Salinity is a major abiotic stress and saline-alkali soil accounts for approximately 7%of the world's total land area.The reduction of crop production caused by salt stress losses billions of dollar every year.The maize(Zea mays L.)is a high yield crop,and it is not only an important crop but also a crucial material of industry.Plants have two discrete mechanisms response to salt stress.One of them is the biosynthesis of compatible solutes,such as the proline and mannitol.These solutes can keep a stable cel...