A transgenic plant transformed by a Vesicle Trafficking Stress-Related Polypeptide (VTSRP) coding nucleic acid, wherein expression of the nucleic acid sequence in the plant results in the plant's increased growth and/or increased tolerance to environmental stress as compared to a wild type variety of the plant. Also provided are agricultural products, including seeds, produced by the transgenic plants. Also provided are isolated VTSRPs, and isolated nucleic acid coding VTSRPs and vectors and host cells containing the latter.