Physiological and biochemical responses of Scytonema javanicum (cyanobacterium) to salt stress

Tang, Danling; Shi, Sixue; Li, Didi; Hu, Chi‐Ming; Liu, Y.

doi:10.1016/j.jaridenv.2007.05.004

Cited by 73 publications

(37 citation statements)

References 34 publications

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“…Our results showed that increasing salt concentrations led to a significant change in SOD, POD, and CAT activities in evaluated plants. SOD kept a relatively high activity in the whole experiment process, which indicated that SOD played a critical role in scavenging ROS in A. annua under salt stress, and consolidated with the existing viewpoint which stated that SOD acted as a major scavenger in protecting the plant from ROS (Tang et al 2007). SOD effectively scavenged ROS at first that its activity recovered to a normal level finally.…”

Section: Discussionsupporting

confidence: 55%

“…SOD, POD, and CAT are among the major antioxidant enzymes involved in the scavenging of ROS (Amor et al 2005;Tang et al 2007). Our results showed that increasing salt concentrations led to a significant change in SOD, POD, and CAT activities in evaluated plants.…”

Section: Discussionmentioning

confidence: 99%

“…Decline in photosynthetic capacity negatively affected the accumulation of dry matter. (Guo et al 2011;He and Zhu 2008;Tang et al 2007). Additionally, salt stress produced plenty of reactive oxygen species (ROS) which stimulated the oxidative damage of lipids, proteins, and nucleic acids, even caused the degradation of membrane system (Demiral and Türkan 2005).…”

Section: Introductionmentioning

confidence: 99%

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The physiological response of Artemisia annua L. to salt stress and salicylic acid treatment

Lin

Zhang

et al. 2014

Physiol Mol Biol Plants

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Salinity has a great influence on plant growth and distribution. A few existing reports on Artemisia annua L. response to salinity are concentrated on plant growth and artemisinin content; the physiological response and salt damage mitigation are yet to be understood. In this study, the physiological response of varying salt stresses (50, 100, 200, 300, or 400 mM NaCl) on A. annua L. and the effect of exogenous salicylic acid (0.05 or 0.1 mM) at 300-mM salt stress were investigated. Plant growth, antioxidant enzyme activity, proline, and mineral element level were determined. In general, increasing salt concentration significantly reduced plant growth. Superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) were stimulated by salt treatment to a higher enzyme activity in treated plants than those in untreated plants. Content of proline had a visible range of increment in the salt-treated plants. Distribution of mineral elements was in inconformity: Na + and Ca 2+ were mainly accumulated in the roots; K + and Mg 2+ were concentrated in leaves and stems, respectively. Alleviation of growth arrest was observed with exogenous applications of salicylic acid (SA) under salt stress conditions. The activity of SOD and POD was notably enhanced by SA, but the CAT action was suppressed. While exogenous SA had no discernible effect on proline content, it effectively inhibited excessive Na + absorption and promoted Mg 2+ absorption. Ca 2+ and K + contents showed a slight reduction when supplemented with SA. Overall, the positive effect of SA towards resistance to the salinity of A. annua will provide some practical basis for A. annua cultivation.

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Section: Discussionsupporting

confidence: 55%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The physiological response of Artemisia annua L. to salt stress and salicylic acid treatment

Lin

Zhang

et al. 2014

Physiol Mol Biol Plants

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“…When green alga Dunaliella bioculata is stressed by chronic salt, its ultrastructure is changed severely (Bérubé et al 1999). Under NaCl stress, remarkable effects on the molecular structure and function of the photosynthetic apparatus are found in green alga Scenedesmus obliquus (Demetriou et al 2007), and the reduction of the maximum quantum yield of photosystem II (PSII) photochemistry (Fv/Fm) is found in D. salina (Liu & Shen, 2006) and cyanobacteria (Tang et al 2007). In cyanobacteria, the PSII mediated transport of electrons from water to DCIP (electron acceptors in PSII) was interfered under NaCl stress (Allakhverdiev et al 2000).…”

Section: Introductionmentioning

confidence: 99%

“…In cyanobacteria, the PSII mediated transport of electrons from water to DCIP (electron acceptors in PSII) was interfered under NaCl stress (Allakhverdiev et al 2000). In addition, NaCl stress can decrease the production of secondary carotenoid astaxanthin in algae (Orosa et al 2001;Pelah et al 2004), but increase the content of reactive oxygen species (ROS) (Tang et al 2007;Zhang et al 2013), glycerol pool (Goyal 2007), emission of volatile organic compounds (VOCs) (Zuo et al 2012a), and activities and expression levels of antioxidant enzymes (Yoshida et al 2004;Zhang et al 2013). Severe NaCl and KCl stresses even cause programmed cell death (PCD) in the green algae Micrasterias denticulate (Affenzeller et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Effects of NaCl and Na2CO3 stresses on photosynthetic ability of Chlamydomonas reinhardtii

et al. 2014

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Chloride and carbonate salts are the main salts causing salinization and widely exist in aquatic environment, so algae may suffer from salinization stress for high water evaporation. In this study, in order to investigate and compare the toxic effects of the two salts on algal photosynthesis, we used NaCl and Na2CO3 to stress Chlamydomonas reinhardtii. Under the two salt stresses, the content of O −.2 and H2O2 in the cells was increased significantly, and it was much higher in Na2CO3 treatment than in NaCl treatment at the same Na + concentration. The absorbance spectra and 4 th derivative spectra of photosynthetic pigments were declined under 300 mM NaCl and 25 mM Na2CO3 stresses, and remarkably changed under 50 mM and 100 mM Na2CO3 stresses. When the cells stressed by the two salts, the maximum quantum yield (Fv/Fm), electron transport rate (ETR) and photochemical quenching (qP) were reduced markedly, but the nonphotochemical dissipation (NPQ) was increased markedly. At the same Na + concentration, Na2CO3 stress had stronger toxic effects on photosynthetic ability than NaCl stress.

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Inoculation concentration modulating the secretion and accumulation pattern of exopolysaccharides in desert cyanobacterium Microcoleus vaginatus

Qian

Yang

et al. 2020

Biotech and App Biochem

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Cyanobacterial exopolysaccharides (EPS) accumulated during microalgal cultivation have significant application potential in antioxidation, pharmaceutical products, and so on. Inoculation concentration strongly affects the cultivation cost, biomass, and EPS accumulation. In this study, a high‐EPS‐excreted desert cyanobacterium Microcoleus vaginatus was isolated, and the effects of inoculation concentration on biomass, photosynthetic activity, and EPS accumulation were explored. The results showed that the original fluorescence (Fo) provided a good indication to cyanobacterial biomass, when Chl‐a concentration was lower than 10 mg L−1. Inoculation concentration significantly affected cyanobacterial biomass and EPS concentration (P < 0.001), whereas did not affect photosynthetic activity (Fv/Fm; P > 0.05). The two fractions of EPS, capsular exopolysaccharides (CPS) and released exopolysaccharides (RPS) were strongly affect by inoculation concentration. Other than forming thick sheath (CPS) surrounded the filaments, M. vaginatus excreted higher proportions of RPS to culture medium, and the ratio of RPS to CPS ranged from 1.08 to 1.58 depending on the inoculation concentration. Additionally, although the biomass and EPS accumulation increased with inoculation concentration, the increasing inoculation concentration did not bring to the proportionate increase of the final biomass and EPS yield. Altogether, comprehensively considering the EPS yield and productivity, inoculation concentration of 0.04 mg Chl‐a L−1 is recommended for M. vaginatus to produce EPS, with an EPS yield of 94.32 mg L−1 and EPS productivity of 184.86 mg (mg Chl‐a)−1 L−1 d−1 at the end of experiment.

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Physiological and biochemical responses of Scytonema javanicum (cyanobacterium) to salt stress

Cited by 73 publications

References 34 publications

The physiological response of Artemisia annua L. to salt stress and salicylic acid treatment

The physiological response of Artemisia annua L. to salt stress and salicylic acid treatment

Effects of NaCl and Na2CO3 stresses on photosynthetic ability of Chlamydomonas reinhardtii

Inoculation concentration modulating the secretion and accumulation pattern of exopolysaccharides in desert cyanobacterium Microcoleus vaginatus

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