Salinity Stress Affects Photosynthesis, Malondialdehyde Formation, and Proline Content in Portulaca oleracea L.

Hniličková, Helena; Kraus, Kamil; Vachová, Pavla; Hnilička, František

doi:10.3390/plants10050845

Cited by 158 publications

(73 citation statements)

References 72 publications

(79 reference statements)

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“…Interestingly, “746” and “747” showed the maximum content at 100 mM NaCl, while in landrace “751”, MDA content reached its peak at 300 mM NaCl. Such findings are in total agreement with the previously reported inconclusive differences in MDA level in purslane plants subjected to varying salt stress levels, where the MDA content showed a peak after exposure at 300 mM NaCl for 6 or 9 days [ 57 ]. In general, the increased MDA and O2- synthesis under salt stress has been associated with damage to cell membrane integrity and protein activity, although the damage recorded depends on the stress period [ 58 ].…”

Section: Discussionsupporting

confidence: 93%

The Effects of Salt Stress on Germination, Seedling Growth and Biochemical Responses of Tunisian Squash (Cucurbita maxima Duchesne) Germplasm

Tarchoun

Saadaoui

Mezghani

et al. 2022

Plants

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Salt stress is considered as one of the most common abiotic stresses reducing the productivity and fruit quality of crop plants. The present study was carried out to assess the salt tolerance among 15 local squash (Cucurbita maxima Duchesne) landraces. Different salt (NaCl) concentrations of 0, 100, 200 and 300 mM were selected in order to evaluate the response of the study germplasm to salt stress based on 12 agronomic parameters and 3 biochemical traits, proline, malondialdehyde (MDA) and chlorophylls. A varied effect of the salt stress level was observed among the studied landraces based on germination potential, as well as on growth and biochemical parameters at seedling stage. Results showed that all landraces were drastically affected at high stress level with a significant variation in their stress response, indicating the existence of considerable genetic variability. Landraces “746” and “747” were the best performing cultivars across stress levels, whereas “1007”, “1008” and “1009” were the most negatively affected. Based on the tested landrace performance, four landraceswere selected and further evaluated at biochemical level, focusing on the determination of compounds that play a key role in the ability to withstand salt stress. The mean MDA content across landraces was generally increased in stressed plants, as compared to the control treatment; the increase was attributed to a peak in MDA content at specific stress levels. In particular, “746” and “1007” showed the maximum content at 100 mM NaCl, while in landrace “751”, MDA content reached its peak at 300 mM NaCl. In addition, the response of most landraces to salt stress involved an increase in free proline content, with the exception of “746”, with the maximum content being observed either at 200 mM (“748” and “751” landraces) or at 300 mM NaCl, where only “747” expressed the highest content. These findings can be extrapolated into efforts to develop more salt-tolerant squash landraces and exhaust the possibilities of using saline water or soils under changing climate conditions.

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Section: Discussionsupporting

confidence: 93%

The Effects of Salt Stress on Germination, Seedling Growth and Biochemical Responses of Tunisian Squash (Cucurbita maxima Duchesne) Germplasm

Tarchoun

Saadaoui

Mezghani

et al. 2022

Plants

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“…These results also illustrate the higher antagonistic interaction of N with Na and Cl that might have improved the assimilatory function of the nitrogenous biochemical machinery, leading to an increase in the nitrogen yield efficiency, physiological nitrogen efficiency, photosynthetic nitrogen use efficiency, and nitrogen harvest index. This indicates that the increased concentration of N balanced the photosynthetic system under salinity stress through assimilation of carbon dioxide to increase stomatal conductivity in the C plant skeleton [25,68,69]. Similar results were also reported by Song et al [70], attributing improved NUE to optimal N supply in oat plant under salinity stress.…”

Section: Discussionsupporting

confidence: 85%

Can Different Salt Formulations Revert the Depressing Effect of Salinity on Maize by Modulating Plant Biochemical Attributes and Activating Stress Regulators through Improved N Supply?

Javed

Arif²,

Shahzad

et al. 2021

Sustainability

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Salinity is a major constraint in improving agricultural productivity due to its adverse impact on various physiological and biochemical attributes of plants, and its effect on reducing nitrogen (N) use efficiency due to ion toxicity. To understand the relationship between sodium chloride (NaCl) and increased N application rates, a pot study was performed in which the ammonical (NH4+) form of N was applied as urea to maize crops at different rates (control, 160, 186, 240, 267, 293, and 320 kg N ha−1) using two salinity levels (control and 10 dS m−1 NaCl). The results indicate that all biochemical and physiological attributes of the maize plant improved with increased concentration of N up to 293 kg ha−1, compared to those in the control treatment. Similarly, the optimal N concentration regulated the activities of antioxidant enzymes, i.e., catalase activity (CAT), peroxidase activity (POD), and superoxide dismutases (SOD), and also increased the N use efficiencies of the maize crop up to 293 kg N ha−1. Overall, our results show that the optimum level of N (293 kg ha−1) improved the salinity tolerance in the maize plant by activating stress coping physiological and biochemical mechanisms. This may have been due to the major role of N in the metabolic activity of plants and N assimilation enzymes activity such as nitrate reductase (NR) and nitrite reductase (NiR).

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“…Abiotic factors, including salinity, reduce the photosynthetic rate. Elevated levels of NaCl also hamper stomatal function, uptake of CO 2 and ultimately photosynthesis ( Hnilickova et al, 2021 ). In the present study, a reduction in photosynthetic pigments was markedly observed under salinity stress in the tested okra varieties.…”

Section: Discussionmentioning

confidence: 99%

Alpha Tocopherol-Induced Modulations in the Morphophysiological Attributes of Okra Under Saline Conditions

et al. 2021

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Foliar spray of antioxidants is a pragmatic approach to combat various effects of salinity stress in agricultural crops. A pot trial was conducted to examine the effect of exogenously applied α-tocopherol (α-Toc) as foliar spray to induce morpho-physiological modulations in two varieties (Noori and Sabzpari) of okra grown under salt stress conditions (0 mM and 100 mM NaCl). After 36 days of salinity treatments, four levels (0, 100, 200 and 300 mg L–1) of α-tocopherol were sprayed. Salt stress significantly reduced root and shoot fresh and dry biomass, photosynthesis rate (A), transpiration rate (E), water use efficiency (A/E), stomatal conductance, internal CO2 concentration (Ci)and Ci/Ca), and photosynthetic pigments. Foliar spray of α-tocopherol proved effective in improving the growth of okra by significantly enhancing root dry weight, root length, shoot fresh weight, shoot length, Chl. a, Chl. b, Total chl., β-Car., Total Car., A, E, A/E, Ci, and Ci/Ca, leaf and root Ca2+ and K+ ion content, total soluble sugars, non-reducing sugars and total soluble protein content by significantly reducing root Na+ ion content. The Okra variety Noori performed better than Sabzpari in the examined attributes, and 300 mg L–1 application of α-tocopherol was more pronounced in improving the growth of okra by alleviating salinity effects. Therefore, the use of α-tocopherol (300 mg L–1) as a foliar spray is recommended to improve okra production in saline soils.

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Salinity Stress Affects Photosynthesis, Malondialdehyde Formation, and Proline Content in Portulaca oleracea L.

Cited by 158 publications

References 72 publications

The Effects of Salt Stress on Germination, Seedling Growth and Biochemical Responses of Tunisian Squash (Cucurbita maxima Duchesne) Germplasm

The Effects of Salt Stress on Germination, Seedling Growth and Biochemical Responses of Tunisian Squash (Cucurbita maxima Duchesne) Germplasm

Can Different Salt Formulations Revert the Depressing Effect of Salinity on Maize by Modulating Plant Biochemical Attributes and Activating Stress Regulators through Improved N Supply?

Alpha Tocopherol-Induced Modulations in the Morphophysiological Attributes of Okra Under Saline Conditions

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