Study On Morphological Development And Yield And Water Utilization Of Maize Hybridized Combination Under Drought Stress

By pot experiments,two water treatments were designed,including normal water supply and middle drought stress under an anti-drought and rain-proof shelter,morphological characteristic,yield,drought resistance and water use efficiency(WUE) of 10 maize hybridized combination were studied.In periods,both the maize's saving water irrigation and the regulation of cultivation,method and theory basis were provided for choosing the plants with the stable yield, the high yield,the saving water's maize varieties under drought condition in our province,The result indicated that:1,performance of drought resistance of 411×18599,449×cross51,411×449 and S11×411 were well,and can maintain still high yield and the stable,subordinate function value of drought index of 411×18599 was 0.608,it was levelⅡResistant.While performance of drought resistance of 449×S11 and 18599×S11 were poor under drought stress.2,the grain output of 411×18599 was the highest,72.36/plant,while the grain output of cross51×18599 and S11×cross 51 were lower under normal water supply.The grain output of 411×18599 was the highest,65.06/plant,while the grain output of 18599×S11 and S11×cross 51 were lower under middle drought stress.3,the water consumption of 449×cross51 was the highest,28.22kg/plant under normal water supply.The water consumption of S11×411 was the highest,22.13kg/plant,while water consumption of 18599×S11 and 411×449 were lower under middle drought stress.4,the biological output of water use efficiency of 51×411 was the highest,9.19g/kg,the water use efficiency of the grain output of 18599×S11 was the highest,3.37g/kg under normal water supply,biological output of water use efficiency of 51×18599 was the highest,9.47g/kg;use efficiency of the grain output of 411×18599 and cross51×411 were high,3.50g/kg,3.41g/kg respectively under middle drought stress.5,the comprehensive analysis on biological output,the drought resistance,the water consumption and the water use efficiency,hybrid combination of 411×449 was the high yield,the strong drought resistance,the water consumption low and water use efficiency high,hybrid combination of 411×18599 was the high-yield,the strong drought resistance,the water consumption middle and water use efficiency high.The drought resistance,the output form and character of water utilization of 411×449 and 411×18599 may be studied deeply on further morphological development,physiological biochemistry characteristic,and heredity characteristic etc.6,the performance of compensation responses of plant high and leaf area were high after resumes the water supply,compensation responses of plant high of 449×cross51,S11×cross51, 411×449 and 18599×cross51 were more obvious.Compensation responses leaf area of 449×cross51 was obvious.7,step-by-step regressive analysis results showed that height of ear,length of barren,grain of row,100-grain weight,ear diameter,root/shoot ratio and the roots volume and water use efficiency of yield were close relativity,those were regarded as the appraisal evaluating index of maize hybrid combination water use efficiency of yield.