Abstract
Wheat plants ( Triticum aestivum L., cv. Giza 168) irrigated with either 10 or 20% of Seawater (SW) were treated with aqueous extracts of green microalgae Scenedesmus obliquus and blue green algae Spirulina platensis (AESO and AESP 20 g (dry weight)/L) in order to increase wheat salt tolerance. Treated plants showed higher ability to tolerate salt stress (10 o r 20% SW) by significant (p>0.5%) increasing of photosynthetic pigments (chlorophyll: Chlorophyll t otal, chlorophyll a and b types) and antioxidant lo wmolecular compounds (glutathione and carotenoids) contents. The increase of these contents was associa ted with increasing activities of antioxidant enzyme sy stems Superoxide Dismutase (SOD), Ascorbate Peroxidase (APX), Catalase (CAT) and total Peroxidase (POD). In addition, this observation was significantly corr elated with decreasing of lipid peroxide products (TBARs) and sodium ions concentrations. However, wheat plant exposed to salt stress showed significant changes i n all growth parameter and antioxidant low-molecular compounds and antioxidant enzyme activities compared with that in plants irrigated with regular water (tap water). In addition, plants treated with oxalic aci d as bioregulator agent implied a moderate changes on growth parameters, antioxidant capacity includes non-enzyme and enzymatic systems compared with that in wheat plants treated with algae extracts. This study indi cates that the algae extracts could be used as a promising plant growth enhancer for treating wheat plants irr igated with brackish water.
Highlights
The Reactive Oxygen Species (ROS) comprises both free radical (O-2, superoxide radicals; OH_, hydroxyl radical; HO2_, perhydroxy radical ROO2-and alkoxy radicals RO_) and non-radical forms (H2O2, hydrogen peroxide and 1O2, singlet oxygen) are produced in plants under normal growth conditions and their concentration deficiency, or salt stress, can induce increase the production of ROS (Karpinski et al, 2003; Laloi et al, 2004; Gill and Tuteja, 2010)
Plants treated with oxalic acid as bioregulator agent implied a moderate changes on growth parameters, antioxidant capacity includes non-enzyme and enzymatic systems compared with that in wheat plants treated with algae extracts
The results revealed that the both algal cells showed significant increase in antioxidant molecule when compared with algae grow in medium containing optimum nitrogen levels
Summary
The Reactive Oxygen Species (ROS) comprises both free radical (O-2, superoxide radicals; OH_, hydroxyl radical; HO2_, perhydroxy radical ROO2-and alkoxy radicals RO_) and non-radical forms (H2O2, hydrogen peroxide and 1O2, singlet oxygen) are produced in plants under normal growth conditions and their concentration deficiency, or salt stress, can induce increase the production of ROS (Karpinski et al, 2003; Laloi et al, 2004; Gill and Tuteja, 2010). Abd El Baky et al / American Journal of Agricultural and Biological Sciences 9 (2): 127-137, 2014 condition; ROS are generated through pathways such as photorespiration, mitochondrial respiration and from the photosynthetic apparatus (Pei et al, 2000). Under these conditions, the cellular electron transport within the different subcellular compartments is impairs and lead to generation of ROS compounds (Ali and Alqurainy, 2006). Many studies indicated that some natural compounds might play an important role in enhancing plant tolerance to some abiotic stresses such as salt, drought and extreme temperatures (Ashraf, 2010; Abd El Baky et al, 2010). This study was aimed to understand the impact of treated wheat plants irrigated with 10 and 20% seawater with algal extracts as bioregulator to enhance salt tolerance
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