Impact of antioxidants supplementation on growth, yield and quality traits of canola (Brassica napus L.) under irrigation intervals in north nile delta of Egypt

Abstract

KEYWORDS Brassica napus Ascorbic acid Salicylic acid Irrigation Quality Yield ABSTRACTIn the present study, field experiments were carried out during the cropping seasons of 2012 and 2013 to examine the adverse effects of deficit irrigation on canola productivity and determining the role of ascorbic acid and salicylic acid (both of 200 ppm) in alleviating the adverse effects under deficit irrigation. Further, effects of these phytochemicals on canola growth, yield and quality characteristics were studied by imposing three irrigation intervals viz, 25 (I1), 35 (I2) and 45 (I3) days during both the growing seasons. The results of the study showed that the growth characteristics such as chlorophyll content and relative water content were decreased under the increase in irrigation intervals. Similarly, Yield and its components including plant height , silica number/plant, number of branches, seed number/ silica, seed yield/plant, seed yield / ha as well as, seed oil content of canola plant were decreased with increasing the intervals of irrigations. Application of both of phytochemical (salicylic acid and ascorbic acid) not only reversed the negative impact of water deficit conditions but also improved the growth and yield parameters of canola plant. However, the applications of antioxidants were more effective under the second irrigation intervals (I2) for both the cropping seasons. The maximum seed yield /ha, protein and oil yield was achieved by the applications of both antioxidants combined with irrigation every 35 days. From results of this study, it can be conclude that application of antioxidants could mitigate the harmful effects of deficit irrigation of canola. Accordingly, antioxidants supplementation could enhance the growth, yield and quality traits of canola under the increase of irrigation intervals in North Nile Delta.

Drought and salinity stress management for higher and sustainable canola (Brassica napus L.) production: a critical review

“…In canola, water stress significantly decreased chl (a+b) content in the vegetative, flowering and 50% pod-formation stages (Sharma et al, 1992). Water deficit significantly reduced chl content and RWC leaf by about 25-30% (EL Sabagh et al, 2017). Reduced leaf chl content in response to water stress is caused by ROS production, which damages the chloroplasts (Gill and Tuteja, 2010).…”

“…Hydroponics combined with the addition of AsA can improve the physiology of salt-stressed canola (Bybordi, 2012). The foliar application of antioxidants (AsA or SA, at 200 mg l -1 each) under various irrigation intervals impacted canola productivity by reversing the negative impact of water deficit, and highest seed yield was observed in a two-year study when both antioxidants were applied (EL Sabagh et al, 2017). In that study, as the distance between irrigation intervals widened, from 25, to 35, and then to 45 days, RWC leaf , chl content, number of siliques per plant, seed yield, oil content and oil and protein yield decreased significantly, but the application of AsA or SA restored values, or even improved them, relative to the control.…”

Exogenous Application of Proline and Salicylic Acid can Mitigate the Injurious Impacts of Drought Stress on Barley Plants Associated with Physiological and Histological Characters

“…By 2050, the population of the world will reach more than 9 billion people and the adverse climate changes will extremely threaten food security [3]. The plants under deficit water stress have distinctive morphological symptoms such as wilting, etiolation, yellowing, and leaf downfall [4,5]. Stomatal closure and reduction in CO 2 concentration are the first responses to drought stress in leaves, consequently reducing photosynthetic activity.…”

“…Accordingly, the plants can avoid ROS injury with upregulation of enzyme activity like catalase and polyphenol oxidase, which play vital roles in ROS scavenging [15][16][17]. Salicylic acid (SA) plays a main role under stress conditions in the regulation of photosynthesis and many physiological processes [13,18], proline metabolisms, and antioxidant defense systems as well as provides protection under abiotic stresses [19] and improves the growth characters and yield parameters of canola plant [4]. Use of SA significantly alleviated the injurious impacts of drought and decreased lipid peroxidation in wheat plants [20], increased growth characters and yield of faba bean plants, as well as improved activity of antioxidant enzymes [13].…”

Enhance Sunflower Productivity by Nitrogen Fertilizer Sources and Antioxidants Foliar Application under Sandy Soil Conditions of Toshka Region

“…Egyptian scientists have been made great efforts to use natural and biostimulants substances in order to increase plant growth and productivity. Salicylic acid (SA) (2hydroxybenzoic acid) is one of the these substances that is an endogenous growth hormone of phenolic nature and acts as potential non-enzymatic antioxidant which participates in the regulation of many physiological processes in plants, such as stomata closure, photosynthesis, ion uptake and transport, inhibition of ethylene biosynthesis, transpiration, membrane permeability, and plays an important role in plant growth and development (Mona Dawood et al, 2012;Abdel-Motagally et al, 2015;Ebtessam Yossef et al, 2015 andEL-Sabagh et al, 2017). Application of SA able to reduce the adverse influence of environmental stresses on crops and increase the yield components through morphological, physiological and biochemical mechanisms (Khademian and Yaghoubian, 2018).…”