The wheat PKABA1-interacting factor TaABF1 mediates both abscisic acid-suppressed and abscisic acid-induced gene expression in bombarded aleurone cells

The wheat PKABA1-interacting factor TaABF1 mediates both abscisic acid-suppressed and abscisic... To investigate the crosstalk of abscisic acid (ABA) and gibberellin (GA) signaling in wheat (Triticum aestivum), we have focused on the transcription factor TaABF1. TaABF1 (a member of the ABA response element binding factor family) physically interacts with PKABA1, a signaling component in the ABA-suppression of GA-induced gene expression in cereal grains. Constitutive expression of TaABF1 in aleurone cells of imbibing grains completely eliminated GA-induced expression from the Amy32b promoter. In addition to its effect on Amy32b, TaABF1 strongly stimulated expression from the ABA-inducible HVA1 and HVA22 promoters. Overexpression of TaABF1 fully substituted for exogenous ABA in the induction of these two promoters. The introduction of a construct directing RNA inhibition (RNAi) of TaABF1 did not prevent either ABA-mediated or PKABA1-mediated suppression of Amy32b expression. Similarly, the RNAi construct did not prevent ABA-induction of HVA1. These results suggest that another protein may act redundantly with TaABF1 during cereal imbibition. Although TaABF1 mRNA was downregulated during imbibition of afterripened grains, transcript levels were not significantly altered by exogenous GA or ABA, suggesting that upregulation of TaABF1 at the mRNA level is not required for its role in ABA signaling. We propose a model in which TaABF1 is involved in two separate branches of ABA signaling. In this model, TaABF1 acts downstream of PKABA1 in ABA-suppression of GA-induced gene expression, and participates (independently of PKABA1) in the stimulation of ABA-induced genes. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant Molecular Biology Springer Journals

The wheat PKABA1-interacting factor TaABF1 mediates both abscisic acid-suppressed and abscisic acid-induced gene expression in bombarded aleurone cells

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Publisher
Springer Journals
Copyright
Copyright © 2008 by Springer Science+Business Media B.V.
Subject
Life Sciences; Plant Pathology; Biochemistry, general; Plant Sciences
ISSN
0167-4412
eISSN
1573-5028
D.O.I.
10.1007/s11103-008-9354-0
Publisher site
See Article on Publisher Site

Abstract

To investigate the crosstalk of abscisic acid (ABA) and gibberellin (GA) signaling in wheat (Triticum aestivum), we have focused on the transcription factor TaABF1. TaABF1 (a member of the ABA response element binding factor family) physically interacts with PKABA1, a signaling component in the ABA-suppression of GA-induced gene expression in cereal grains. Constitutive expression of TaABF1 in aleurone cells of imbibing grains completely eliminated GA-induced expression from the Amy32b promoter. In addition to its effect on Amy32b, TaABF1 strongly stimulated expression from the ABA-inducible HVA1 and HVA22 promoters. Overexpression of TaABF1 fully substituted for exogenous ABA in the induction of these two promoters. The introduction of a construct directing RNA inhibition (RNAi) of TaABF1 did not prevent either ABA-mediated or PKABA1-mediated suppression of Amy32b expression. Similarly, the RNAi construct did not prevent ABA-induction of HVA1. These results suggest that another protein may act redundantly with TaABF1 during cereal imbibition. Although TaABF1 mRNA was downregulated during imbibition of afterripened grains, transcript levels were not significantly altered by exogenous GA or ABA, suggesting that upregulation of TaABF1 at the mRNA level is not required for its role in ABA signaling. We propose a model in which TaABF1 is involved in two separate branches of ABA signaling. In this model, TaABF1 acts downstream of PKABA1 in ABA-suppression of GA-induced gene expression, and participates (independently of PKABA1) in the stimulation of ABA-induced genes.

Journal

Plant Molecular BiologySpringer Journals

Published: May 31, 2008

References

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