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Effect of PASP-KT-NAA on Leaf Senescence and Grain Filling Rate during the Grain-Filling Period in Different Temperature Zones Effects of PASP-KT-NAA on Photosynthesis and Antioxidant Enzyme Activities of Maize Seedlings under Low Temperature Stress Effect of Plant Growth Regulators on Key Enzymes in Sucrose Metabolism of Ear Leaf and Grain at Filling Stage of Spring Maize