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With extensive promotion and productive \When seedlings sampled once every three days, a total of four times; reproductive stage sampled once each period, a total of five times. Determination of RWC, MDA, conductivity, proline and soluble protein, soluble sugar content, SOD, POD and other activities of antioxidant enzymes, chlorophyll content, net photosynthetic rate. Study of rare earth fertilizer on fields planted with wheat under drought stress leaf antioxidant enzyme system, and with the control of exogenous NO drought substances. In order to be able to rare earth fertilizer and exogenous NO donor sodium nitroprusside drought provides intuitive data. Experimental results show that: PEG simulated drought stress, the wheat seedlings malondialdehyde and superoxide anion release rate over an extended period of drought stress gradually increases. Wheat seedlings rapid accumulation of reactive oxygen species, and thus start their own resilience systems such as POD, CAT activity increased to clear the body of excess reactive oxygen species, proline and soluble protein content increases remained relatively stable osmotic potential. But their resilience system has a certain threshold, after spraying Lanthanum, antioxidant enzymes POD, CAT activity was significantly increased, proline and soluble protein content increased significantly. Lanthanum wheat under drought stress by increasing antioxidant enzyme activity in leaves, strengthen scavenging reactive oxygen capacity, increasing membrane stability, maintenance of cell osmotic potential, reducing the role of lipid peroxidation, thus easing the drought on wheat seedling damage, enhance its drought resistance. When soil moisture content is 40% under drought stress, lipid peroxidation of wheat increased beyond the level of their own resilience. SNP can reduce wheat caused by drought stress increased MDA content, membrane permeability increased, improving drought-induced reduction in leaf relative water content, membrane lipid peroxidation ease; also enables osmolytes proline and soluble sugar content are close to normal levels, improve wheat under drought stress osmotic adjustment ability; by increasing the activity of antioxidant enzymes to improve the drought resistance of wheat; and by inducing the synthesis of chlorophyll increased net photosynthetic rate, and further improve crop drought resistance. Lipid peroxidation of wheat increased beyond the level of their own resilience. Rare fertilizer reduces wheat caused by drought stress increased MDA content, membrane permeability increased, improving drought-induced reduction in leaf relative water content, ease membrane lipid peroxidation; also enables osmolytes proline and soluble protein concentrations are close to normal levels, improve wheat under drought stress osmotic adjustment ability; wheat leaves by increasing the activity of antioxidant enzymes to improve the drought resistance of wheat and water retention capacity; and by inducing the synthesis of chlorophyll increased net photosynthetic rate to further improve crop drought resistance.
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