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以内单314为试验材料,在行间覆膜(SPF)、行上覆膜(UPF)及不覆膜(NPF)3种处理下,对超高产春玉米花粒期不同层位叶片的保护酶活性、光合特性及产量进行研究。结果表明,超高产春玉米花粒期不同层位叶片POD活性表现为下位叶>穗位叶>上位叶;CAT、SOD活性表现为上位叶>穗位叶>下位叶。灌浆期玉米不同层位叶片净光合速率、气孔导度、蒸腾速率变化趋势表现为穗位叶>上位叶>下位叶;乳熟期不同层位叶片净光合速率、气孔导度、蒸腾速率表现为上位叶>穗位叶>下位叶。表明在玉米花粒期,行间覆膜处理可以提高玉米上位叶及穗位叶的净光合速率、POD活性、CAT活性及SOD活性,减小气孔导度,降低叶片蒸腾速率,延缓叶片衰老,维持花粒期生理功能,保证子粒充分灌浆,提高千粒重,进而提高产量,实现超高产。
With single 314 as test material, under the treatments of interplanting membrane (SPF), laminating membrane (UPF) and non-laminating membrane (NPF), the protective enzymes Activity, photosynthetic characteristics and yield were studied. The results showed that the activities of POD in different layers of super high-yield spring maize were lower leaves> ear leaves> upper leaves; CAT and SOD activities were higher leaves> ear leaves> lower leaves. The trend of net photosynthetic rate, stomatal conductance and transpiration rate of leaves at different layers in the filling period was the spike leaf> the upper leaf> the lower leaf. The net photosynthetic rate, stomatal conductance and transpiration rate of leaves in different layers of milky milky stage were Upper leaves> spike leaves> lower leaves. The results showed that the net photosynthetic rate, POD activity, CAT activity and SOD activity of upper leaves and ear leaves of corn could be increased by film mulching at the flowering stage of corn, and the stomatal conductance, the transpiration rate of leaves and the senescence of leaves were retarded, To maintain the physiological function of anthesis, to ensure full grain filling, improve 1000-grain weight, thereby increasing yield and achieve high yield.