אסיף מאגר המחקר החקלאי

The transduction of the signal for grape bud dormancy breaking induced by hydrogen cyanamide may involve the SNF-like protein kinase GDBRPK

Year:

2000

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Volume :

43

Co-Authors:

Or, E., Department of Tree Breeding, Institute of Horticulture, Agricultural Research Organization, P.O.B. 6, Bet Dagan 50-250, Israel
Vilozny, I., Department of Tree Breeding, Institute of Horticulture, Agricultural Research Organization, P.O.B. 6, Bet Dagan 50-250, Israel
Eyal, Y., Department of Tree Breeding, Institute of Horticulture, Agricultural Research Organization, P.O.B. 6, Bet Dagan 50-250, Israel
Ogrodovitch, A., Department of Tree Breeding, Institute of Horticulture, Agricultural Research Organization, P.O.B. 6, Bet Dagan 50-250, Israel

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Abstract:

Alterations in gene expression during early stages of dormancy release in grapevine buds were analyzed to facilitate the identification of gene products that may mediate the signal transduction of a dormancy-release signal, or derepression of meristematic activity. In the present report we describe the identification of GDBRPK, a transcript for an SNF-like protein kinase that is up-regulated upon chemical induction of dormancy release by hydrogen cyanamide (HC). Since SNF and SNF-like protein kinases are known as sensors of stress signals, we hypothesize that GDBRPK may be involved in the perception of a stress signal induced by HC. We also describe a simultaneous and remarkable induction of both PDC and ADH transcripts that was observed shortly after HC application, and was of a transient nature. These data may imply that HC application leads to a transient respiratory stress, which likely results in a temporary increase in the AMP/ATP ratio. Since AMP is known as a stress signal that is sensed by SNF-like kinases, we suggest that the SNF-like GDBRPK could serve as the sensor of this signal.

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