Proline is thought to be a compatible osmolyte that can help crops to tolerate osmotic stress. The process of proline synthesis and decomposition is regulated by many factors. The main biological function of proline accumulation is assembled with the osmotic regulation of plant cells, the regulation of nitrogen and energy matebolism and the protection of cell membrane system. There is some differences in proline accumulation according to the variation of crops. The relationship between proline accumulation ...