Results showed that under a water stress condition, NR activity was significantly reduced while concentrations of proline, glycine betain and soluble protein were increased.

• 2品种苗期对水分胁迫响应较弱，脯氨酸、甜菜碱和可溶性蛋白质含量低；拔节和抽雄期响应强烈，这些化合物含量增高，其中甜菜碱含量达到高峰时间比脯氨酸晚。