Journal
PLANTA
Volume 229, Issue 3, Pages 485-495Publisher
SPRINGER
DOI: 10.1007/s00425-008-0848-4
Keywords
Abscisic acid; Antioxidant defense system; Hydrogen peroxide; Mitogen-activated protein kinase
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Funding
- Nation Natural Science Foundation of China [30871457, 30471052]
- Program for Changjiang Scholars and Innovative Research Teams in Universities [IRT0635]
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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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