Effects of shading on endogenous hormones regulation in kernel development of summer maize in the field. Powdery Mildew Resistance and HMW-GS Composition Analysis of Novel Wheat-Agropyron cristatum Germplasm Possessing Large Kernel Number Effects of Enhanced UV-B Radiation on Pollen Anti-oxidative Capacity and Post-pollination Kernel Development of Maize Effects of Low-light Stress on Male and Female Flower Development and Pollination and Fructification Ability of Different Maize (Zea mays L.) Genotypes Effect of nitrogen supply on carbon-nitrogen metabolism and kernel set in summer maize