Response of Germination and Physiological of Maize Aging Seeds under the Influence of Exogenous Nitric Oxide Donor SNP

The seeds from maize varieties Xianyu335 and Liangyu99 aged with high temperature and high hu-midity selected as experimental materials, through soaked in different concentrations of SNP of exogenous Nitric Ox-ide donor and then germinated. The germination character,vigor character and physiology response of germinatedseedlings about the aging seeds were studied. The results showed that, under the action of some SNP concentration,the viability, germination energy, germination percentage and vigor index of the two varieties were higher than thecheck, especially 1.50 mmol/L and 1.25 mmol/L(P0.05). The contents of SOD, POD and CAT were the highest atthe SNP concentration 1.25 mmol/L, the next was 1.00 mmol/L, and the content of proline and soluble sugar fromthe seedlings of the aging seeds were higher than the check but the content of MDA showed no significant influence(P≤0.05). Therefore the germination ability, vigor and physiology character were significantly improved and en-hanced under the SNP concentration 1.25 mmol/L.