Salinity induced changes in light harvesting and carbon assimilating complexes of Desmostachya bipinnata (L.) Staph.

Asrar, Hina; Hussain, Tabassum; Hadi, Syeda Midhat Sabahat; Gul, Bilquees; Nielsen, Brent L.; Khan, M. Ajmal

doi:10.1016/j.envexpbot.2016.12.008

Cited by 61 publications

(51 citation statements)

References 75 publications

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“…Salinity stress in plants leads to growth inhibition, leaf chlorosis, malfunction of the chloroplasts, and photoinhibition (Yamane et al 2004, Dąbrowski et al 2016, Acosta-Motos et al 2017, Dąbrowski et al 2017. Osmotic stress reduces PSII activity, decreases the effective quantum yield of PSII, and causes degradation of D1 protein leading to the inactivation of PSII reaction center (Batra et al 2014, Asrar et al 2017. Cadmium (Cd) is a toxic heavy metal and it causes leaf chlorosis, growth inhibition, and alters photosynthesis in plants (Nagajyoti et al 2010, Paunov et al 2018.…”

Section: Introductionmentioning

confidence: 99%

Special issue in honour of Prof. Reto J. Strasser - Chlorophyll a fluorescence parameters as indicators of a particular abiotic stress in rice

Faseela¹,

Sinisha²,

Brestič³

et al. 2020

Photosynt.

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The aim of this study was to evaluate the validity of some chlorophyll (Chl) a fluorescence parameters as early indicators of a particular abiotic stress and also to characterize the effect of different abiotic stresses [high light, NaCl, polyethylene glycol (PEG)-induced osmotic stress, and heavy metals] on the electron transport chain of rice (Oryza sativa L.) seedlings. The results clearly revealed that Chl a fluorescence parameters differ between abiotic stress types and also allowed us to select some parameters which were specifically and intensively affected under different abiotic stresses. We observed that the performance index is a common sensitive parameter to evaluate the effect of above four different abiotic stresses in rice seedlings. Certain Chl a fluorescence parameters were significant for a specific stress. The ratio between the rate constants of photochemical and nonphotochemical deactivation of excited Chl molecules (FV/F0) was prominently decreasing and the maximum quantum yield of nonphotochemical deexcitation was prominently increasing upon exposure to high light stress. The maximum quantum yield of electron transport and the electron transport from PSII donor side to PSII reaction center was highly reduced under NaCl stress in rice seedlings. Moreover, FV/F0 and PSII structure function index were prominently decreasing and the dissipation per cross section was significantly enhancing under PEG stress. The pool size of reduced plastoquinone on the reducing side of PSII [total complementary area between the fluorescence induction curve and maximal chlorophyll fluorescence (FM)], FM, and the probability by which electrons move from PSII to PSI acceptor side were significantly decreasing under heavy metal stress.Additional key words: JIP-test; photosynthesis; plant efficiency analyzer. Abbreviations: 1 -VI -the efficiency/probability with which a PSII trapped electron is transferred to PSI acceptor side; ABS/CS0absorption flux per cross section at t = 0; Area -total complementary area between the fluorescence induction curve and FM; DI0/CS0dissipated energy flux per cross section at t = 0; ET0/CS0 -electron transport flux per cross section at t = 0; FM -maximal chlorophyll fluorescence; F0 -minimal fluorescence; FV -variable fluorescence; FV/F0 -the ratio between the rate constants of photochemical and nonphotochemical deactivation of excited Chl molecules; FV/FM -maximum quantum efficiency of PSII under dark adaptation; PI(abs) -performance index; RC/ABS -fraction of active PSII reaction centers; SFI(abs) -PSII structure-function-index; Tf(max) -time to reach maximal fluorescence; TR0/CS0 -trapped energy flux per cross section at t = 0; VI -the relative variable fluorescence at I-step; VJ -the relative variable fluorescence at J-step; VK/VJ -the ratio of variable fluorescence in time 0.3 ms to variable fluorescence in time 2 ms as an indicator of the PSII donor side limitation; ΦD0 -maximum quantum yield of nonphotochemical deexcitation; ΦE0 -the electron transport quantum yield. Acknowledgem...

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Section: Introductionmentioning

confidence: 99%

Special issue in honour of Prof. Reto J. Strasser - Chlorophyll a fluorescence parameters as indicators of a particular abiotic stress in rice

Faseela¹,

Sinisha²,

Brestič³

et al. 2020

Photosynt.

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“…Salt stress is the foremost environmental factor that drastically decreases the crop yield in different geographic areas, especially in arid and semi-arid regions [1,2]. This has been forecast to gradually increase as a consequence of climate change [3].…”

Section: Introductionmentioning

confidence: 99%

Nitrogen Enhances Salt Tolerance by Modulating the Antioxidant Defense System and Osmoregulation Substance Content in Gossypium hirsutum

Sikder

Wang

Zhang

et al. 2020

Plants

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Increasing soil salinity suppresses both productivity and fiber quality of cotton, thus, an appropriate management approach needs to be developed to lessen the detrimental effect of salinity stress. This study assessed two cotton genotypes with different salt sensitivities to investigate the possible role of nitrogen supplementation at the seedling stage. Salt stress induced by sodium chloride (NaCl, 200 mmol·L −1 ) decreased the growth traits and dry mass production of both genotypes. Nitrogen supplementation increased the plant water status, photosynthetic pigment synthesis, and gas exchange attributes. Addition of nitrogen to the saline media significantly decreased the generation of lethal oxidative stress biomarkers such as hydrogen peroxide, lipid peroxidation, and electrolyte leakage ratio. The activity of the antioxidant defense system was upregulated in both saline and non-saline growth media as a result of nitrogen application. Furthermore, nitrogen supplementation enhanced the accumulation of osmolytes, such as soluble sugars, soluble proteins, and free amino acids. This established the beneficial role of nitrogen by retaining additional osmolality to uphold the relative water content and protect the photosynthetic apparatus, particularly in the salt-sensitive genotype. In summary, nitrogen application may represent a potential strategy to overcome the salinity-mediated impairment of cotton to some extent.Plants 2020, 9, 450 2 of 20 most sensitivity to salinity during the seedling growth stage, and remained sensitive at the reproductive stage [9]. Excess salinity inhibits plant growth and development by inducing osmotic stress, particular ion toxicity (Na + and Cl − ), oxidative damage, and/or nutritional disorders in plant tissues, which subsequently lead to weakened plant growth and endurance [10][11][12]. Salt stress has been shown to significantly decrease the uptake and metabolism of numerous mineral nutrients (such as nitrogen, potassium, phosphorus, and calcium), and accelerate the damage of the photosynthetic machinery as well as the whole salt tolerance mechanisms of plants. Salt stress-induced plant metabolism alterations are the secondary consequence of carbon and nitrogen metabolism [13]. Moreover, a high salt concentration perturbs electron transport systems in both chloroplasts and mitochondria [14,15]. This accelerates electron leakage from electron transportation chains and induces the generation of reactive oxygen species (ROS), such as superoxide radicals, hydroxyl radicals, and hydrogen peroxide [16,17]. The over-accumulation of ROS not only damages cellular and biological activities [18][19][20], but also degrades chlorophyll pigments and obstructs the synthesis of proteins, amino acids, lipids, deoxyribonucleic acid, as well as enzymatic and non-enzymatic activities of plants [17]. To avoid ROS-induced oxidative damage, plant-assured endogenous tolerance approaches, such as the antioxidant defense system as well as the accumulation of organic solutes and secondary metabolites [21]....

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“…The incident light on the leaf follows three paths: (i) re-emission of light energy by chlorophyll as fluorescence, (ii) photochemical energy transfer through the photosynthetic electron transport chain, and (iii) excess energy dissipation as heat via the xanthophyll cycle (Taiz and Zeiger 2006). Salt stress could disrupt thylakoid membrane proteins (Asrar et al 2017;Lin et al 2018;Peng et al 2019) and in particular may affect the photochemical efficiency of PSII (indicated by low F v /F m values) dynamically (reversible decline in F v /F m ) or chronically (sustained decline in F v /F m ) (Taiz and Zeiger (2006). Nevertheless, these alterations could be adaptations for survival by minimizing ROS accumulation at toxic levels at the cost of plant growth (Lovelock and Ball 2002;Asrar et al 2017;Zhou et al 2016).…”

Section: Photochemical Reactions: Outline and Salinity Effectsmentioning

confidence: 99%

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

Gulzar¹,

Hussain²,

Gul³

et al. 2020

Handbook of Halophytes

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This chapter attempts to synthesize recent work related to photosynthetic adaptations and oxidative stress mitigation mechanisms of perennial warm subtropical halophytes of Karachi, Pakistan. In most species the light-harvesting photochemical reactions appear less sensitive to increase in salinity treatments in comparison with those of carbon fixation. This was evident from unaltered F v /F m values which indicate the maximum photochemical efficiency and the degree of photoinhibition of PSII. However, there was a reduction in electron transport rate (ETR) and a rise in non-photochemical quenching (NPQ) by heat dissipation. Decrease in net photosynthetic rates (P N), stomatal conductance (gs), and transpiration

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Salinity induced changes in light harvesting and carbon assimilating complexes of Desmostachya bipinnata (L.) Staph.

Cited by 61 publications

References 75 publications

Special issue in honour of Prof. Reto J. Strasser - Chlorophyll a fluorescence parameters as indicators of a particular abiotic stress in rice

Special issue in honour of Prof. Reto J. Strasser - Chlorophyll a fluorescence parameters as indicators of a particular abiotic stress in rice

Nitrogen Enhances Salt Tolerance by Modulating the Antioxidant Defense System and Osmoregulation Substance Content in Gossypium hirsutum

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

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