Salinity stress and hydrogen peroxide regulation of antioxidant defense system in Ulva fasciata

Lu, I-Fan; Sung, Ming-Shiuan; Lee, Tse‐Min

doi:10.1007/s00227-006-0323-3

Cited by 80 publications

(61 citation statements)

References 57 publications

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“…Conversely, inadequate antioxidant enzyme activities under hypersaline conditions (2.0 and 4.0 g NaCl L À1 ) might also be correlated with the early onset of bleaching and tissue necrosis symptoms. Lu et al (2006) also showed a decrease in the antioxidant activities in Ulva fasciata during 4 days of exposure to high salinity due to increased H 2 O 2 and MDA levels.…”

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confidence: 88%

Effect of NaCl salinity on the growth, metabolites, and antioxidant system ofMicrocystis aeruginosa

Zhang

2013

Journal of Freshwater Ecology

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The physiological and biochemical adaptations of the cyanobacterium Microcystis aeruginosa, grown in a saline environment, were estimated. M 11 cultures were exposed to variable salt concentrations (0.5, 1.0, 2.0, and 4.0 g NaCl L À1 ). The cell density and chlorophyll contents decreased with increasing salinity. The carbohydrate and protein contents were enhanced under lower salinities. The data demonstrated that M. aeruginosa could endure an osmotic potential of 4.0 g NaCl L À1, whereas growth was inhibited under hypersaline conditions above 2.0 g NaCl L À1. The antioxidant activities were evaluated, with salt stress exacerbating membrane lipid peroxidation as indicated by an increasing malondialdehyde (MDA) content. Obvious alterations in the antioxidant enzymes were diverse between the hypo and hypersalinities. Under the hyposaline treatments, high contents of superoxide dismutase (SOD) and catalase (CAT) were detected, whereas hypersaline treatments induced a decrease compared to the control. Accordingly, salinity might be a controlling factor inhibiting cyanobacterial blooms in saline lakes of the Mongolia-Xinjiang plateau, China.

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confidence: 88%

Effect of NaCl salinity on the growth, metabolites, and antioxidant system ofMicrocystis aeruginosa

Zhang

2013

Journal of Freshwater Ecology

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“…Transporters can allow the movement of molecules down chemical concentration gradients (facilitated diffusion), when the energy required for conformational changes in the transporter protein is molecular damage. Also catalase and several types of peroxidases are involved in H 2 O 2 removal [43]. This mechanism of scavenging ROS and preventing and repairing the damaging effects on macromolecules is critical for salt tolerant plants [43].…”

Section: Discussionmentioning

confidence: 99%

“…Also catalase and several types of peroxidases are involved in H 2 O 2 removal [43]. This mechanism of scavenging ROS and preventing and repairing the damaging effects on macromolecules is critical for salt tolerant plants [43].…”

Section: Discussionmentioning

confidence: 99%

“…into H 2 O 2 and oxygen [43]. The main assumption of salinity stress is that the normal levels of antioxidant defenses are not fully efficient to neutralize "reactive oxygen species" (ROS) and that a fraction of ROS escapes elimination, causing irreparable V. van Ginneken American Journal of Plant Sciences scribed in another manuscript.…”

Section: American Journal Of Plant Sciencesmentioning

confidence: 99%

“…This extreme salinity tolerance of Ulva spp. (U. fasciata) can also possibly be ascribed to the highly effective antioxidant defense mechanism against salinity stress [43]. During salinity stress of Ulva spp., free oxygen radicals arise during metabolism in the mitochondria.…”

Section: American Journal Of Plant Sciencesmentioning

confidence: 99%

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Some Mechanism Seaweeds Employ to Cope with Salinity Stress in the Harsh Euhaline Oceanic Environment

Ginneken¹

2018

AJPS

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In order to prevent salt damage because seaweed enzymes can only operate under hypohaline conditions (salinity ≈ 6‰ -12‰) but also obtain for photosynthesis an in the aquatic environment-due to a 10,000 fold strongly limited carbon source-seaweeds developed several mechanisms to meet these vital demands for survival in the harsh euhaline oceanic environment (salinity range: 32‰ -35‰), we tested this range of adaptation mechanisms in the euhaline oceanic collected water in combination with the seaweed moisture. We obtained under laboratory conditions at 10 bar mechanical pressure for four seaweed species: Ulva lactuca, Caulerpa sertularioides, Caulerpa cf. brachypus (all three green) and Undaria pinnatifidia (brown). Oceanic water and seaweed moisture were measured for salinity, pH and by Inductively Coupled Plasma Spectroscopy (ICP)-techniques concentrations for macro-elements: (Ca, Fe, K, Mg, Mn, Na, P, & S), micro-elements ≈ [HM]: (Al, As, Cd, Co, Cr, Cu, Mo, Ni, Pb & Zn) and nutrients (N-total & P-total). The [seawater compound X]/[oceanic compound X] ration is a reflection of an inward (uptake) or excretion mechanism over the seaweed cellular membrane which is operative. Our observations gave a clear dispersion to salinity stress with on one hand the green seaweed U. lactuca and on the other the brown seaweed U. pinnatifidia. Both Caulerpa spp. took in an intermediate position. Observed in compensatory responses to salinity stress was ranging Ulva sp. both Caulerpa spp.-Undaria sp.: 1) amount pressed seaweed moisture: [ml/g Fresh Weight]; 2) salinity: (in ‰); 3) Na + storage vacuole volume; 4) Na + :K + ratio (reflection of K + as osmolyticum); 5) ∑[HM] (as osmolyticum); 6) pH (seaweed moisture); 7) Nutrients (N & P); 8) availability of essential metal elements for plants (Cu, Fe, Zn, Mn, Mo, Ni); 9) transport direction of microand macro-elements. Finally, the role of brown vs. green seaweeds in the evolutionary eukaryotic tree of life in relation to the ability of the brown seaweeds to produce their own osmolyticum will be discussed.

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Oxidative Stress Tolerance Strategies of Intertidal Macroalgae

Aguilera

Rautenberger

2011

Oxidative Stress in Aquatic Ecosystems

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Salinity stress and hydrogen peroxide regulation of antioxidant defense system in Ulva fasciata

Cited by 80 publications

References 57 publications

Effect of NaCl salinity on the growth, metabolites, and antioxidant system ofMicrocystis aeruginosa

Effect of NaCl salinity on the growth, metabolites, and antioxidant system ofMicrocystis aeruginosa

Some Mechanism Seaweeds Employ to Cope with Salinity Stress in the Harsh Euhaline Oceanic Environment

Oxidative Stress Tolerance Strategies of Intertidal Macroalgae

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