| We use wheat "zhengmai 5" as experimental material and water culture and pot were two ways of culture.In seeding and different reproductive stage,we sprayed rare earth fertilizer and SNP after drought Stress on wheat. We collected sample every 3 days,4 times in seeding stage and every growing stage,5 times in reprod.By determination of leaf relative water content, MDA, electrical conductivity, research the effect of wheat,proline and soluble protein,soluble sugar,antioxidant enzymes system (SOD,POD,et al.), chlorophyll content, net photosynthetic rate.We researched rare earth fertilizer on wheat under drought stress in the field of Antioxidant Enzymes,and useexogenous NO as a control substance. rare earth fertilizer and exogenous NO donor sodium nitroprusside(SNP) could provide visual data of drought stress,and also provide the theoretical basis of the SNP and the rare earth fertilizer for agricultural extension.The result that the experimental material is "ningngmai 13", simulating drought stress with 15%PEG-6000 (polyethylene glycol), Study the effect of La (RE-La) on antioxidant ability of wheat seedlings under drought stress.,and explore the mechanisms of La to improve the drought resistance of wheat seedlings The results showed that RE-La could cause the wheet-seedling leaves to decrease the contents of lipid peroxidationMDA and the release rate of 02-,and accelerate differentially the activities of catalase (CAT) and peroxidase (POD),whereas increase their proline contents and soluble protein contents. The effects of RE-La could be rever sed when RE-La are added. It confirms that RE-La may effcetively enhance resistance against drought stress through raising anti-oxidative capability and improveing the oxidation resistance of wheet seedling. Under the drought stress by 40% content of the soil water, we studied the effects of the rare-earth elements and exogenous nitric oxide (NO) for sodium nitroprusside (SNP) on the physiological and photosynthetic characteristics by three aspects :the membrane lipid peroxidation,the content of osmotic adjustment and the photosynthetic parameters. The results showed that:they can not only reduce the increase of the MDA content in wheat leaves and the membrane permeability caused by drought stress.but also ease reduction of leaf relative water content and peroxidation of membrane lipid, the contents of proline and soluble protein were close to normal levels.they increased the ability of osmotic adjustment under drought stress ahd finally induced synthesis of chlorophyll and the rate of net photosynthetic. |
