Abstract: Screening of drought resistant maize cultivars and drought resistance index,then,study on the physiological and biochemical of that,realize drought resistance and water saving of maize in arid and semi arid region finally is an important subject in high yield and efficiency of maize.Pot experiment was used to study in this paper,which selected the newly released cultivars of Liaoning province in recent years,morphological and photosynthesis physiological characteristics of maize were studied and analyzed under water stress at seedling stage,tasseling-silking and seed filling stage.The study found out the relationship of indexes of drought resistance between photosynthesis and yield.In the meantime,stronger drought resistance maize cultivars were also screened out.The results are as follows:heading to flowering period time of 58% cultivars was shortened by water stress at seedling stage.ASI of 83% cultivars was prolonged.However,ASI of Tieyan 120 was shorter than that of control.Compared with other cultivars,chlorophyll content of Tieyan 120 was higher than that of other cultivars at seedling stage.The correlation analysis showed that drought resistance index of photosynthesis was positively correlated to yield drought resistance index at grain filling water stress stage,drought resistance index of the transpiration rate and yield had a stronger correlation.Classification of yield drought resistance at different water stress period showed that Tieyan 120 and Tieyan 58 had an integrated stronger drought resistance.They can got a higher yield at seed maturity stage,whether encountered water stress at the seedling stage,tasseling-silking or filling stage.

Key words: Maize, Yield, Photosynthetic index, Photo-drought-resistance index, Drought resistance

CLC Number: 

• S513.01