ZmMKK4 regulates osmotic stress through reactive oxygen species scavenging in transgenic tobacco

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作者单位: Taishan Med Univ, Tai An 271000, Shandong, Peoples R China Taishan Medical University Shandong Agr Univ, Coll Life Sci, State Key Lab Crop Biol, Shandong Key Lab Crop Biol, Tai An 271018, Shandong, Peoples R China Shandong Agricultural University

关键词: ACTIVATED PROTEIN-KINASE ABSCISIC-ACID SALT-STRESS ARABIDOPSIS-THALIANA TRANSCRIPTION FACTOR DROUGHT RESISTANCE GENE-EXPRESSION INNATE IMMUNITY MAPK CASCADES MEDIATES ABA

摘要: Mitogen-activated protein kinase kinase are important components of MAPK cascades, which are universal signal transduction modules and play important role in regulating both plant development and biotic or abiotic stress responses. In this study, we identified the group C MAPKK gene, ZmMKK4, in maize . Overexpression of ZmMKK4 in tobacco enhanced tolerance to osmotic stress by increased proline content and antioxidant enzyme activities compared with wild-type plants. RT-PCR revealed that one p...更多; Mitogen-activated protein kinase kinase are important components of MAPK cascades, which are universal signal transduction modules and play important role in regulating both plant development and biotic or abiotic stress responses. In this study, we identified the group C MAPKK gene, ZmMKK4, in maize . Overexpression of ZmMKK4 in tobacco enhanced tolerance to osmotic stress by increased proline content and antioxidant enzyme activities compared with wild-type plants. RT-PCR revealed that one peroxidase gene, NtPOX1, was higher in ZmMKK4-overexpressing plants than in the wild-type plants. In addition, the accumulation of reactive oxygen species in ZmMKK4-overexpressing plants is much less than that of wild-type plants. These results suggest that ZmMKK4 may be involved in ROS signaling. Taken together, these results indicate that ZmMKK4 is a positive regulator of osmotic stress by regulating scavenging of ROS in plants.收起

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