אסיף מאגר המחקר החקלאי

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

Year:

2008

Source of publication :

Authors :

Volume :

228

Co-Authors:

Halaly, T., Department of Fruit Tree Sciences, Institute of Horticulture, Volcani Center, Bet Dagan, P.O. Box 6, Bet Dagan 50250, Israel
Pang, X., Department of Fruit Tree Sciences, Institute of Horticulture, Volcani Center, Bet Dagan, P.O. Box 6, Bet Dagan 50250, Israel, College of Life Sciences, South China Agricultural University, Guangzhou 510642, China
Batikoff, T., Department of Fruit Tree Sciences, Institute of Horticulture, Volcani Center, Bet Dagan, P.O. Box 6, Bet Dagan 50250, Israel
Crane, O., Department of Fruit Tree Sciences, Institute of Horticulture, Volcani Center, Bet Dagan, P.O. Box 6, Bet Dagan 50250, Israel
Keren, A., Department of Fruit Tree Sciences, Institute of Horticulture, Volcani Center, Bet Dagan, P.O. Box 6, Bet Dagan 50250, Israel
Venkateswari, J., Department of Fruit Tree Sciences, Institute of Horticulture, Volcani Center, Bet Dagan, P.O. Box 6, Bet Dagan 50250, Israel, Department of Botany and Plant Sciences, University of California, 2150 BatchelorHall, Riverside, CA 92521, United States
Ogrodovitch, A., Department of Fruit Tree Sciences, Institute of Horticulture, Volcani Center, Bet Dagan, P.O. Box 6, Bet Dagan 50250, Israel
Sadka, A., Department of Fruit Tree Sciences, Institute of Horticulture, Volcani Center, Bet Dagan, P.O. Box 6, Bet Dagan 50250, Israel
Lavee, S., Department of Fruit Tree Sciences, Institute of Horticulture, Volcani Center, Bet Dagan, P.O. Box 6, Bet Dagan 50250, Israel
Or, E., Department of Fruit Tree Sciences, Institute of Horticulture, Volcani Center, Bet Dagan, P.O. Box 6, Bet Dagan 50250, Israel

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Abstract:

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. © 2008 Springer-Verlag.

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