Changes in gas exchange, proline accumulation and antioxidative enzyme activities in three olive cultivars under contrasting water availability regimes

Ahmed, Chedlia Ben; Rouina, Béchir Ben; Şensoy, Serhat; Boukhris, Marouane; Abdallah, Ferjani Ben

doi:10.1016/j.envexpbot.2009.07.006

Cited by 201 publications

(152 citation statements)

References 33 publications

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“…Thus, in terms of comparison between ecotypes, the high SOD activity was observed in inland ecotypes, suggesting intraspecific differences in protection levels against drought stress. Similar to our results, a significant increase has been noted in the SOD activity in O. europea under drought stress conditions (Ben Ahmed et al 2009;Boughalleb & Mhamdi 2011). CAT is an extremely affective enzyme that speeds up the breakdown of hydrogen peroxide into water and oxygen (nearly six million molecules of H 2 O 2 per minute).…”

Section: Discussionsupporting

confidence: 78%

“…To maintain homeostasis and prevent oxidative stress, the plants have evolved a scavenging system composed of certain enzymes such as catalase (CAT, EC 1.11.1.6), superoxide dismutase (SOD, EC 1.15.1.1) and peroxidase (POD, EC 1.11.1.7), which can minimize the cellular damage (Gill &Tuteja 2010). The ability to increase antioxidant enzyme activities has been correlated with a degree of drought tolerance in A. spinosa (Chakhchar et al 2015a) and in multiple species such as Olea europea (Ben Ahmed et al 2009;Boughalleb & Mhamdi 2011). Thus, polyphenol oxidase (PPO, EC1.14.18.1) can involve in the regulation of the redox state of phenolic compounds under drought stress (Rivero et al 2001).…”

Section: Introductionmentioning

confidence: 99%

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Physiological and biochemical traits of drought tolerance inArgania spinosa

Chakhchar

Wahbi

Lamaoui

et al. 2015

Journal of Plant Interactions

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The objective of this study was to understand and characterize the physiological and biochemical tolerance mechanisms of Argania spinosa under drought stress for selection tolerant ecotypes. Significant differences were observed among ecotypes in indices of leaf water status studied: stomatal conductance (g s ), predawn leaf water potential (Ψ pd ) and leaf relative water content. There was a significant decrease in these physiological traits with increasing degree of drought stress in all ecotypes. Drought stress significantly increased endogenous H 2 O 2 and lipid peroxidation. Moderate and severe drought stress increased significantly the catalase, superoxide dismutase, peroxidase, polyphenoloxidase and lipoxygenase activities, depending on time. Their constitutive activities were higher in inland ecotypes than in coastal ecotypes. According to canonical discriminant analysis, the inland ecotypes were essentially distinguished from the coastal ecotypes by the following physiological and biochemical traits: Ψ pd , g s , polyphenol oxidase, superoxide dismutase and malonyldialdehyde. Inland ecotypes seem to be more tolerant to drought stress than coastal ecotypes.

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Section: Discussionsupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Physiological and biochemical traits of drought tolerance inArgania spinosa

Chakhchar

Wahbi

Lamaoui

et al. 2015

Journal of Plant Interactions

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“…The marked reduction of MDA concentration in 'Ghojagh', 'Rabab, and 'M-Saveh' after re-watering represents that these cultivars have a good adaptation to drought environments. Proline is one of the most important compatible solutes, and its concentration has been suggested as a general marker for screening drought tolerant cultivars (Ahmed et al 2009;Liu et al 2011). Sun et al (2013) reported that the accumulation of proline in chrysanthemum under drought stress was the result of damage and was not a suitable marker for chrysanthemum drought tolerance.…”

Section: Discussionmentioning

confidence: 99%

“…Proline content was positively correlated with SOD, G-POD and CAT activities at the end of drying cycle. It seems that proline may play an important role in reducing the injury caused by severe water stress by activating antioxidative defense mechanism (Ahmed et al 2009;Slabbert and Krüger 2014).…”

Section: Discussionmentioning

confidence: 99%

Responses of pomegranate cultivars to severe water stress and recovery: changes on antioxidant enzyme activities, gene expression patterns and water stress responsive metabolites

Pourghayoumi

Rahemi

Bakhshi

et al. 2017

Physiol Mol Biol Plants

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The biochemical and molecular responses of five commercially well-known pomegranate cultivars to severe water stress were studied. The cultivars were subjected to 14-day water stress by withholding irrigation, followed by re-watering for 7 days. Results showed clear differences in metabolites contents and activities of antioxidant enzymes among various pomegranate cultivars during severe water stress and recovery. According to our results, increased accumulation of proline in pomegranate was not related to osmotic adjustment during severe water stress. Except for 'Ghojagh', leaves grown under severe water stress conditions showed symptoms of oxidative stress such as reduced chlorophyll concentration. The improved performance of 'Ghojagh' under drought stress may be associated with an efficient osmotic adjustment. The up-or down regulated expression of cytosolic glutathione reductase (cytosolic GR) and glutathione peroxidase were observed under drought conditions. Moreover, the suppressed expression of cytosolic GR was also noted. Comparatively, 'Rabab' exhibited higher antioxidant capacity and an efficient ROSscavenging mechanism under drought stress. Lower levels of membrane lipid peroxidation in 'Ghojagh' and 'Rabab' under drought stress and the marked reduction of malondialdehyde concentration after re-watering represents that these cultivars have a good tolerance to drought stress. As a first step towards the study of the biochemical and molecular responses of pomegranate plants to water stress, this research provides new information into the mechanisms of drought tolerance in the plants.

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“…2B), whereas for cultivars Fepagro 27 and Madrugada, CAT activity began to decrease at the concentrations of 50 and 150 mM NaCl, respectively. The increase in CAT activity in stressed plants might be an adaptation to eliminate H 2 O 2 (Ben Ahmed et al 2009). Cultivar Petroline kept its antioxidant defense system more strongly activated than did the other cultivars during the stress caused by the increasing salt concentrations.…”

Section: Resultsmentioning

confidence: 99%

Salt stress: antioxidant activity as a physiological adaptation of onion cultivars

et al. 2013

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The germination and development of several plant species can be limited when those plants are grown in soils with high salinity, which reduces seedling viability and vigor, as well as activating the antioxidant defense system. The aim of this study was to evaluate germination, initial growth and activity of antioxidant enzymes (superoxide dismutase, catalase and ascorbate peroxidase) in seedlings of three onion cultivars (Madrugada, Fepagro 27 and Petroline) exposed to different concentrations of NaCl (0, 40, 80, 120 and 160 mM). Seedlings were evaluated for viability, vigor and antioxidant enzyme activity. The experimental procedures were completely randomized in 3 × 5 factorial design, with each treatment performed in triplicate, at a significance level of 5%. For all cultivars, viability and vigor decreased in parallel with increasing NaCl concentrations, whereas antioxidant enzyme activity increased, and one cultivar (Madrugada) showed less salt tolerance than did the others. We conclude that high NaCl concentrations have a negative effect in the physiological quality of onion seeds, resulting in lower seedling growth rates and increased antioxidant enzyme activity, where Fepagro 27 and Petroline cultivars were more tolerant to salt stress than 'Madrugada' .

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Changes in gas exchange, proline accumulation and antioxidative enzyme activities in three olive cultivars under contrasting water availability regimes

Cited by 201 publications

References 33 publications

Physiological and biochemical traits of drought tolerance inArgania spinosa

Physiological and biochemical traits of drought tolerance inArgania spinosa

Responses of pomegranate cultivars to severe water stress and recovery: changes on antioxidant enzyme activities, gene expression patterns and water stress responsive metabolites

Salt stress: antioxidant activity as a physiological adaptation of onion cultivars

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