Physiological Characteristics Effect Of Different Genetype Maize Inbred Line Under Drought Stress

Drought is an important environmental factor affecting the stability of maize yield overthe world corn,so screening of drought resistant in maize is very important. Drought resistantmaize inbred lines is the foundation of drought-resistance maize hybrid breeding, Thecorrect selection of drought resistance of maize inbred lines and physiological characteristicsof drought-resistent can provide a theoretical basis. In this study, ten maize inbred lines asmaterials, we investigated their agronomic and yield traits, also biological charateristicsunder the normal water supply and drought stress two treatments. We draw the followingconclusions by further analysis of the physiological characteristics:1. We got a stronger drought resistance inbreds Zheng58and91227, the weakerdrought resistance inbreds K12, Screening of comprehensive evaluation for ten maize inbredlines, by the basis for the evaluation on drought factor and drought index, combined with astrong correlation comprehensive evaluation agronomic traits and physiological traits.2. By studying the effects of PSⅡunder drought stress on corn, we discovered: whetherZheng58and91227of drought resistant or K12of drought weaker, its donor side of PSⅡ(Vk) and acceptor side (Vj) will have a very significant rise,and the magnitude of increase isgreater than the acceptor side for side. This shows that the donor side affects activity of PSⅡ.However, compared with K12, the changes of Zheng58and91227is very small, itindicated that the electron donating ability of PSⅡsides of Zheng58and91227was strongerthan K12. We believe that the donor side of PSⅡdecline eventually led to a decline in therate of electron transfer, leading to the overall stability of PSⅡdecreased, resulting in areduced photosynthetic rate. This may be an important reason for non-drought K12.3. Through research of drought stress on antioxidant enzymes in maize and osmolytesimpact we found: protective enzyme、MDA、Pro levels of zheng58、91227andK12wereincreased and increase of Zheng58and91227is much larger than K12.Ability to removereactive oxygen species of antioxidant enzymes (SOD, POD, CAT, APX) of Zheng58and91227was stronger than K12; extent of the damage to their membrane peroxidation were also less than K12; Their ability to increase the penetration of substances through theirosmotic adjustment is stronger than K12. This may also be an important reason for droughtresistence of zheng58and91227stronger than K12.