Transcription factor polynucleotides and polypeptides incorporated into nucleic acid constructs, including expression vectors, have been introduced into plants and were ectopically expressed. Transgenic plants transformed with many of these constructs have been shown to have increased tolerance to an abiotic stress (in some cases, to more than one abiotic stress), increased growth, and/or increased biomass. The abiotic stress may include, for example, salt, hyperosmotic stress, water deficit, heat, cold, drought, and/or low nutrient conditions.