Mitigating effects of exogenous NO and SA on salt stress in maize seedlings
[Objective]To investigate the regulatory effects of exogenous nitric oxide(NO)and salicylic acid(SA)on the phenotype and antioxidant properties of maize seedlings under salt stress.[Method]In this study,the salt-sensitive inbred line PH4CV was used as the test material.At the seedling stage,180 mmol/L NaCl solution was used as the stress condition.Two controls,distilled water(CK+)and salt stress(CK-),were established.[Result]Compared with salt treatment,root application of 1/2×(0.05 mmol/L SNP+0.5 mmol/L SA)significantly increased the indices of PH4CV(P<0.05):seedling length,root length,above-ground fresh weight,below-ground fresh weight and root number increased by 64.83%,73.00%,73.81%,71.43% and 58.63%,respectively.The activities of CAT,POD and SOD in-creased by 69.60%,22.40% and 32.90% respectively.However,seedling length,root length,aboveg-round fresh weight,underground fresh weight and root number of 0.05 mmol/L SNP increased by 61.62%,72.64%,67.65%,62.50% and 58.63%,respectively,and the activities of CAT,POD and SOD increased by 32.14%,20.47% and 5.69%,respectively.Seedling length,root length,aboveground fresh weight,un-derground fresh weight and root number at 0.5 0.5 mmol/L SA increased by 63.27%,68.68%,70.67%,68.97% and 57.13% respectively,while CAT,POD and SOD activities increased by 44.93%,3.76% and 21.76% respectively.[Conclusion]Both single and combined application of exogenous SNP and SA at op-timal concentrations could alleviate salt stress on PH4CV,and the combined treatment had a better effect,indicating that the combined application of SA and SNP had a synergistic effect in improving salt resistance of maize seedlings.
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