Abstract
Zinc (Zn (II) HEDTA) was used to determine their effect on salt-induced damages in maize plants. The aim of this study was to investigate the antioxidant capacity and the levels of enhanced total phenolic (TPC), total flavonoid (TFC) contents and their antioxidant activity in leaves of two maize cultivars Single cross 10 (SC10) and Single cross 162 (SC162) grown in two levels of salinity 0.00 and 100 mmol in response to 20 μmol Zn (II) HEDTA foliar spray treatments. Significant differences (P ≤ 0.05) in amounts of TPC ranged from (2.55 to 4.62 mg/gdw as Gallic) in Single cross 10 (SC10) and from (2.53 to 4.38 mg/gdw as Gallic) in Single cross 162 (SC162), TFC (ranged 1.53 to 2.41 mg/gdw as qurestien) in Single cross 10 (SC10) and from (1.28 to 2.41 mg/gdw as qurestien) in Single cross 162 (SC162) among all treated plants were observed. The levels of their compounds increase related to foliar spraying of Zn (II) HEDTA. A significant positive correlation between TPC, TFC and DPPH scavenging activity and iron chelating activity was observed which shows that phenolic compounds were involved in the mechanism of salt tolerance of the two cultivars by showing enhanced antioxidant activity which resulted in reduced membrane damage and hence improved growth. According to the results obtained, the adverse effects of salt stress on maize plants can partly be alleviated with application of Zn (II)-HEDTA chelates. It is concluded that the application of Zn (II) HEDTA to maize plants grown in salt conditions leads to the increase of antioxidant compounds and maize tolerance.
Highlights
Salinity is one of the most important abiotic stresses affecting yield and quality of agricultural plants worldwide
A lot of research is being conducted to elucidate the role of various antioxidant metabolites in plant stress tolerance, antioxidant properties of phenolic compounds among other metabolites have been studied to a great extent [5] [6]
Effect of Salinity on (TPC) and (TFC) and Their Antioxidant Activities on Two Maize Cultivars Spraying with Zn (II) HEDTA
Summary
Salinity is one of the most important abiotic stresses affecting yield and quality of agricultural plants worldwide. A lot of research is being conducted to elucidate the role of various antioxidant metabolites in plant stress tolerance, antioxidant properties of phenolic compounds among other metabolites have been studied to a great extent [5] [6]. Higher activity of phenolics under stress conditions could be due to the greater H+-donating ability and radical stabilization than a variety of other antioxidant metabolites [7]. Maize (Zea mays L.) is the third most important cereal crop after wheat and rice and is grown all over the world in a wide range of climatic condition. Maize (Zea mays L.) is moderately sensitive to salinity and considered as salt sensitive of cereals [8]. Because of great sensitivity of this crop, improvement for salt tolerance would be of considerable value
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