferase and sucrose synthase genes and found that they were induced by both treatments in a similar pattern. Taken together, these findings propose that similar cellular processes might be triggered by different stimuli that lead to dormancy release, and are consistent with the hypothesis that temporary oxidative stress and respiratory stress might be part of the mechanism that leads to bud break.

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Alcohol dehydrogenase


Ascorbate peroxidase




Calcium-dependent protein kinase


Expressed sequence tag


Glutathione reductase


Glutathione S-transferase


Hydrogen cyanamide


Heat shock


Pyruvate decarboxylase


Relative expression


Reactive oxygen species


Sodium dodecyl sulfate


Stilben synthase


Sucrose synthase


Thioredoxin h


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This research was supported by Research Grant Award No. IS-3340-02 from BARD, The United States-Israel Binational Agricultural Research and Development Fund.

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Correspondence to Etti Or.

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T. Halaly and X. Pang contributed equally to the paper.

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Halaly, T., Pang, X., Batikoff, T. et al. Similar mechanisms might be triggered by alternative external stimuli that induce dormancy release in grape buds. Planta 228, 79–88 (2008). https://doi.org/10.1007/s00425-008-0720-6

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  • Bud dormancy
  • Heat shock
  • Hydrogen cyanamide
  • Oxidative stress
  • Vitis