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Enhanced effects of exogenous nitric oxide on salt tolerance of Avena nuda L. seedlings.

LIU Jian-xin**, WANG Jin-cheng, WANG Rui-juan, JIA Hai-yan   

  1. (College of Life Science and Technology, Longdong University, Provincial Key Laboratory for Protection and Utilization of Longdong Bioresources in Gansu Province, Qingyang 745000, Gansu, China)
  • Online:2015-04-10 Published:2015-04-10

Abstract: A naked oat (Avena nuda L.) cultivar, ‘Dingyou No. 6’ was selected as material to investigate the effects of exogenous NO donor, sodium nitroprusside (SNP), on the growth, active oxygen metabolism and osmotic substances accumulation in leaves of naked oat seedlings under 100 mmol·L-1 NaCl using nutrient solution cultivation. The results showed that 5 μmol·L-1 SNP significantly alleviated the inhibitory effect of salt stress on the growth of naked oat seedlings. Besides, exogenous SNP not only significantly increased the activities of superoxide dismutase, peroxidase, ascorbate peroxidase, but also increased the contents of glutathione, ascorbic acid, soluble sugar, soluble protein and proline as well as the K+/Na+ ratio. Furthermore, SNP significantly decreased the contents of malondialdehyde, hydrogen peroxide, superoxide anion and free amino acid and catalase (CAT) activity in leaves of naked oat seedlings under NaCl stress. Exogenous NO could alleviate the oxidative damage and growth inhibition of naked oat seedlings under salt stress via improving antioxidant ability and osmotica accumulation as well as keeping balance between K+ and Na+ under NaCl stress, and consequently improve the salt tolerance of plants.

Key words: sewage sludge, biomass, heavy metal, Neolamarckia cadamba