硝态氮的吸收转运是氮营养调控的重要过程。课题前期研究发现作物生产上广泛应用的防倒伏调节剂的主要有效成分乙烯利降低玉米氮吸收量，但是外源乙烯如何调控玉米硝态氮吸收转运的分子生理机制尚未见报道。本项目拟在温室和大田条件下，利用15N标记定量分析外源乙烯对玉米硝态氮吸收转运能力的影响；并阐明外源乙烯诱导的根系生长和硝态氮转运蛋白基因对玉米硝态氮吸收转运的调控机理。研究将揭示氮营养调控机制，为提高作物氮吸收利用效率提供理论依据，也为创制新型防倒伏复合调节剂提供理论基础。

Nitrate nitrogen uptake and transport are the important processes of nitrogen nutrient regulation. We previously found that ethephon (the main effective components of lodging resistant regulator widely used in crop production) decreased nitrogen uptake. However, molecular and physiological mechanism of exogenous ethylene regulated nitrate nitrogen uptake and transport of maize have not yet been reported. This research will be conducted under greenhouse and field condition, to quantitative analyze the effect of exogenous ethylene on maize nitrate nitrogen uptake and transport capacity using 15N labeling; to illuminate the mechanism of root growth and nitrate transporter gene regulated maize nitrate nitrogen uptake and transport induced by exogenous ethylene. These results will reveal the regulation mechanism of nitrogen nutrient, give theoretical basic for improving crop nitrogen uptake and use efficiency, and provide theoretical foundation for the creation of a new lodging resistant composite regulator.