This invention provides a stress tolerant transgenic plant with the utilization of a signal transduction factor located upstream of the gene group associated with environmental responses. This invention provides a gene encoding the following protein (a) or (b) and a stress tolerant transgenic plant to which such gene has been introduced: (a) a protein consisting of the amino acid sequence as shown in SEQ ID NO: 2 in the Sequence Listing; or (b) a protein consisting of an amino acid sequence derived from the amino acid sequence as shown in SEQ ID NO: 2 in the Sequence Listing by deletion. substitution, or addition of one or several amino acid residues and having activity of inducing expression of stress responsive transcription factors and activity of protein kinase.