WRKY transcription factor polypeptide gene application vector and method thereof

The invention discloses separated polynucleotide and polypeptides, recombinant DNA vectors used for improving the drought tolerance of plants, plants or seeds containing the recombinant DNA vectors, and a method using the recombinant DNA vectors. The recombinant DNA vectors contain functional promoters in plants, and polynucleotide connected with the promoters, wherein the polynucleotide codes a transcription factor WRKY polypeptide.