Reactive oxygen species scavenging capacities of cotton (Gossypium hirsutum) cultivars under combined drought and heat induced oxidative stress

Sekmen, A. Hediye; Özgür, Rengin; Uzilday, Barış; Türkan, İsmail

doi:10.1016/j.envexpbot.2013.11.010

Cited by 155 publications

(108 citation statements)

References 75 publications

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“…Excess accumulation of H 2 O 2 in the plant cells might lead to the occurrence of oxidative stress (Foyer and Shigeoka ); therefore, H 2 O 2 levels must be regulated in order to protect enzymes and sustain metabolism. The increased H 2 O 2 content recorded in this study under combined stress conditions is in agreement with findings for simultaneously drought‐ and heat‐treated cotton (Sekmen et al ) and maize roots treated with combined osmotic and heat stresses (Yildiztugay et al ). Moreover, with the simultaneous application of stress agents, the SA treatments lowered the H 2 O 2 content only at 24 h of stress application in Tarm, but not in Özen.…”

Section: Discussionsupporting

confidence: 92%

“…Moreover, in the present study, the highest SOD activity for all treatment groups was observed in the Tarm cultivar. This result for SOD activity is in accordance with a study showing that SOD activity in a tolerant cotton genotype did not significantly change after 10 days of combined stress application (Sekmen et al ). In the present study, SA also decreased the activity of SOD in both genotypes during combined stress, as compared to roots treated only with PEG+35°C + NaCl.…”

Section: Discussionsupporting

confidence: 92%

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Time‐course analysis of salicylic acid effects on ROS regulation and antioxidant defense in roots of hulled and hulless barley under combined stress of drought, heat and salinity

Torun

2018

Physiologia Plantarum

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Greater crop losses can result from simultaneous exposure to a combination of drought, heat and salinity in the field. Salicylic acid (SA), a phenolic phytohormone, can affect a range of physiological and biochemical processes in plants and significantly impacts their resistance to these abiotic stresses. Despite numerous reports involving the positive effects of SA by applying each abiotic stress separately, the mechanism of SA-mediated adaptation to combined stresses remains elusive. This study, via a time-course analysis, investigated the role of SA on the roots of hulled and hulless (naked) barley (Hordeum vulgare L. 'Tarm' and 'Özen', respectively), which differed in salt tolerance, under the combined stress of drought, heat and salt. The combined stress caused marked reductions in root length and increases in proline content in both genotypes; however, Tarm exhibited better adaptation to the triple stress. Under the first 24 h of stress, superoxide dismutase (SOD; EC.1.15.1.1) and peroxidase (POX; EC.1.11.1.7) activity in the Tarm roots increased remarkably, while decreasing in the Özen roots. Furthermore, the Tarm roots showed higher catalase (CAT; EC 1.11.1.6), ascorbate peroxidase (APX; EC 1.11.1.11) and glutathione reductase (GR; EC 1.6.4.2) activity than the Özen during the combined stresses. The sensitivity of hulless barley roots may be related to decreasing SOD, POX, CAT and GR activity under stress. Over 72 h of stress, the SA pretreatment improved the APX and GR activity in Tarm and that of POX and CAT in Özen, demonstrating that exogenously applied SA regulates antioxidant defense enzymes in order to detoxify reactive oxygen species. The results of this study suggest that SA treatment may improve the triple-stress combination tolerance in hulled and hulless barley cultivars by increasing the level of antioxidant enzyme activity and promoting the accumulation of proline. Thus, SA alleviated the damaging effects of the triple stress by improving the antioxidant system, although these effects differed depending on characteristic of the hull of the grain.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionsupporting

confidence: 92%

Time‐course analysis of salicylic acid effects on ROS regulation and antioxidant defense in roots of hulled and hulless barley under combined stress of drought, heat and salinity

Torun

2018

Physiologia Plantarum

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“…Leaf relative water content (RWC) was established as an indicator of water status balance and plants with different leaf RWC could indicate a corresponding difference in leaf hydration, leaf water deficit and physiological water status [3, 49]. Decrease in RWC was a main factor causing decreased growth responding to osmotic stress in plants [50].…”

Section: Discussionmentioning

confidence: 99%

Drought stress had a predominant effect over heat stress on three tomato cultivars subjected to combined stress

et al. 2017

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BackgroundAbiotic stresses due to environmental factors could adversely affect the growth and development of crops. Among the abiotic stresses, drought and heat stress are two critical threats to crop growth and sustainable agriculture worldwide. Considering global climate change, incidence of combined drought and heat stress is likely to increase. The aim of this study was to shed light on plant growth performance and leaf physiology of three tomatoes cultivars (‘Arvento’, ‘LA1994’ and ‘LA2093’) under control, drought, heat and combined stress.ResultsShoot fresh and dry weight, leaf area and relative water content of all cultivars significantly decreased under drought and combined stress as compared to control. The net photosynthesis and starch content were significantly lower under drought and combined stress than control in the three cultivars. Stomata and pore length of the three cultivars significantly decreased under drought and combined stress as compared to control. The tomato ‘Arvento’ was more affected by heat stress than ‘LA1994’ and ‘LA2093’ due to significant decreases in shoot dry weight, chlorophyll a and carotenoid content, starch content and NPQ (non-photochemical quenching) only in ‘Arvento’ under heat treatment. By comparison, the two heat-tolerant tomatoes were more affected by drought stress compared to ‘Arvento’ as shown by small stomatal and pore area, decreased sucrose content, ΦPSII (quantum yield of photosystem II), ETR (electron transport rate) and qL (fraction of open PSII centers) in ‘LA1994’ and ‘LA2093’. The three cultivars showed similar response when subjected to the combination of drought and heat stress as shown by most physiological parameters, even though only ‘LA1994’ and ‘LA2093’ showed decreased Fv/Fm (maximum potential quantum efficiency of photosystem II), ΦPSII, ETR and qL under combined stress.ConclusionsThe cultivars differing in heat sensitivity did not show difference in the combined stress sensitivity, indicating that selection for tomatoes with combined stress tolerance might not be correlated with the single stress tolerance. In this study, drought stress had a predominant effect on tomato over heat stress, which explained why simultaneous application of heat and drought revealed similar physiological responses to the drought stress. These results will uncover the difference and linkage between the physiological response of tomatoes to drought, heat and combined stress and be important for the selection and breeding of tolerant tomato cultivars under single and combine stress.

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“…ROS production is increased under abiotic stresses (energy dissipation) and as a consequence cellular constituents including proteins and membrane lipids may be damaged (Mittler, 2002). Therefore ROS detoxification by enzymes (Xiao et al, 2008 ;Bian and Jiang, 2009;Fan et al, 2012;Salazar-Parra et al, 2012 ;Demeter et al, 2014;Sekmen et al, 2014;Song et al, 2014) or low molecular-weight compounds (Mittler, 2002) is essential for the functionality of leaf cells under abiotic stress. The xanthophyll cycle represents a plastid-specific ROS detoxification mechanism (Gallé et al, 2007;Haldimann et al, 2008;de la Rosa-Manzano et al, 2015), while other ROS detoxifying systems (e. g. superoxide dismutases) are present in several subcellular compartments (Locato et al, 2009;Simova-Stoilova et al, 2009;Snider et al, 2010;Song et al, 2014).…”

Section: Reactive Oxygen Species and Protection Of Chloroplast Constimentioning

confidence: 99%

“…Drought (Yordanov et al, 2000;Gilgen et al, 2010;Aranjuelo et al, 2011;Aimar et al, 2014) and heat (Haldimann and Feller, 2005;Sharkey, 2005;Fu et al, 2008;Chen et al, 2014;Cottee et al, 2014;Feng et al, 2014) as well as interactions between these two environmental stresses (Valladeres and Pearcy, 1997;Xu and Zhou, 2006;De Boeck et al, 2007;Grigorova et al, 2011Grigorova et al, , 2012Vile et al, 2012;Balla et al, 2014;Jagadish et al, 2014;Sekmen et al, 2014) must be considered for a comprehensive evaluation of carbon assimilation in the course of global change. Leaf temperature is often elevated in droughtstressed plants, since ambient temperature is also high and cooling by transpiration is less efficient when stomata are less open or epicuticular waxes are produced (Gallé and Feller, 2007;Gallé et al, 2007;Aharoni et al, 2004;Reynolds-Henne et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Drought stress and carbon assimilation in a warming climate: Reversible and irreversible impacts

Feller

2016

Journal of Plant Physiology

122

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Global change is characterized by increased CO2 concentration in the atmosphere, increasing average temperature and more frequent extreme events including drought periods, heat waves and flooding. Especially the impacts of drought and of elevated temperature on carbon assimilation are considered in this review. Effects of extreme events on the subcellular level as well as on the whole plant level may be reversible, partially reversible or irreversible. The photosynthetically active biomass depends on the number and the size of mature leaves and the photosynthetic activity in this biomass during stress and subsequent recovery phases. The total area of active leaves is determined by leaf expansion and senescence, while net photosynthesis per leaf area is primarily influenced by stomatal opening (stomatal conductance), mesophyll conductance, activity of the photosynthetic apparatus (light absorption and electron transport, activity of the Calvin cycle) and CO2 release by decarboxylation reactions (photorespiration, dark respiration). Water status, stomatal opening and leaf temperature represent a "magic triangle" of three strongly interacting parameters. The response of stomata to altered environmental conditions is important for stomatal limitations. Rubisco protein is quite thermotolerant, but the enzyme becomes at elevated temperature more rapidly inactivated (decarbamylation, reversible effect) and must be reactivated by Rubisco activase (carbamylation of a lysine residue). Rubisco activase is present under two forms (encoded by separate genes or products of alternative splicing of the premRNA from one gene) and is very thermosensitive. Rubisco activase was identified as a key protein for photosynthesis at elevated temperature (non-stomatal limitation). During a moderate heat stress Rubisco activase is reversibly inactivated, but during a more severe stress (higher temperature and/or longer exposure) the protein is irreversibly inactivated, insolubilized and finally degraded. On the level of the leaf, this loss of photosynthetic activity may still be reversible when new Rubisco activase is produced by protein synthesis. Rubisco activase as well as enzymes involved in the detoxification of reactive oxygen species or in osmoregulation are considered as important targets for breeding crop plants which are still productive under drought and/or at elevated leaf temperature in a changing climate.

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Reactive oxygen species scavenging capacities of cotton (Gossypium hirsutum) cultivars under combined drought and heat induced oxidative stress

Cited by 155 publications

References 75 publications

Time‐course analysis of salicylic acid effects on ROS regulation and antioxidant defense in roots of hulled and hulless barley under combined stress of drought, heat and salinity

Time‐course analysis of salicylic acid effects on ROS regulation and antioxidant defense in roots of hulled and hulless barley under combined stress of drought, heat and salinity

Drought stress had a predominant effect over heat stress on three tomato cultivars subjected to combined stress

Drought stress and carbon assimilation in a warming climate: Reversible and irreversible impacts

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