Antioxidative protection in wheat varieties under severe recoverable drought at seedling stag

Abstract

The antioxidative protection in leaves of four winter wheat (Triticum aestivum L.) varieties with different field drought resistance was studied under severe recoverable soil drought at seedling stage by withholding irrigation for 7 days (57-59% leaf water deficit) followed by rewatering. A 3-fold raise in electrolyte leakage and a sharp increase in proline accumulation corresponded to drought severity. Hydrogen peroxide content and catalase (CAT) activity were maintained low under stress. Peroxidase (GPX) activity increased, whereas superoxide dismutase (SOD) activity only slightly changed. The content of ascorbate and low-molecular thiols diminished under severe drought and was restored in recovery. Malondialdehyde level was not changed significantly in drought-treated plants but raised after re-watering. In recovery CAT activity became significantly higher whereas GPX activity diminished. Three isoforms of SOD, one of catalase and three of GPX were revealed. Proline accumulation had a predominant role in drought response. As for varieties, drought sensitivity or tolerance was not necessarily correlated with differences in the antioxidative response at early vegetative stage.

Role of inoculation with multi-trait rhizobacteria on strawberries under water deficit stress

“…These results are in agreement with those of other researchers (Wu et al, 2006), who reported that the activities of SOD, POD, CAT, APX and GR increased under drought stress. Plant cells stimulate different antioxidant enzymes such as CAT, POD, SOD and APX that eliminate these reactive free radicals or suppress their formation (Simova-Stoilova et al, 2008). These results suggest that the activities of SOD, POD and CAT, and contents of H 2 O 2 and MDA are the most important traits for plants' ability to survive under drought stress (Zhang et al, 2011).…”

The effects of spraying methanol solution and drought stress on level of antioxidant enzyme activity, growth, biomass and yield of beans (<italic>Phaseolus vulgaris</italic> L.cv.COS16)

“…4). CAT plays an important role in moving and scavenging hydrogen peroxide produced in peroxisomes and thus reduces the destructive effects of active oxygen strains (Simova-Stoilova et al, 2008). An experiment determined that increased catalase enzyme activity was effective in boosting resistance to drought stress in corn (Moussa and Abdel-Aziz, 2008).…”

Selection and Breeding of Suitable Crop Genotypes for Drought and Heat Periods in a Changing Climate: Which Morphological and Physiological Properties Should Be Considered?

“…Control of ROS accumulation and detoxification are key processes during abiotic stress phases, which play critical role for yield stability [10]. As ROS protection is common mechanism mobilized in many abiotic stresses including drought [126][127][128][129], heat [10,115,125,130,131] and their combination [122,132], ROS scavenging enzymes and compounds are good candidates for enhanced protection to multiple stress situations. Higher tolerance to drought and/or heat is associated with concerted up-regulation of key detoxifying enzymes in several crop species/varieties leading to better ROS protection along with stability of key metabolic processes like photosynthesis [132] and maintenance of the alternative mitochondrial respiration [123].…”