Influence of exogenous nitric oxide on improving drought tolerance of seven hybrids and seven inbreds of maize
2009
Rashed, H.M. | Abou-Elalla, F.M.
Nitric oxide (NO) is an active molecule involved in the mediation of various biotic and abiotic stresses inducing physiological responses in the plants In the present study, the effect of sodium nitroprusside (SNP) presoaking, as a donor of NO, on the antioxidant system of seven inbreds and seven hybrids of maize under drought stress was examined compared with the control. The activities of some antioxidant enzymes [Glutathionc reductase (GR, EC1.6.4.2), Superoxide dismutasc (SOD, EC1.15.1.1), Glutathione peroxidase (GPx, EC 1.11.1.9) and Catalase (CAT, EC 1.11.1.6], were assayed. Also, the levels of ascorbate, endogenous nitric oxide, chlorophyll , osmolality contents were determined in the leaves of maize subjected to water deficit. Hybrid and inbred seeds were planted in three different locations (Beni Swief T1, EL-Behara T2, and Giza T3). The drought treatments were estimated as 100, 80, and 65% of the field capacity and after 10, 14 and 18 days of drought stress in all locations. The results showed that although SNP induced increases in GR GPX and CAT activities in drought-stressed leaves of maize, while SOD activity remained unchanged (14 and 18 DAS). The levels of osmolality and chlorophyll remained unchanged, while the levels of total ascorbate, and nitric oxide were increased in SNP-treated leaves. The results also indicated that the levels of antioxidant enzyme activities , ascorbate and nitric oxide in SNP-treated depended on the NO content, cultivars and the cultivated locations. These might contribute to the differential prevention of oxidative damage in plants exposed to drought stress.
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