Abstract
Aluminum (Al3+) has been recognized as a main toxic factor in crop production in acid lands. Phosphatidic acid (PA) is emerging as an important lipid signaling molecule and has been implicated in various stress-signaling pathways in plants. In this paper, we focus on how PA generation is affected by Al3+ using Coffea arabica suspension cells. We pre-labeled cells with [32P]orthophosphate (32Pi) and assayed for 32P-PA formation in response to Al3+. Treating cells for 15 min with either AlCl3 or Al(NO3)3 inhibited the formation of PA. In order to test how Al3+ affected PA signaling, we used the peptide mastoparan-7 (mas-7), which is known as a very potent stimulator of PA formation. The Al3+ inhibited mas-7 induction of PA response, both before and after Al3+ incubation. The PA involved in signaling is generated by two distinct phospholipid signaling pathways, via phospholipase D (PLD; EC: 3.1.4.4) or via Phospholipase C (PLC; EC: 3.1.4.3), and diacylglycerol kinase (DGK; EC 2.7.1.107). By labeling with 32Pi for short periods of time, we found that PA formation was inhibited almost 30% when the cells were incubated with AlCl3 suggesting the involvement of the PLC/DGK pathway. Incubation of cells with PLC inhibitor, U73122, affected PA formation, like AlCl3 did. PLD in vivo activation by mas-7 was reduced by Al3+. These results suggest that PA formation was prevented through the inhibition of the PLC activity, and it provides the first evidence for the role of Al toxicity on PA production.








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Abbreviations
- ABA:
-
Abscisic acid
- DAG:
-
Diacylglycerol
- DGK:
-
Diacylglycerol kinase
- DGPP:
-
Diacylglycerol pyrophosphate
- EtAc:
-
Ethyl acetate
- IP3 :
-
Inositol 1,4,5-trisphosphate
- LPA:
-
Lyso-phosphatidic acid
- PC:
-
Phosphatidylcholine
- PIP:
-
Phosphatidylinositol 4-phosphate
- PIP2 :
-
Phosphatidylinositol 4,5-bisphosphate
- Pbut:
-
Phosphatidylbutanol
- PLC:
-
Phospholipase C
- PLD:
-
Phospholipase D
- PA:
-
Phosphatidic acid
- PCA:
-
Perchloric acid
- PEPC:
-
Phosphoenolpyruvate carboxylase
- 32Pi:
-
[32P]orthophosphate
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Acknowledgments
The authors thank Rafael Tobeña and Armando Muñoz-Sánchez for their technical assistance. This work was supported by Consejo Nacional de Ciencia y Tecnología grant to SMTH-S (45798-Z) and a fellowship to AR-D (165087). T. Munnik’s lab is financially supported by the Netherlands Organization for Scientific Research (NWO; CW 99002, ALW 863.04.004), The European Commission (HP RN-CT-2002-00251), and the Royal Netherlands Academy of Arts and Sciences (KN AW).
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Ramos-Díaz, A., Brito-Argáez, L., Munnik, T. et al. Aluminum inhibits phosphatidic acid formation by blocking the phospholipase C pathway. Planta 225, 393–401 (2007). https://doi.org/10.1007/s00425-006-0348-3
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DOI: https://doi.org/10.1007/s00425-006-0348-3


