Abstract
Plant in their natural environment are exposed to several stresses such as the drought that affect their growth and productivity. Exposure of plant to drought leads to oxidative stresses as a result of increase in ROS, however plant counteract this effect by its antioxidant system. H 2 O 2 , malondialdehyde, membrane stability index, catalase and ascorbate peroxidase activities where evaluated in leaves of two cowpea varieties drought tolerant (Dan’ila) and drought susceptible (TVU 7778) during 2 weeks water deficit and 5days recovery. The result indicates significant increase in the H 2 O 2, MDA, CAT and APX activities in both varieties during the stress period and significant decrease during recovery in drought tolerant variety compared to the drought susceptible variety. The membrane stability index decreases significantly during stress period in both varieties. Drought tolerant variety has the higher ability to counteract oxidant activity during the drought stress and recover faster than the drought susceptible variety. Keywords : Drought, antioxidant, cowpea DOI: 10.7176/JNSR/12-8-03 Publication date: April 30 th 2021
Highlights
Plants are exposed to different kinds of stress which may originate from human or natural causes such as drought
Drought induces lipid peroxidation leading to disruption of cell membrane. 1.1.0 Materials and methods The experiment was conducted between September to October 2018 at a greenhouse of Faculty of Agriculture, Bayero university, Kano (approximate temperature of 35/28 ̊C, 50–80% of relative humidity and 13 h photoperiod recorded with data log (11° 58 ́ N and 8° 25 ́ E 457m above sea level) in the savanna ecological zone of Nigeria
Drought stress stimulates the production of ROS (Lui and Huang,2000) because of stomatal aperture closure and low availability of CO2 and its fixation Ribulose 1,5bisphophate oxygenation is favoured and photorespiration is enhanced which account for more than 70% of the H2O2 produced as result of drought stress (Noctor et al, 2002).There was a significant increase in the amount of H2O2 (P
Summary
Plants are exposed to different kinds of stress which may originate from human or natural causes such as drought. Stress imposed stress on plants commonly accompanied by an increase in the production of reactive oxygen species (ROS) that lead to an imbalance between their production and scavenging. Despite their reactive and toxic nature, ROS are key components of signal transduction pathways that trigger stress responses. Each pot was irrigated to field capacity once daily with borehole water having 7.5 pH, 1.2 dsm−1 electrical conductivity (EC) and 1200 mg L−1 total soluble salts (TSS) until the start of the stress treatments. Water deficit was introduced at 5weeks after sowing by totally withholding irrigation for a period of 2 weeks for the stressed group. Sample of the plant leaves were collected at www.iiste.org
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