PROBLEM TO BE SOLVED: To obtain a new gene and its promoter in which expression is strongly induced from a cultured cell derived from an Ipomoea batatas plant body under the condition of environmental stress and which encode an Ipomoea batatas peroxidase (POD). SOLUTION: The DNA and the promoter in which the expression is strongly induced from the cultured cell derived from the Ipomoea batatas plant body under the environmental stress condition and which encode the Ipomoea batatas peroxidase are provided. The whole or a part of the promoter of the peroxidase gene is used in development of a transformant of cells, plant bodies, microorganisms and bacteria, and also for a resistant organism having resistance against the environmental stress and a transformed organism capable of producing a large amount of a useful component.
