Photosynthetic Adaptations and Oxidative Stress Tolerance in Halophytes from Warm Subtropical Region

Gulzar, Salman; Hussain, Tabassum; Gul, Bilquees; Hameed, Abdul

doi:10.1007/978-3-030-57635-6_52

Cited by 5 publications

(8 citation statements)

References 112 publications

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“…Under abiotic stress, such as SS and AS, the efficiency of photosynthetic electron transport (Gulzar et al, 2020) and ATP synthesis in chloroplasts (Takagi et al, 2017) is known to decrease, leading to ROS accumulation in plants. In our study, transcriptome analysis revealed the identification of the top 20 GO terms for upregulated DEGs in Salt versus CT, including “photosynthetic electron transport in photosystem II (GO:0009772)” (Figure S3).…”

Section: Discussionmentioning

confidence: 99%

Integrated transcriptome and metabolome analysis reveals antioxidant machinery in grapevine exposed to salt and alkali stress

Chen

et al. 2023

Physiologia Plantarum

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Plant acclimation to salt and alkali stress is closely linked to the ability of the antioxidant system to mediate the scavenging of reactive oxygen species (ROS). In this study, we investigated the effects of salt stress and alkali stress on ROS, antioxidant enzymes, transcriptome, and metabolome. The results showed that the levels of superoxide anions, hydrogen peroxide, malondialdehyde, and electrolyte leakage increased under salt and alkali stress, with higher concentrations observed under alkali stress than salt stress. The activities of superoxide dismutase (EC 1.15.1.1), peroxidase (EC 1.11.1.7), catalase (EC 1.11.1.6), ascorbate peroxidase (EC 1.11.1.11), glutathione reductase (EC 1.6.4.2), dehydroascorbate reductase (EC 1.8.5.1), and monodehydroascorbate reductase (EC 1.6.5.4) varied under salt and alkali stress. The transcriptome analysis revealed the induction of signal transduction and metabolic processes and differential expression of genes encoding antioxidant enzymes in response to salt and alkali stress. The metabolome analysis demonstrated increased ascorbic acid and glutathione under salt stress, while most phenolic acids, flavonoids, and alkaloids increased under salt and alkali stress. Integrative analysis of the metabolome and transcriptome data revealed that the flavonoid biosynthesis pathway played a key role in the grapevine's response to salt stress. The total flavonoid content increased under salt and alkali stress, but the accumulation of flavonoids was higher under salt stress than alkali stress. In conclusion, our findings indicate significant differences in the antioxidant defense of grapevines under these two stresses, providing insight into distinct acclimation mechanisms in grapevine under salt and alkali stress.

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Section: Discussionmentioning

confidence: 99%

Integrated transcriptome and metabolome analysis reveals antioxidant machinery in grapevine exposed to salt and alkali stress

Chen

et al. 2023

Physiologia Plantarum

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“…CO 2 fixation processes are generally considered to be more sensitive to salt stress than photoreaction processes ( Gulzar et al., 2020 ). Besides stomatal limitation, photosynthetic enzymes also play significant roles in CO 2 assimilation and are affected by salinity.…”

Section: Chloroplast Sensitivity To Salt Stressmentioning

confidence: 99%

“…In chloroplasts, the triplet chlorophylls and the photosynthetic electron transport chains in PSII and PSI, all produce ROS ( Edreva, 2005 ). The reduction of CO 2 assimilation rates under salt stress results in the over-reduction of PSII along with electrons transporting to molecular oxygen, which generates ROS ( Bose et al., 2013 ; Ozgur et al., 2013 ; Gulzar et al., 2020 ). Under salt stress, electrons are prone to be transported from Ferredoxin to molecular oxygen, rather than NADP + , the final electron acceptor in PSI, and this pathway produces O 2 .- , which is dismutated into H 2 O 2 and O 2 by SOD ( Asada, 1999 ).…”

Section: Chloroplast Sensitivity To Salt Stressmentioning

confidence: 99%

Sensitivity and responses of chloroplasts to salt stress in plants

Wang,

Chen,

Sui

2024

Front. Plant Sci.

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Chloroplast, the site for photosynthesis and various biochemical reactions, is subject to many environmental stresses including salt stress, which affects chloroplast structure, photosynthetic processes, osmotic balance, ROS homeostasis, and so on. The maintenance of normal chloroplast function is essential for the survival of plants. Plants have developed different mechanisms to cope with salt-induced toxicity on chloroplasts to ensure the normal function of chloroplasts. The salt tolerance mechanism is complex and varies with plant species, so many aspects of these mechanisms are not entirely clear yet. In this review, we explore the effect of salinity on chloroplast structure and function, and discuss the adaptive mechanisms by which chloroplasts respond to salt stress. Understanding the sensitivity and responses of chloroplasts to salt stress will help us understand the important role of chloroplasts in plant salt stress adaptation and lay the foundation for enhancing plant salt tolerance.

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“…Salinity often results in biomass reduction, which is ascribed to a decline in CO2 assimilation in photosynthesis [19][20][21][22][23][24]. This decrease in net CO2 assimilation may result from stomatal closure to reduce transpiration and increase water use efficiency under salinity [25,26].…”

Section: Introductionmentioning

confidence: 99%

Thriving under Salinity: Growth, Ecophysiology and Proteomic Insights into the Tolerance Mechanisms of Obligate Halophyte Suaeda fruticosa

Gul,

Hameed,

Ahmed

et al. 2024

Plants

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Studies on obligate halophytes combining eco-physiological techniques and proteomic analysis are crucial for understanding salinity tolerance mechanisms but are limited. We thus examined growth, water relations, ion homeostasis, photosynthesis, oxidative stress mitigation and proteomic responses of an obligate halophyte Suaeda fruticosa to increasing salinity under semi-hydroponic culture. Most biomass parameters increased under moderate (300 mmol L−1 of NaCl) salinity, while high (900 mmol L−1 of NaCl) salinity caused some reduction in biomass parameters. Under moderate salinity, plants showed effective osmotic adjustment with concomitant accumulation of Na+ in both roots and leaves. Accumulation of Na+ did not accompany nutrient deficiency, damage to photosynthetic machinery and oxidative damage in plants treated with 300 mmol L−1 of NaCl. Under high salinity, plants showed further decline in sap osmotic potential with higher Na+ accumulation that did not coincide with a decline in relative water content, Fv/Fm, and oxidative damage markers (H2O2 and MDA). There were 22, 54 and 7 proteins in optimal salinity and 29, 46 and 8 proteins in high salinity treatment that were up-regulated, down-regulated or exhibited no change, respectively, as compared to control plants. These data indicate that biomass reduction in S. fruticosa at high salinity might result primarily from increased energetic cost rather than ionic toxicity.

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Photosynthetic Adaptations and Oxidative Stress Tolerance in Halophytes from Warm Subtropical Region

Cited by 5 publications

References 112 publications

Integrated transcriptome and metabolome analysis reveals antioxidant machinery in grapevine exposed to salt and alkali stress

Integrated transcriptome and metabolome analysis reveals antioxidant machinery in grapevine exposed to salt and alkali stress

Sensitivity and responses of chloroplasts to salt stress in plants

Thriving under Salinity: Growth, Ecophysiology and Proteomic Insights into the Tolerance Mechanisms of Obligate Halophyte Suaeda fruticosa

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