Effect of Post-drought Rewatering on Transpiration Efficiency of Various Maize Varieties

Three water level and two phases were set to research on the effects of post-drought rewatering on stomatal resistance,transpiration rate,photosynthesis rate,transpiration efficiency and growth of two maize varieties.The results showed that maize appeared more activity in water relation and photosynthesis after the post-drought rewatering,the stomatal resistance was significantly decreased,transpiration rate and photosynthesis rate were significantly increased to a higher level compared with the fully water supply treatment.There was variety's difference in the influence degree of stomatal resistance and transpiration rate after the post-drought rewatering,Jiudan 2 was easy recovered to the former level and the photosynthetic rate had a large increment.There were varieties and treatments differences in the influence degree of transpiration efficiency after the post-drought rewatering,the transpiration efficiency of Yuyu 22 was significantly increased and has significantly increment for Jiudan 2.There was more physiological activity for the rewatering sensitive varieties,it could be compensated by the higher growth rate and water use efficiency after post-drought rewatering.It could be said that selecting rewatering sensitive varieties can improve the maize water use efficiency and yield.