Antioxidant defence system and physiological responses of Iranian crested wheatgrass (Agropyron cristatum L.) to drought and salinity stress

Sheikh-Mohamadi, Mohamad Hossein; Etemadi, Nematollah; Nikbakht, Ali; Arab, Mostafa; Majidi, Mohammad Mahdi; Pessarakli, Mohammad

doi:10.1007/s11738-017-2543-1

Cited by 23 publications

(18 citation statements)

References 76 publications

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“…Remarkably, root PPO activity was noticeably increased by R. irregularis and F. coronatum upon D + HS. The change in different antioxidant enzyme activities in tomato plants in response to different stresses is related to the various forms of antioxidant enzyme metabolism; this has been proved by Sheikh Mohamadi et al [57] using wheatgrass genotypes under drought and salinity, and is also consistent with the finding of Tommasini et al [58] using Cenchrus ciliaris L under drought, heat, and their combination. Moreover, our results show a positive correlation between AM colonization and leaf CAT (r = 0.65 **) and root CAT (r = 0.51 *) (Table S2), where higher root CAT activity was found in plants inoculated with F. mosseae under D + HS (Figure 4).…”

Section: Discussionsupporting

confidence: 77%

Defense Enzymes in Mycorrhizal Tomato Plants Exposed to Combined Drought and Heat Stresses

et al. 2020

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As a result of climate change, drought and heat significantly reduced plant growth. Therefore, this study aims to explore and provide more insight into the effect of different arbuscular mycorrhizal fungi (AMF) strains (Rhizophagus irregularis, Funneliformis mosseae, and Funneliformis coronatum) on tomato plant tolerance against combined drought and heat stress, as well as combined drought and heat shock. A pot experiment was performed under controlled conditions in a growth chamber at 26/20 °C with a 16/8 h photoperiod. After six weeks of growth, one-third of plants were put in non-stress conditions, while another one-third were subjected to combined drought and heat stress (40% field capacity for two weeks and 38 °C/16 h and 30 °C/8 h for 5 days). The rest of the plants were exposed to combined drought and heat shock (40% of field capacity for two weeks and 45 °C for 6 h at the end of the drought period). All data were evaluated by one- and two-way analysis of variance (ANOVA). Means were compared by Duncan’s post hoc test at p < 0.05. The obtained results showed that combined drought and heat stresses had no significant impact on root colonization. Furthermore, stressed AMF plants exhibited a decrease in hydrogen peroxide and malondialdehyde content in the cells and showed changes in defense enzyme activities (peroxidase (POD), catalase (CAT), polyphenol oxidase (PPO), and glutathione S-transferase (GST)) in leaves as well as in roots compared with their relative non-mycorrhizal plants.

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Section: Discussionsupporting

confidence: 77%

Defense Enzymes in Mycorrhizal Tomato Plants Exposed to Combined Drought and Heat Stresses

et al. 2020

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“…The activities of superoxide dismutase (SOD), catalase (CAT), peroxidase (APX) and glutathione reductase (GR) were increased in Kentucky bluegrass and tall fescue under salt tress condition [32]. Similar results were observed in desert wheatgrass (Agropyron desertorum L.) and tall wheatgrass (Agropyron elongatum L.) [13,33]. The function of oxidant enzymes is to scavenge the ROS generated in plant cells.…”

Section: Salt Stressmentioning

confidence: 57%

“…[11,12]. Over millions of years of evolution, plants have developed integrated strategies to adapt to these sudden harsh conditions, e.g., the activities of antioxidant enzymes are increased under stressful conditions [13]. The different ways of using luminous energy between C 3 and C 4 turfgrass species is also involved in alleviation of stress-induced damage [14].…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of Environmental Stress Tolerance in Turfgrass

et al. 2020

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Turfgrasses constitute a vital part of the landscape ecological systems for sports fields, golf courses, home lawns and parks. However, turfgrass species are affected by numerous abiotic stresses include salinity, heat, cold, drought, waterlogging and heavy metals and biotic stresses such as diseases and pests. Harsh environmental conditions may result in growth inhibition, damage in cell structure and metabolic dysfunction. Hence, to survive the capricious environment, turfgrass species have evolved various adaptive strategies. For example, they can expel phytotoxic matters; increase activities of stress response related enzymes and regulate expression of the genes. Simultaneously, some phytohormones and signal molecules can be exploited to improve the stress tolerance in turfgrass. Generally, the mechanisms of the adaptive strategies are integrated but not necessarily the same. Recently, metabolomic, proteomic and transcriptomic analyses have revealed plenty of stress response related metabolites, proteins and genes in turfgrass. Therefore, the regulation mechanism of turfgrass’s response to abiotic and biotic stresses was further understood. However, the specific or broad-spectrum related genes that may improve stress tolerance remain to be further identified. Understanding stress response in turfgrass species will contribute to improve stress tolerance of turfgrass.

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“…In enzymatic antioxidant systems, APX and POD are essential enzymes in the cyclic activities of plants. APX and POD are necessary to transform H 2 O 2 to H 2 O and O 2 within the GSH-ascorbate cycle in chloroplasts (Sheikh-Mohamadi et al, 2017c). After 8, 16, and 24 d of the temperature treatments, the activity of APX increased in 'FA1' and 'FA2' under heat and cold stress (Fig.…”

Section: Resultsmentioning

confidence: 92%

“…3B-C). SOD is a key antioxidant enzyme that catalyzes the conversion of superoxide radicals to H 2 O 2 and molecular oxygen (Sheikh-Mohamadi et al, 2017c). SOD enzyme activity in 'FA1', 'FA3', and 'FA5' were higher than in other grasses under heat and cold conditions (Fig.…”

Section: Resultsmentioning

confidence: 95%

Correlation of Heat and Cold Tolerance in Iranian Tall Fescue Ecotypes with Reactive Oxygen Species Scavenging and Osmotic Adjustment

Sheikh-Mohamadi

Etemadi

Arab

2018

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Excessive heat or cold usually reduces the growth and quality of turfgrass. Genetic variations along with efficient biochemical and physiological mechanisms can diversify the tolerance to heat and cold. This study examined the effects of heat and cold stress on several biochemical and physiological parameters in Iranian tall fescue ecotypes (Festuca arundinacea L.). The control group of plants was maintained under optimal temperatures, whereas other groups were exposed to heat or cold in a growth chamber. The experiment was designed as a split plot, with stress treatments as the main plots and ecotypes as subplots. Physiologically and biochemically, the results revealed that three ecotypes (‘FA1’, ‘FA3’, and ‘FA5’) of the eight ecotypes examined in this study had better abilities to survive the simulated heat and cold stress. Better tolerance to heat and cold in the ‘FA1’, ‘FA3’, and ‘FA5’ ecotypes were probably due to higher levels of enzymatic and nonenzymatic antioxidant activities, maintenance of lower levels of malondialdehyde (MDA) and hydrogen peroxide (H2O2), higher levels of proline and total nonstructural carbohydrates (TNC), along with a more efficient osmotic adjustment. Diamine oxidase (DAO) and polyamine oxidase (PAO) activities increased significantly in ‘FA1’, ‘FA3’, and ‘FA5’ ecotypes. In summary, the strength of tolerance among ecotypes can be ranked as ‘FA1’ > ‘FA3’ > ‘FA5’ > ‘FA2’ > ‘FA6’ > ‘FA4’ > ‘FA7’ > ‘FA8’ under heat stress and ‘FA5’> ‘FA1’ > ‘FA3’ > ‘FA2’ > ‘FA4’ > ‘FA6’ > ‘FA7’ > ‘FA8’ under cold stress.

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Antioxidant defence system and physiological responses of Iranian crested wheatgrass (Agropyron cristatum L.) to drought and salinity stress

Cited by 23 publications

References 76 publications

Defense Enzymes in Mycorrhizal Tomato Plants Exposed to Combined Drought and Heat Stresses

Defense Enzymes in Mycorrhizal Tomato Plants Exposed to Combined Drought and Heat Stresses

Mechanisms of Environmental Stress Tolerance in Turfgrass

Correlation of Heat and Cold Tolerance in Iranian Tall Fescue Ecotypes with Reactive Oxygen Species Scavenging and Osmotic Adjustment

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