Stress tolerance and / or grasses with improved productivity, and its production method

The present invention, various rice stress tolerance is improved and their progeny which stably retains the polyamine metabolism-related enzyme gene; a method for producing a callus of the plant; production methods of the plant. Further, the present invention, the present invention is rice and their progeny productivity or traits are improved to stably hold the polyamine metabolism-related enzyme gene; a method for producing a callus of the plant; production methods of the plant.