Alleviation of copper toxicity on chloroplast antioxidant capacity and photosystem II photochemistry of wheat by hydrogen sulfide

Dai, Haifang; Xu, Y. L.; Zhao, Longfei; Shan, Changjuan

doi:10.1007/s40415-016-0250-6

Cited by 34 publications

(10 citation statements)

References 24 publications

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“…The decrements of Fv/Fm and ΦPSII suggested that LL stress generated photoinhibition by preventing the PSII electron transfer from QA to QB (Kumar and Prasad 2015). The apparent increments of Fv/Fm, ΦPSII, qP, and ETR in leaves under the combined application of NaHS and LL regime indicated that exogenous H2S promoted photochemical reaction in PSII and photochemical conversion efficiency (Dai et al 2016), which was consistent with enhanced Chl production. Chl was responsible for PSII function because intrinsic Chlbinding proteins could capture light energy to catalyze the water oxidation and reduction of plastoquinone (Eshaghi et al 1999).…”

Section: Discussionmentioning

confidence: 72%

“…It was observed that tall fescue plants supplied with NaHS under LL stress conditions demonstrated further increments in the activities of SOD, POD, and APX, which is in accordance with diminution in the content of MDA under identical treatment. The higher activities of above antioxidant enzymes might increase the resistance to oxidative damage and protected the function of photosynthetic machinery from LL-triggered damage (Dai et al 2016). These results suggested that H2S might act as a beneficial conductor in protecting chloroplasts and Chl pigment from cellular oxidative damage through increased activities of antioxidant enzyme in tall fescue.…”

Section: Discussionmentioning

confidence: 81%

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Hydrogen sulfide regulates photosynthesis of tall fescue under low-light stress

LIU¹,

ZHANG²,

Xu³

2019

Photosynt.

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Hydrogen sulfide (H2S) is regarded as gaseous signaling molecule in plant response to various biotic and abiotic stresses. In this study, we investigated potential role of H2S in modulating photosynthesis in low light (LL) stress-induced tall fescue (Festuca arundinacea Schreb.) seedlings. Results demonstrated that LL significantly reduced the plant height, leaf width, tiller number, dry mass, turf quality, chlorophyll content, net photosynthetic rate, stomatal conductance, intercellular CO2 concentration, transpiration rate, maximal quantum yield of PSII photochemistry, photochemical efficiency of PSII, photochemical quenching, electron transport rate, and enzymatic activity of ribulose-1,5-bisphosphate carboxylase. Then, these parameters were found to be considerably alleviated by H2S donor application. Moreover, exogenous application of NaHS decreased the concentration of malondialdehyde, increased activities of peroxidase, superoxide dismutase, ascorbate peroxidase, total soluble sugar, soluble protein, and endogenous concentration of H2S. In addition, these responses could be reversed by treatment with hypotaurine (H2S scavenger) and aminooxy acetic acid (H2S biosynthesis inhibitor). These results suggested that H2S was possibly involved in the regulation of photosynthesis to strengthen LL tolerance by maintaining a high level of photochemical efficiency and improving antioxidant enzyme activities in tall fescue.

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Section: Discussionmentioning

confidence: 72%

Section: Discussionmentioning

confidence: 81%

Hydrogen sulfide regulates photosynthesis of tall fescue under low-light stress

LIU¹,

ZHANG²,

Xu³

2019

Photosynt.

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“…As a non-redox-active metal, Ni cannot generate free radicals directly; however, it can indirectly trigger oxidative stress by destroying the balance of production and scavenging reactive oxygen species (ROS), such as hydrogen peroxide, hydroxyl and superoxide radicals, and single oxygen (Yilmaz and Parlak 2011). Copper plays an essential role in many enzyme systems but causes toxicity at higher concentration (Haifang et al 2016). This metal with its variable valency can directly participate in the production of highly toxic hydroxyl radicals during the Fenton and Haber-Weiss reactions, activating the chain reaction of lipid peroxidation, which leads to oxidative stress and the damage of cell membranes (Maksymiec 1997).…”

Section: Introductionmentioning

confidence: 99%

High dose of urea enhances the nickel and copper toxicity in Brazilian elodea (Egeria densa Planch. Casp.)

et al. 2016

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Selected cellular responses for urea (5 mM), Ni (100 lM), and Cu (100 lM) treatments and their combined effects on the leaves of a submerged macrophyte Brazilian elodea (Egeria densa Planch. Casp.) were studied for 4 days. It was observed that the high dose of urea (5 mM) had a significant toxic effect on some physiological and biochemical characteristics of E. densa such as the content of chlorophyll a and the activities of catalase, ascorbate peroxidase, and guaiacol peroxidase. The elevated level of lipid peroxidation was accompanied by the accumulation of proline and ascorbate. A substantial increase in the amount of proline and urease activity was observed in Urea ? Ni-treated leaves. The ascorbate content significantly increased in all the treated plants which correlated with ascorbate peroxidase activity. Urea with Cu ions affected the E. densa photosynthetic pigment system and urease activity adversely. The catalase activity was inhibited by the action of all the pollutants studied, especially in Urea ? Cu-treated plants, whereas the peroxidases activity (APX and GPX) increased under the Cu and Urea ? Cu action. The results presented indicate that the addition of the high dose of urea (5 mM) to the heavy metals studied may enhance the toxic effects in E. densa leaves, especially in the case of copper.

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“…H 2 O 2 can be transported by cell membrane aquaporins and react with DNA and proteins by oxidation of cysteine and methionine residues, causing long-distance oxidative damage [ 57 , 58 ]. Enhanced levels of H 2 O 2 were also observed in wheat ( Triticum aestivum L.), rice ( Oryza sativa L.), and Arabidopsis thaliana under Cu stress [ 21 , 59 , 60 ]. In this study, alfalfa seedlings treated with a high concentration of H 2 O 2 showed a similar phenotype as that after excess Cu treatment, indicating that Cu toxicity in plants was induced partially by H 2 O 2 oxidative damage.…”

Section: Discussionmentioning

confidence: 99%

Exogenous proanthocyanidins improve tolerance of Cu-toxicity by amelioration of oxidative damage and re-programming of gene expression in Medicago sativa

et al. 2021

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Excess copper (Cu) in soil due to industrial and agricultural practices can result in reduced plant growth. Excess Cu resulted in severely retarded root growth with severe discoloration of Alfalfa (Medicago sativa) and Medicago truncatula. Growth in the presence of hydrogen peroxide resulted in similar symptoms that could be partially recovered by the addition of the reductant ascorbic acid revealing damage was likely due to oxidative stress. The addition of proanthocyanidins (PAs) in the presence of Cu prevented much of the damage, including plant growth and restoration of lignin synthesis which was inhibited in the presence of excess Cu. Transcriptome analyses of the impact of excess Cu and the amelioration after PAs treatment revealed that changes were enriched in functions associated with the cell wall and extracellular processes, indicating that inhibition of cell wall synthesis was likely the reason for retarded growth. Excess Cu appeared to induce a strong defense response, along with alterations in the expression of a number of genes encoding transcription factors, notably related to ethylene signaling. The addition of PAs greatly reduced this response, and also induced novel genes that likely help ameliorate the effects of excess Cu. These included induction of genes involved in the last step of ascorbic acid biosynthesis and of enzymes involved in cell wall synthesis. Combined, these results show that excess Cu causes severe oxidative stress damage and inhibition of cell wall synthesis, which can be relieved by the addition of PAs.

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Alleviation of copper toxicity on chloroplast antioxidant capacity and photosystem II photochemistry of wheat by hydrogen sulfide

Cited by 34 publications

References 24 publications

Hydrogen sulfide regulates photosynthesis of tall fescue under low-light stress

Hydrogen sulfide regulates photosynthesis of tall fescue under low-light stress

High dose of urea enhances the nickel and copper toxicity in Brazilian elodea (Egeria densa Planch. Casp.)

Exogenous proanthocyanidins improve tolerance of Cu-toxicity by amelioration of oxidative damage and re-programming of gene expression in Medicago sativa

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