Transcriptional regulation of a rice mitogen-activated protein kinase gene, OsMAPK4, in response to environmental stresses.
Mitogen-activated protein kinase (MAPK) cascades play important roles in signal transduction of extracellular stimuli in eukaryotes. However, stimulatory signals for plant MAPKs have not been well elucidated. Here, a cDNA clone, termed Oryza sativa MAPK4 (OsMAPK4), from rice encoding a protein that showed homology with the eukaryotic MAPKs was isolated. According to the phylogenetic analysis, OsMAPK4 belongs to subgroup IV MAPK in plants. OsMAPK4 transcripts were expressed strongly in mature leaves and weakly in young leaves and panicles. The gene was also differentially expressed in roots at different developmental stages. In addition, the mRNA level of OsMAPK4 was up-regulated under sugar starvation, high salinity and cold treatments. These results suggest that this OsMAPK4 functions not only in developmental programs but also in stress-signaling pathways.
Department of Biology, National Cheng-Kung University, No. 1 University Road 701, Tainan, Taiwan.
Shin-Feng
SF
Fu
Wan-Chi
WC
Chou
Dinq-Ding
DD
Huang
Hao-Jen
HJ
Huang
D000595:Amino Acid Sequence; D002241:Carbohydrates / Q000494:pharmacology; D003080:Cold Temperature; D018076:DNA, Complementary / Q000737:chemistry / Q000235:genetics; D018507:Gene Expression Regulation, Developmental / Q000187:drug effects; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects; D018506:Gene Expression Regulation, Plant / Q000187:drug effects / Q000235:genetics; D020928:Mitogen-Activated Protein Kinases / Q000235:genetics*; D008969:Molecular Sequence Data; D012275:Oryza / Q000201:enzymology / Q000235:genetics* / Q000254:growth & development; D010802:Phylogeny; D010940:Plant Proteins / Q000235:genetics; D012333:RNA, Messenger / Q000187:drug effects / Q000235:genetics / Q000378:metabolism; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D012965:Sodium Chloride / Q000494:pharmacology; D014158:Transcription, Genetic
D002241:Carbohydrates; D018076:DNA, Complementary; D010940:Plant Proteins; D012333:RNA, Messenger; D012965:Sodium Chloride; D020928:Mitogen-Activated Protein Kinases