Abstract: This invention relates generally to plant cells and/or plants with increased tolerance to environmental stress and/or increased yield as compared to a corresponding, e.g. non-transformed, wild type plant cell by increasing or generating one or more activities of polypeptides associated with abiotic stress responses and abiotic stress tolerance in plants. In particular, this invention relates to plant cells and/or plants tailored to grow under conditions of environmental stress, and/or to plant cells and/or plant showing increased yield under environmental stress conditions. The invention also deals with methods of producing and screening for and breeding such plant cells and/or plants.