A new gene, the recombinant expression vector containing the gene, thepolypeptide encoded by the gene and the use thereof are provided. The saidgene caneffectively increase tolerance of plants and microbes to abiotic stresses,such asdrought, acid-alkaline, saline-alkaline and heat. The methods for producingtransgenicplants and microbes are also provided. The methods are simple and effective.Thetransgenic plants and microbes exhibit enhanced tolerance to environmentalstresses.