Inueflnces of Exogenous Nitric Oxide Donor SNP on Seed Germination and Seedling Resistance Physiology in Festuca arundinacea under PEG Simulated Drought Stress

The seed germination,seedling growth and stress resistance of Festuca arundinacea were discussed in this paper as the different treatment(CK,10% PEG,0.1 mmol/L SNP+10% PEG,1.0 mmol/L SNP+10% PEG) were carried out in the experiments.The results showed that Festuca arundinacea seed germination rate,germinating energy,germination index,vigor index and seedling chlorophyll content and catalase(CAT) activities were downward trend,but the content of malondialdehyde(MDA),proline,soluble sugar,superoxide anion(O-·2) and hydrogen peroxide(H2O2) of seedling leaves increased,the activities of superoxide dismutase(SOD) and peroxidase(POD) increased firstly and then decreased under the simulated drought stress.The results also showed that the growth and development of Festuca arundinacea were inhibited significantly under the simulated drought stress and the seedling suffered from drought stress.As being treated with the exogenous NO donor SNP,the Festuca arundinacea seed germination rate,germinating energy,germination index,vigor index,and the leaves′ content of chlorophyll,proline and soluble sugar,the activities of SOD,POD and CAT increased,the content of MDA,O-·2and H2O2 declined.The results also showed that the growth and development of Festuca arundinacea were promoted,injury mitigated when the seedlings enduring the PEG simulated drought stress being treated with the exogenous NO donor SNP.So it can be concluded that when the seedlings being treated with exogenous NO donor SNP,the protective effect is significant when the seedlings suffered from the 10% PEG solution simulated drought stress.