Abstract
Mitogen-activated protein kinase (MAPK) cascades are involved in biotic and abiotic stress responses. In plants, MAPKs are classified into four groups, designated A–D. Information about group C MAPKs is limited, and, in particular, no data from maize are available. In this article, we isolated a novel group C MAPK gene, ZmMPK7, from Zea mays. Exogenous abscisic acid (ABA) and hydrogen peroxide (H2O2) induced calcium-dependant transcription of ZmMPK7. Induction of this gene in response to ABA was blocked by several reactive oxygen species (ROS) manipulators such as imidazole, Tiron, and dimethylthiourea (DMTU). This result indicates that endogenous H2O2 may be required for ZmMPK7-mediated ABA signaling. Expression of ZmMPK7 in Nicotonia tobaccum caused less H2O2 to accumulate and alleviated ROS-mediated injuries following submission of the plants to osmotic stress. The enhanced total peroxidase (POD) activity in transgenic tobacco plants may contribute to removal of ROS. Finally, we have shown that the ZmMPK7 protein localizes in the nucleus. These results broaden our knowledge regarding plant group C MAPK activity in response to stress signals.
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Abbreviations
- ABA:
-
Abscisic acid
- CaMV:
-
Cauliflower mosaic virus
- DMTU:
-
Dimethylthiourea
- DAB:
-
3,3′-Diaminobenzidine
- GFP:
-
Green fluorescent protein
- H2O2 :
-
Hydrogen peroxide
- JA:
-
Jasmonic acid
- MDA:
-
Malondialdehyde
- PAGE:
-
Polyacrylamide gel electrophoresis
- POD:
-
Peroxidase
- ROS:
-
Reactive oxygen species
- SA:
-
Salicylic acid
- SOD:
-
Superoxide dismutase
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Acknowledgments
The authors gratefully acknowledge the help from Plant Developmental Biology Laboratory in Shandong Agricultural University, China. This work was supported by the Grants from the Nation Natural Science Foundation of China (No. 30871457, 30471052) and the Program for Changjiang Scholars and Innovative Research Teams in Universities (No. IRT0635).
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Zong, Xj., Li, Dp., Gu, Lk. et al. Abscisic acid and hydrogen peroxide induce a novel maize group C MAP kinase gene, ZmMPK7, which is responsible for the removal of reactive oxygen species. Planta 229, 485–495 (2009). https://doi.org/10.1007/s00425-008-0848-4
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DOI: https://doi.org/10.1007/s00425-008-0848-4