Studies On Photosynthetic Characteristics And Yield Of Mize Population Structure

Through a field test, three super high yielding varieties and three common Maizevarieties were compared at different growth stages i.e. plant morphology, photosyntheticphysiological characteristics, leaf area index, canopy structure and yield factors. Analysis ofsuper yielding varieties of photosynthetic characteristics plant morphology and leaf lighttransmission provide a theoretical base for screening high yielding varieties of maize. Themain conclusions are as follows:1. The entire growth period of maize showed that Plant height, leaf area index andbiomass of super high yielding varieties Yuyu22, Xianyu335were significantly higher thanthe Xianyu696, Qin Long11, Xianyu335and Xianyu696at critical growth stages of maize(tasseling, grouting period).2. Different varieties throughout the growing period of maize showed a downward trend inphotosynthetic and transpiration rate, stomatal conductance after the first rise of CO2concentration between cells which increased the performance of the present decline. Yuyu22,and the first jade Xianyu335, Xianyu696have showed a distinct advantage.3. Chlorophyll content filling stage of different maize varieties showed significantdifferences, in which Yuyu22and the first696jade have significantly higher chlorophyllcontent than Qinlong11, Xundan20, Shaandan609. Compared to Shaandan609chlorophyllcontent were increased by30.1%,19.4%4. Regarding soluble sugar content of six varieties of maize leaf, Yuyu22, Xianyu335andfirst696jade were significantly higher than the other three varieties. At first the starchcontent increases and then gradually decreased, reaching the lowest value at maturity.5． Different varieties of maize showed obvious differences of light transmission at variousgrowth stages。The light transmission in Yuyu22, Xianyu335and Xianyu696jade wassignificantly higher than the other three varieties and between all varieties ear layertransmittance was not significant. The canopy temperature of different varieties at grain filling and dough stage showed significant differences. Qinlong11, Xundan20, Shaandan609canopy temperature was significantly higher than Yuyu22, Xianyu335Xianyu696.6. Super high yielding varieties Yuyu22, Xianyu335and Xianyu696jade production weresignificantly higher than Qinlong11, Xundan20, Shaandan609respectively. Compared toShaandan609production was improved by24.0%,19.8%,19.6%.