Overexpression of Maize Mitogen-activated Protein Kinase Gene, ZmSIMK1 in Arabidopsis Increases Tolerance to Salt Stress

Overview

Journal Mol Biol Rep

Specialty Molecular Biology

Date 2010 Mar 27

PMID 20339925

Citations 26

Authors

Lingkun Gu

Yukun Liu

Xiaojuan Zong

Lixia Liu

Da-Peng Li

De-Quan Li

Affiliations

Soon will be listed here.

Abstract

Mitogen-activated protein kinase (MAPK) cascades play a remarkably crucial role in plants. It has been studied intensively in model plants Arabidopsis, tobacco and rice. However, the function of MAPKs in maize (Zea mays L.) has not been well documented. ZmSIMK1 (Zea mays salt-induced mitogen-activated protein kinase 1) is a previously identified MAPK gene in maize. In this research, we charactered ZmSIMK1 and showed that ZmSIMK1 was involved in Arabidopsis salt stress. The genomic organization of ZmSIMK1 gene and its expression in maize have been analyzed. In order to investigate the function of ZmSIMK1, we generated transgenic Arabidopsis constitutively overexpressing ZmSIMK1. Ectopic expression of ZmSIMK1 in Arabidopsis resulted in increased resistance against salt stress. Importantly, ZmSIMK1-overexpressing Arabidopsis exhibited constitutive expression of stress-responsive marker genes, RD29A and P5CS1. Furthermore, RD29A and P5CS1 were upregulated under salt stress. These results suggest that ZmSIMK1 may play an important role in plant salt stress.

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