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Functional analysis of TaABF1 during abscisic acid and gibberellin signalling in aleurone cells of cereal grains

Published online by Cambridge University Press:  08 April 2013

Lauren J. Harris ,
Sarah A. Martinez ,
Benjamin R. Keyser ,
William E. Dyer  and
Russell R. Johnson
Lauren J. Harris
Affiliation:
Department of Biology, Colby College, 5723 Mayflower Hill, Waterville, ME 04901, USA
Sarah A. Martinez
Affiliation:
Department of Biology, Colby College, 5723 Mayflower Hill, Waterville, ME 04901, USA
Benjamin R. Keyser
Affiliation:
Department of Biology, Colby College, 5723 Mayflower Hill, Waterville, ME 04901, USA
William E. Dyer
Affiliation:
Department of Plant Sciences and Plant Pathology, Montana State University, Bozeman, MT 59715, USA
Russell R. Johnson*
Affiliation:
Department of Biology, Colby College, 5723 Mayflower Hill, Waterville, ME 04901, USA
*
*Correspondence E-mail: [email protected]
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Abstract

The wheat transcription factor TaABF1 physically interacts with the protein kinase PKABA1 and mediates both abscisic acid (ABA)-induced and ABA-suppressed gene expression. In bombarded aleurone cells of imbibing grains, the effect of TaABF1 in down-regulating the gibberellin (GA)-induced Amy32b promoter was stronger in the presence of exogenous ABA. As these grains contained low levels of endogenous ABA, the effect of TaABF1 may also be mediated by ABA-induced activation even in the absence of exogenous ABA. Levels of TaABF1 protein decreased slightly during imbibition of afterripened grains. However, TaABF1 levels (especially in aleurone layers) were not substantially affected by exogenous ABA or GA, indicating that changes in TaABF1 protein level are not an important part of regulating its role in hormone signalling. We found that TaABF1 was phosphorylated in vivo in aleurone cells, suggesting a role for post-translational modification in regulating TaABF1 activity. Induction of Amy32b by overexpression of the transcription factor GAMyb could not be prevented by TaABF1, indicating that TaABF1 acts upstream of GAMyb transcription in the signalling pathway. Supporting this view, knockdown of TaABF1 by RNA interference resulted in increased expression from the GAMyb promoter. These results are consistent with a model in which TaABF1 is constitutively present in aleurone cells, while its ability to down-regulate GAMyb is regulated in response to ABA.

Keywords

abscisic acidgerminationgibberellinimbibitionwheat
Type
Research Papers
Information
Seed Science Research , Volume 23 , Issue 2 , June 2013 , pp. 89 - 98
Copyright
Copyright © Cambridge University Press 2013 

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