Abstract
Studies of abscisic acid (ABA) and auxin have revealed that these pathways impinge on each other. The Daucus carota (L.) Dc3 promoter: uidA (β-glucuronidase: GUS) chimaeric reporter (ProDc3:GUS) is induced by ABA, osmoticum, and the auxin indole-3-acetic acid (IAA) in vegetative tissues of transgenic Arabidopsis thaliana (L.) Heynh. Here, we describe the root tissue-specific expression of ProDc3:GUS in the ABA-insensitive-2 (abi2-1), auxin-insensitive-1 (aux1), auxin-resistant-4 (axr4), and rooty (rty1) mutants of Arabidopsis in response to ABA, IAA and synthetic auxins naphthalene acetic acid (NAA), and 2, 4-(dichlorophenoxy) acetic acid. Quantitative analysis of ProDc3:GUS expression showed that the abi2-1 mutant had reduced GUS activity in response to ABA, IAA, or 2, 4-d, but not to NAA. Similarly, chromogenic staining of ProDc3:GUS activity showed that the aux1 and axr4 mutants gave predictable hypomorphic ProDc3:GUS expression phenotypes in roots treated with IAA or 2, 4-d, but not the diffusible auxin NAA. Likewise the rty mutant, which accumulates auxin, showed elevated ProDc3:GUS expression in the absence or presence of hormones relative to wild type. Interestingly, the aux1 and axr4 mutants showed a hypomorphic effect on ABA-inducible ProDc3:GUS expression, demonstrating that ABA and IAA signaling pathways interact in roots. Possible mechanisms of crosstalk between ABA and auxin signaling are discussed.
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Abbreviations
- ABA:
-
Abscisic acid
- ABI:
-
ABA-insensitive
- AREBs=ABFs:
-
ABA-Response Element Binding Factors
- ARFs:
-
Auxin-responsive factors
- GFP:
-
Green fluorescent protein
- IAA:
-
Indole-3-acetic acid
- IBA:
-
Indole-3-butyric acid
- GUS:
-
β-glucuronidase (uidA)
- 2, 4-D:
-
2, 4-(dichlorophenoxy)acetic acid
- DPBFs:
-
Dc3 Promoter Binding Factors
- LEA:
-
Late-Embryogenesis-Abundant
- NAA:
-
Naphthalene acetic acid
- 4-MU:
-
4-methylumbelliferone
- The 1.5 kbp promoter of Dc3 :
-
ProDc3
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Acknowledgements
The authors thank Terry Thomas, Texas A&M University, for the gift of ProDc3:GUS transgenic Arabidopsis, the anonymous reviewers for their helpful comments, and Kevin Lee, HKUST, for encouragement. This work was funded by Hong Kong Government CERG HKUST 6134/99M and a 2003 Research Enhancement Fund grant from the Texas Tech University Institute for University Research to C.D.R.
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Rock, C.D., Sun, X. Crosstalk between ABA and auxin signaling pathways in roots of Arabidopsis thaliana (L.) Heynh.. Planta 222, 98–106 (2005). https://doi.org/10.1007/s00425-005-1521-9
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DOI: https://doi.org/10.1007/s00425-005-1521-9