Effect of exogenously applied nitric oxide (NO) and thiourea (TU) in combination was examined in maize plants under saline stress. Seedlings of two maize cultivars (DK 5783 and Apex 836) were grown in pots containing soil salinized with 0 or 100 mM NaCl dissolved in irrigation water. Two levels of NO + TU (3 + 400 or 6 + 500 mg/L) were applied as presowing seed treatment or through leaves of 10-day old maize seedlings. Saline stress significantly suppressed plant fresh biomass, leaf water potential and chlorophyll content, but increased electrolyte leakage in both cultivars. However, these reductions were higher in Apex 836 than those in Dk 5783. Both treatments of combined NO and TU as seed soaking or foliar application were effective in mitigating the adverse effects of saline stress on shoot growth. Seed treatments of both levels of combined NO and TU were more effective in terms of improvement in fresh weights of DK 5783 than foliar treatments. Leaf Na+ contents increased whereas those of N and P decreased in maize plants under saline regime. Application of Both modes of treatment of combined NO and TU increased the contents of N and P, but decreased that NO and TU through both modes increased Na+ in salt stressed maize plants. The results of the present study indicate that application of NO and TU compounds in combination alleviated the detrimental effects of salinity and increased resistance to salinity in the maize plants by improving plant growth
Effect of exogenously applied nitric oxide (NO) and thiourea (TU) in combination was examined in maize plants under saline stress. Seedlings of two maize cultivars (DK 5783 and Apex 836) were grown in pots containing soil salinized with 0 or 100 mM NaCl dissolved in irrigation water. Two levels of NO + TU (3 + 400 or 6 + 500 mg/L) were applied as presowing seed treatment or through leaves of 10-day old maize seedlings. Saline stress significantly suppressed plant fresh biomass, leaf water potential and chlorophyll content, but increased electrolyte leakage in both cultivars. However, these reductions were higher in Apex 836 than those in Dk 5783. Both treatments of combined NO and TU as seed soaking or foliar application were effective in mitigating the adverse effects of saline stress on shoot growth. Seed treatments of both levels of combined NO and TU were more effective in terms of improvement in fresh weights of DK 5783 than foliar treatments. Leaf Na+ contents increased whereas those of N and P decreased in maize plants under saline regime. Application of Both modes of treatment of combined NO and TU increased the contents of N and P, but decreased that NO and TU through both modes increased Na+ in salt stressed maize plants. The results of the present study indicate that application of NO and TU compounds in combination alleviated the detrimental effects of salinity and increased resistance to salinity in the maize plants by improving plant growth
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Agastian, P., Kingsley, S.J., Vivekanandan, M., 2000. Effect of salinity on photosynthesis and biochemical characteristics in mulberry genotypes. Photosynthetica 38, 287–290.
Arshadullah, M., Rasheed, M., Zaidi, S.A.R., 2011. Salt tolerance of different rice cultivars for their salt tolerance under salt-affected soils. Int. Res. J. Agri. Sci. Soil Sci. 1, 183- 184
Bashir, F., Ali, M., Hussain, K., Majeed, A., Nawaz, K,. 2011. Morphological variations in sorghum (Sorghum bicolor L.) under different levels of Na2SO4 salinity. Bot. Res. Int. 4, 1-3
Beligni, M.V., Lamattina, L., 2001. Nitric oxide: A non- traditional regulator of plant growth. Trends Plant Sci. 6, 508–509.
Crawford, N.M., Guo, F.Q., 2005. New insights into nitric oxide metabolism and regulatory functions. Trends Plant Sci. 10, 195–200.
Delledonne, M., 2005. NO news is good news for plants, Curr. Opin. Plant Biol. 8, 1–7
Beligni, M.V., Lamattina, L., 2000. Nitric oxide stimulates seed germination and de-etiolation, and inhibits hypocotyl elongation, three light-inducible responses in plants. Planta 210,215–221.
Chapman, H.D., Pratt, P.F., 1982. Methods of Plant Analysis. I. Methods of analysis for soils, plants and water. Riverside, CA: Chapman Publishers.
Chen, C.T., Li, C.C., Kao, C.H., 1991. Senescence of rice leaves XXXI. Changes of chlorophyll, protein and polyamine contents and ethylene production during senescence of a chlorophyll-deficient mutant. J. Plant Growth Reg. 10, 201- 205
Delledonne, M., 2005. NO news is good news for plants. Curr. Opin. Plant Biol. 8, 1–7.
Dhindsa, R.S., Plumb-Dhindsa, P., Thorpe, T.A., 1981. Leaf senescence correlated with increased levels of membrane permeability and lipid peroxidation, and decreased levels of superoxide dismutase and catalase. J. Exp. Bot. 32, 93-101
Dionisio-Sese, M.L., Tobita, S., 1998. Antioxidant responses of rice seedlings to salinity stress. Plant Sci. 135, 1- 9
Durner, J., Klessig, D.F., 1999. Nitric oxide as a signal in plants, Curr. Opin. Plant Biol. 2, 369–374
Farooq, M., Basra, S.M.A., Wahid, A., Rehman, H., 2009. Exogenously applied nitric oxide enhances the drought tolerance in fine grain aromatic rice (Oryza sativa L.). J. Agron. Crop Sci. 14, 220-225
Gadallah, M.A.A., 1999. Effects of proline and glycinebetaine on Vicia faba response to salt stress. Biol. Plant. 42, 249–257.
Garc´ıa-Mata, C., Lamattina, L., 2001. Nitric oxide induces stomatal closure and enhances the adaptive plant responses against drought stress. Plant Physiol. 126, 1196– 1204
Hernandez, J.A., Olmos, E., Corpas, F.J., Sevilla, F., del Rio, L.A., 1995. Salt-induced oxidative stress in chloroplasts of pea plants. Plant Sci. 105, 151–167.
Hu, X.S., Neill, J., Tang, Z., Cai, W., 2005. Nitric oxide mediates gravitropic bending in soybean roots. Plant Physiol. 137, 663-670.
Hussain, K., Ashraf, M., Ashraf, M.Y., 2008. Relationship between growth and ion relation in pearl millet (Pennisetum glaucum L.) at different growth stages under salt stress. Afr. J. Plant Sci. 2, 23-27
Kausar F., Shahbaz, M. 2013. Interactive effect of foliar application of nitric oxide and salinity on wheat (Triticum aestivum). Pak. J. Bot. 45, 67-73
Kaya, C., Kirnak, H., Higgs, D., 2001. Enhancement of growth and normal growth parameters by foliar application of potassium and phosphorus in tomato cultivars grown at high (NaCl) salinity. J. Plant Nutr. 24, 357-367
Munns, R, Tester, M., 2008. Mechanisms of salinity
tolerance. Annu. Rev. Plant Biol. 59, 651-681
Naidu, B.P., Williams, R., 2004. Seed treatment and foliar application of osmoprotectants to increase crop establishment and cold tolerance at flowering in rice. A Report of the Rural Industries Research and Development Corporation Project No. CST-2A. CSIRO Tropical Agriculture, Brisbane
Pagnussat, G.C., Lanteri, M.L., Lamattina, L., 2003. Nitric oxide and cyclic GMP are messengers in the indole acetic acid-induced adventitious rooting process. Plant Physiol. 132, 1241–1248.
Perveen, S., Shahbaz, M., Ashraf, M., 2011. Modulation in activities of antioxidant enzymes in salt stressed and nonstressed wheat (Tritcum aestivum L.) plants raised from seed treated with tricontanol. Pak. J. Bot. 43, 2463-2468.
Perveen, S., Shahbaz, M., Ashraf, M., 2012. Changes in mineral composition, uptake and use efficiency of salt stressed wheat (Triticum aestivum L.) plants raised from seed treated with triacontanol. Pak. J. Bot. 44, 27-35
Quan, R., Shang, M., Zhang, H., Zhao, Y., Zhang, J., 2004. Engineering of enhanced glycine betaine synthesis improves drought tolerance in maize. Plant Biotech J 2, 477–486
Sabater, B., Rodriguez, M.T., 1978. Control of chlorophyll degradation in detached leaves of barley and oat through effect of kinetin on chlorophyllase. Physiol. Plant. 43, 274-276.
Sahu, M.P., Singh, D., 1995. Role of thiourea in improving productivity of wheat (Triticum aestivum L.). Plant Growth Regul. 14, 169-173
Sahu, M.P., Solanki, N.S., Dashora, L.N., 1993. Effects of thiourea, thiamine and ascorbic acid on growth and yield of maize (Zea mays L.). J. Agron. Crop Sci. 171, 65-69
Sahu, M.P., Solanki, N.S., 1991. Role of sulphydryl compounds in improving dry matter partitioning and grain production of maize (Zea mays L.). J. Agron. Crop Sci. 167, 356-359.
Shi, S.Y., Wang, G., Wang, Y.D., Zhang, L.A., Zhang, L.X., 2005. Protective effect of nitric oxide against oxidative stress under ultraviolet-B radiation, Nitric Oxide, 13, 1–9.
Srivastava, A.K., Ramaswamy, N.K., Suprasanna, P., D'Souza, S. F., 2010. Genome-wide analysis of thiourea- modulated salinity stress responsive transcripts in seeds of Brassica juncea: identification of signalling and effector components of stress tolerance. Ann. Bot.106, 663-674
Strain, H.H., Svec, W.A., 1966. In: The chlorophylls, Vernon, L.P. and Seely, S.R. (eds), Acad. Press, New York. pp. 21.
Wu, X., Zhu, W., Zhang, H., Ding, H., Zhang, H.J., 2011. Exogenous nitric oxide protects against salt-induced oxidative stress in the leaves from two genotypes of tomato (Lycopersicon esculentum Mill.). Acta Physiol. Plant. 33, 1199-1209.
Yasseen, B.T., 1983. An analysis of the effects of salinity on leaf growth in Mexican wheats. UK, The University of Leeds. Ph. D. thesis.
Zhang, Y.Y., Liu, J., Liu, Y.L., 2004. Nitric oxide alleviates growth inhibition of maize seedlings under salt stress. J.Plant Physiol. Mol. Biol. 30, 455-459