A rapid transcriptional activation is induced by the dormancy-breaking chemical hydrogen cyanamide in kiwifruit (Actinidia deliciosa) buds

Walton, E.F., Wu, R.M., Richardson, A.C., Davy, M., Hellens, R.P., Thodey, K., Janssen, B.J., Gleave, A.P., Rae, G.M., Wood, M., & Schaffer, R.J. (2009) A rapid transcriptional activation is induced by the dormancy-breaking chemical hydrogen cyanamide in kiwifruit (Actinidia deliciosa) buds. Journal of Experimental Botany, 60(13), pp. 3835-3848.

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Abstract

Budbreak in kiwifruit (Actinidia deliciosa) can be poor in locations that have warm winters with insufficient winter chilling. Kiwifruit vines are often treated with the dormancy-breaking chemical hydrogen cyanamide (HC) to increase and synchronize budbreak. This treatment also offers a tool to understand the processes involved in budbreak. A genomics approach is presented here to increase our understanding of budbreak in kiwifruit. Most genes identified following HC application appear to be associated with responses to stress, but a number of genes appear to be associated with the reactivation of growth. Three patterns of gene expression were identified: Profile 1, an HC-induced transient activation; Profile 2, an HC-induced transient activation followed by a growth-related activation; and Profile 3, HC- and growth-repressed. One group of genes that was rapidly up-regulated in response to HC was the glutathione S-transferase (GST) class of genes, which have been associated with stress and signalling. Previous budbreak studies, in three other species, also report up-regulated GST expression. Phylogenetic analysis of these GSTs showed that they clustered into two sub-clades, suggesting a strong correlation between their expression and budbreak across species.

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ID Code: 71617
Item Type: Journal Article
Refereed: Yes
Additional Information: Articles free to read on journal website after 12 months
Additional URLs:
Keywords: Actinidia deliciosa, Bud dormancy, Budbreak, Glutathione S-transferase, Hydrogen cyanamide, Kiwifruit, Microarray
DOI: 10.1093/jxb/erp231
ISSN: 1460-2431
Divisions: Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 15 May 2014 03:42
Last Modified: 06 Feb 2015 02:44

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