共查询到20条相似文献,搜索用时 15 毫秒
1.
Juan Chen Wen-Hua Wang Fei-Hua Wu Chun-Yan You Ting-Wu Liu Xue-Jun Dong Jun-Xian He Hai-Lei Zheng 《Plant and Soil》2013,362(1-2):301-318
Aims
Aluminum (Al) toxicity is one of the major factors that limit plant growth. Low concentration of hydrogen sulfide (H2S) has been proven to function in physiological responses to various stresses. The objective of this study is to investigate the possible role of H2S in Al toxicity in barley (Hordeum vulgare L) seedlings.Methods
Barley seedlings pre-treated with sodium hydrosulfide (NaHS), a H2S donor, and subsequently exposed to Al treatment were studied for their effects on root elongation, Al accumulation in seedlings, Al-induced citrate secretion and oxidative stress, and plasma membrane (PM) H+-ATPase expression.Results
Our results showed that H2S had significant rescue effects on Al-induced inhibition of root elongation which was correlated well with the decrease of Al accumulation in seedlings. Meanwhile, Al-induced citrate secretion was also significantly enhanced by NaHS pretreatment. Al-induced oxidative stress as indicated by lipid peroxidation and reactive oxygen species burst was alleviated by H2S through the activation of the antioxidant system. Moreover, Al-induced reduction in PM H+-ATPase expression was reversed by exogenous NaHS.Conclusions
Altogether, our results suggest H2S plays an ameliorative role in protecting plants against Al toxicity by inducing the activities of antioxidant enzymes, increasing citrate secretion and citrate transporter gene expression, and enhancing the expression of PM H+-ATPase. 相似文献2.
Sheng Xu Susong Zhu Yilong Jiang Ning Wang Ren Wang Wenbiao Shen Jie Yang 《Plant and Soil》2013,370(1-2):47-57
3.
Lead (Pb) is a widespread ecosystem pollutant and affects food security and public health. Hydrogen sulfide (H2S) plays prominent roles in mediating a variety of responses to stresses. The effects of sodium hydrosulfide (NaHS), a fast releaser of H2S, on cauliflower (Brassica oleracea L. var botrytis L. cv. Xiahua 60 d) seed germination and seedling growth under lead acetate stress were investigated in the present study. Pb (0.25 and 0.5 mM) stresses markedly inhibited seed germination and seedling growth, whereas the inhibition was effectively mitigated by NaHS application. Germination percentage, root length, shoot length, and fresh weight of single seedling significantly increased. In addition, NaHS elevated endogenous H2S contents and reduced malonyldialdehyde, superoxide anion (\({\text{O}}_{\text{2}}{\cdot}^ -\)), and hydrogen peroxide (H2O2) production, thereby preventing oxidative damage from Pb or Pb and antioxidant enzyme inhibitor (diethyldithiocarbamate or 3-amino-1,2,4-triazole) dual stresses. The protective roles of NaHS were equivalent to the ROS scavengers, 4,5-dihydroxy-1,3-benzene disulfonic acid? and N,N′-Dimethylthiourea. Moreover, NaHS elevated non-protein thiols and total glutathione levels to chelate Pb or scavenge ROS directly. Our results demonstrated the strong protective and antioxidant roles of H2S. 相似文献
4.
Key message
By using pharmacological and molecular approaches, we discovered the involvement of HO-1 in NaHS-induced lateral root formation in tomato seedlings.Abstract
Heme oxygenase-1 (HO-1) and hydrogen sulfide (H2S) regulate various responses to abiotic stress and root development, but their involvement in the simultaneous regulation of plant lateral root (LR) formation is poorly understood. In this report, we observed that the exogenously applied H2S donor sodium hydrosulfide (NaHS) and the HO-1 inducer hemin induce LR formation in tomato seedlings by triggering intracellular signaling events involving the induction of tomato HO-1 (SlHO-1), and the modulation of cell cycle regulatory genes, including the up-regulation of SlCDKA;1 and SlCYCA2;1, and simultaneous down-regulation of SlKRP2. The response of NaHS in the induction of LR formation was impaired by the potent inhibition of HO-1, which was further blocked when 50 % saturation of carbon monoxide (CO) aqueous solution, one of the catalytic by-products of HO-1, was added. Further molecular evidence revealed that the NaHS-modulated gene expression of cell cycle regulatory genes was sensitive to the inhibition of HO-1 and reversed by cotreatment with CO. The impairment of LR density and length as well as lateral root primordia number, the decreased tomato HO-1 gene expression and HO activity caused by an H2S scavenger hypotaurine were partially rescued by the addition of NaHS, hemin and CO (in particular). Together, these results revealed that at least in our experimental conditions, HO-1 might be involved in NaHS-induced tomato LR formation. Additionally, the use of NaHS and hemin compounds in crop root organogenesis should be explored. 相似文献5.
Kamel Hessini Karim Ben Hamed Mhemmed Gandour Maroua Mejri Chedly Abdelly Cristina Cruz 《Plant and Soil》2013,370(1-2):163-173
Background and aims
The effects of salt stress on the salt marsh halophyte Spartina alterniflora have been well documented. However, plant responses to combined salinity and ammonium toxicity and the underlying mechanisms are relatively unknown. The aim of the present investigation was to study the effects of both salinity (0, 200 and 500 mM NaCl) and nitrogen form (NO3 ?, NH4 + or NH4NO3) on S. alterniflora.Methods
Plants were cultivated in sandy soil under greenhouse conditions for 3 months. At harvest, growth parameters were measured and leaf samples were analysed for oxidative stress parameters (malondialdehyde, MDA; electrolyte leakage, EL; and hydrogen peroxide, H2O2 concentration) and the activity of antioxidant enzymes (glutathione reductase, GR; superoxide dismutase, SOD; catalase, CAT; ascorbate peroxidase, APX and Guaiacol peroxidase, GPX).Results
In the absence of NaCl, plant growth rate was the highest in the medium containing both nitrogen forms, and the lowest in the medium containing only nitrate. Irrespective of the nitrogen form, plant growth was generally higher at 200 mM NaCl than without salinity. Ammonium-fed plants showed better growth than nitrate-fed plants under high salinity. In the absence of salinity, ammonium-fed plants showed higher SOD, APX, GR, CAT, and GPX activities than nitrate-fed ones. The antioxidant enzymes exhibited higher activity in saline-treated plants. The considerable advantage of NH4 + nutrition to S. alterniflora under saline conditions was associated with high antioxidant enzyme activities, together with low MDA content, EL, and H2O2 concentration.Conclusion
These data clearly demonstrate that NH4 + is more favourable for the growth of S. alterniflora under high salinity than NO3 ?. It is suggested that NH4 + nutrition improves the plant’s capacity to limit oxidative damage by stimulating the activities of the major antioxidant enzymes. 相似文献6.
7.
Aims
The purpose of the present study was to investigate the mechanism of carbon monoxide (CO) and hematin in alleviating the inhibition of Cassia obtusifolia seeds and seedlings. NaCl (100?mM) was used to mimic salinity stress in a series of experiments.Methods
Varying combinations of CO in a saturated aqueous solution and hematin (1.0?μM) were added to seeds and seedlings under salinity stress. Seed germination indices and seedling parameters were investigated.Results
Seed germination and seedling growth were significantly inhibited under salinity stress. NaCl-induced inhibitory effects on seed germination and seedling growth were ameliorated by hematin or the CO aqueous solution. Addition of 1.0?μM hematin or 5?% CO-saturated aqueous solution to seeds and seedlings significantly alleviated damage to the plant cells under salinity stress. Hematin and the CO aqueous solution enhanced chlorophyll concentration, total soluble sugars, free proline, and soluble protein, and improved photosystem II (PSII) photochemical efficiency levels, PSII actual photochemical efficiency, and the photochemical quench coefficient. In contrast, the non-photochemical quenching coefficient decreased. Hematin and the CO aqueous solution also enhanced the activities of superoxide dismutase, peroxidase, catalase, ascorbate peroxidase, and glutathione reductase, thus alleviating oxidative damage, as indicated by decreases in hiobarbituric acid reactive substances, hydrogen peroxide concentration, relative conductivity, and lipoxygenase activity. Heme oxygenase (HO) activity was increased by hematin treatment. Hematin may contribute to endogenous HO-derived CO, since the addition of zinc protoporphyrin IX or hemoglobin reversed the protective effects conferred by hematin specified above.Conclusions
Based on the experimental results, we conclude that hematin and CO induce advantageous effects on the attenuation of salt-stress inhibition of C. obtusifolia seeds and seedlings and alleviate oxidative damage by conferring beneficial cytoprotection and activating anti-oxidant enzymes. 相似文献8.
Background
A reduction in cochlear blood flow plays an essential role in noise-induced hearing loss (NIHL). The timely regulation of cochlear perfusion determines the progression and prognosis of NIHL. Hydrogen sulfide (H2S) has attracted increasing interest as a vasodilator in cardiovascular systems. This study identified the role of H2S in cochlear blood flow regulation and noise protection.Methodology/Principal Findings
The gene and protein expression of the H2S synthetase cystathionine-γ-lyase (CSE) in the rat cochlea was examined using immunofluorescence and real-time PCR. Cochlear CSE mRNA levels varied according to the duration of noise exposure. A chronic intracochlear infusion model was built and artificial perilymph (AP), NaHS or DL-propargylglycine (PPG) were locally administered. Local sodium hydrosulfide (NaHS) significantly increased cochlear perfusion post-noise exposure. Cochlear morphological damage and hearing loss were alleviated in the NaHS group as measured by conventional auditory brainstem response (ABR), cochlear scanning electron microscope (SEM) and outer hair cell (OHC) count. The highest percentage of OHC loss occurred in the PPG group.Conclusions/Significance
Our results suggest that H2S plays an important role in the regulation of cochlear blood flow and the protection against noise. Further studies may identify a new preventive and therapeutic perspective on NIHL and other blood supply-related inner ear diseases. 相似文献9.
Weiming Sun Jinxia Yang Yuanzhou Zhang Yuxin Xi Xin Wen Di Yuan Yuehong Wang Can Wei Rui Wang Lingyun Wu Hongzhu Li Changqing Xu 《Cell & Bioscience》2017,7(1):67
Background
A gasotransmitter hydrogen sulfide (H2S) plays an important physiological and pathological role in cardiovascular system. Ischemic post-conditioning (PC) provides cardioprotection in the young hearts but not in the aged hearts. Exogenous H2S restores PC-induced cardioprotection by inhibition of mitochondrial permeability transition pore opening and oxidative stress and increase of autophagy in the aged hearts. However, whether H2S contributes to the recovery of PC-induced cardioprotection via down-regulation of endoplasmic reticulum stress (ERS) in the aged hearts is unclear.Methods
The aged H9C2 cells (the cardiomyocytes line) were induced using H2O2 and were exposed to H/R and PC protocols. Cell viability was observed by CCK-8 kit. Apoptosis was detected by Hoechst 33342 staining and flow cytometry. Related protein expressions were detected through Western blot.Results
In the present study, we found that 30 μM H2O2 induced H9C2 cells senescence but not apoptosis. Supplementation of NaHS protected against H/R-induced apoptosis, the expression of cleaved caspase-3 and cleaved caspase-9 and the release of cytochrome c. The addition of NaHS also counteracted the reduction of cell viability caused by H/R and decreased the expression of GRP 78, CHOP, cleaved caspase-12, ATF 4, ATF 6 and XBP-1 and the phosphorylation of PERK, eIF 2α and IRE 1α. Additionally, NaHS increased Bcl-2 expression. PC alone did not provide cardioprotection in H/R-treated aged cardiomyocytes, which was significantly restored by the supplementation of NaHS. The beneficial role of NaHS was similar to the supply of 4-PBA (an inhibitor of ERS), GSK2656157 (an inhibitor of PERK), STF083010 (an inhibitor of IRE 1α), respectively, during PC.Conclusion
Our results suggest that the recovery of myocardial protection from PC by exogenous H2S is associated with the inhibition of ERS via down-regulating PERK-eIF 2α-ATF 4, IRE 1α-XBP-1 and ATF 6 pathways in the aged cardiomyocytes.10.
Liu-Hui Fu Zeng-Zheng Wei Kang-Di Hu Lan-Ying Hu Yan-Hong Li Xiao-Yan Chen Zhuo Han Gai-Fang Yao Hua Zhang 《Journal of microbiology (Seoul, Korea)》2018,56(4):238-245
Many studies have shown that hydrogen sulfide (H2S) is both detrimental and beneficial to animals and plants, whereas its effect on bacteria is not fully understood. Here, we report that H2S, released by sodium hydrosulfide (NaHS), significantly inhibits the growth of Escherichia coli in a dose-dependent manner. Further studies have shown that H2S treatment stimulates the production of reactive oxygen species (ROS) and decreases glutathione (GSH) levels in E. coli, resulting in lipid peroxidation and DNA damage. H2S also inhibits the antioxidative enzyme activities of superoxide dismutase (SOD), catalase (CAT) and glutathione reductase (GR) and induces the response of the SoxRS and OxyR regulons in E. coli. Moreover, pretreatment with the antioxidant ascorbic acid (AsA) could effectively prevent H2S-induced toxicity in E. coli. Taken together, our results indicate that H2S exhibits an antibacterial effect on E. coli through oxidative damage and suggest a possible application for H2S in water and food processing. 相似文献
11.
Background
Hydrogen sulfide (H2S), the third physiologically relevant gaseous molecule, is recognized increasingly as an anti-inflammatory mediator in various inflammatory conditions. Herein, we explored the effects and mechanisms of sodium hydrosulfide (NaHS, a H2S donor) on tumor necrosis factor (TNF)-α-induced human umbilical vein endothelial cells (HUVEC) dysfunction.Methodology and Principal Findings
Application of NaHS concentration-dependently suppressed TNF-α-induced mRNA and proteins expressions of intercellular adhesion molecule-1 (ICAM-1) and vascular cell adhesion molecule-1 (VCAM-1), mRNA expression of P-selectin and E-selectin as well as U937 monocytes adhesion to HUVEC. Western blot analysis revealed that the expression of the cytoprotective enzyme, heme oxygenase-1 (HO-1), was induced and coincident with the anti-inflammatory action of NaHS. Furthermore, TNF-α-induced NF-κB activation assessed by IκBα degradation and p65 phosphorylation and nuclear translocation and ROS production were diminished in cells subjected to treatment with NaHS.Significance
H2S can exert an anti-inflammatory effect in endothelial cells through a mechanism that involves the up-regulation of HO-1. 相似文献12.
Hydrogen sulfide alleviated chromium toxicity in wheat 总被引:7,自引:0,他引:7
Effects of H2S on seed germination under chromium (Cr) stress were investigated in wheat (Triticum aestivum L.). Under Cr stress, the percentage of germination of wheat seeds decreased, but this decrease could be alleviated by pretreatment
with NaHS, an H2S donor, in a dose-dependent manner. Furthermore, NaHS significantly enhanced the activities of amylase, esterase, superoxide
dismutase, catalase, ascorbate peroxidase, and guaiacol peroxidase in Cr-stressed germinating seeds, whereas reduced the Cr-induced
increase in lipoxygenase activity and over-production of malondialdehyde (MDA) and H2O2, and sustained slightly higher content of endogenous H2S. 相似文献
13.
Key message
NO generation is studied in the protoplast chloroplasts. NO, ONOO ? and ROS (O 2 ? and H 2 O 2 ) are generated in chloroplasts. Nitric oxide synthase-like protein appears to be involved in NO generation.Abstract
Nitric oxide stimulates chlorophyll biosynthesis and chloroplast differentiation. The present study was conducted to better understand the process of NO generation in the leaf chloroplasts and protoplasts. NO, peroxynitrite and superoxide anion were investigated in the protoplasts and isolated chloroplasts using specific dyes, confocal laser scanning and light microscopy. The level of NO was highest after protoplast isolation and subsequently decreased during culture. Suppression of NO signal in the presence of PTIO, suggests that diaminofluorescein-2 diacetate (DAF-2DA) detected NO. Detection of peroxynitrite, a reaction product of NO and superoxide anion, further suggests NO generation. Moreover, generation of NO and peroxynitrite in the chloroplasts of wild-type Arabidopsis and their absence or weak signals in the leaf-derived protoplasts of Atnoa1 mutants confirmed the reactivity of DAF-2DA and aminophenyl fluorescein to NO and peroxynitrite, respectively. Isolated chloroplasts also showed signal of NO. Suppression of NO signal in the presence of 100 μM nitric oxide synthase inhibitors [l-NNA, Nω-nitro-l-arginine and PBIT, S,S′-1,3-phenylene-bis(1,2-ethanediyl)-bis-isothiourea] revealed that nitric oxide synthase-like system is involved in NO synthesis. Suppression of NO signal in the protoplasts isolated in the presence of cycloheximide suggests de novo synthesis of NO generating protein during the process of protoplast isolation. Furthermore, the lack of inhibition of NO production by sodium tungstate (250 μM) and inhibition by l-NNA, and PBIT suggest involvement NOS-like protein, but not nitrate reductase, in NO generation in the leaf chloroplasts and protoplasts. 相似文献14.
H. Zhang M. J. Wang L. Y. Hu S. H. Wang K. D. Hu L. J. Bao J. P. Luo 《Russian Journal of Plant Physiology》2010,57(4):532-539
Effects of NaHS, H2S donor, on germination and antioxidant metabolism in wheat (Triticum aestivum L.) seeds under osmotic stress were investigated. With the enhancement of osmotic stress, which was mimicked by PEG-6000,
the seed germination dropped gradually. NaHS treatment could promote wheat seed germination against osmotic stress in a dose-dependent
manner; while Na+ and other sulfur-containing components, such as S2−, SO42−, SO32−, HSO4− and HSO3−, were not able to improve seed germination as NaHS did, confirming H2S or HS− derived from NaHS contribute to the protective roles. Further experiments showed that NaHS treatment combined with PEG enhanced
the activities of amylase and esterase in comparison to PEG treatment alone. Alternatively, NaHS treatment significantly reduced
malondialdehyde and hydrogen peroxide accumulation in seeds. Significant enhancement of catalase and ascorbate peroxidase
activities and decrease in lipoxygenase activity were observed in NaHS treated seeds, while peroxidase and superoxide dismutase
activities were not affected as compared with the control. Furthermore, the H2S donor treatment could retain higher levels of endogenous H2S in wheat seeds under osmotic stress. These data indicated that H2S played a protective role in wheat seed against osmotic stress. 相似文献
15.
Lisha Chen Xiaoyan Liu Xinying Zhang Shanshan Liu Jing Wei Gang Xu 《Plant and Soil》2013,368(1-2):355-363
Aims
Responses of typical wetland plant Acorus tatarinowii to diesel stress were investigated to provide basis of ecological monitoring system and phytoremediation for diesel-contaminated wetland.Methods
Greenhouse experiments were established to determine the germinability of seedlings, hydrogen peroxide in leaves, and DNA damage in roots exposed to a range of potentially phytotoxic diesel.Results
The presence of diesel did not benefit the growth of A. tatarinowii. The germination ratio and germination rate decreased with the increase of diesel concentration, both the lowest value appeared when the concentration of diesel was 10,000 mg?kg?1. The lowest diesel concentration (2,000 mg?kg?1) in the soil significantly reduced the length, average diameter, and projected area of root, especially on the stress of the higher diesel concentration (4,000, 8,000, and 10,000 mg?kg?1). Furthermore, H2O2 concentration in leaves rose with the increasing concentration of diesel. However, no DNA oxidative damage to root was observed in our experiment.Conclusions
Diesel exposure significantly inhabited the seed germination, root elongation, and seedlings growth of A. tatarinowii. Diesel stress caused the accumulation of H2O2 in the leaves of A. tatarinowii. 相似文献16.
Chunping Zhang Ping He Yicun Li Yan Li Huankai Yao Jingyu Duan Shijun Hu Hui Zhou Shuo Li 《Journal of Plant Growth Regulation》2016,35(2):330-344
The purpose of the present study was to investigate the mechanism of DA-6 in alleviating the salinity inhibition of Cassia obtusifolia L. seeds and seedlings. NaCl (100 mM) was used to mimic salinity stress in a series of experiments. Varying combinations of DA-6 were added to seeds and seedlings under salinity stress. Seed germination indices and seedling parameters were investigated. Seed germination and seedling growth were significantly inhibited under salinity stress. NaCl-induced inhibitory effects on seed germination and seedling growth were ameliorated by DA-6 with different concentrations. Addition of DA-6 to seeds (50 µM) and seedlings (100 µM) significantly alleviated damage to the plant cells under salinity stress. DA-6 (regardless of the presence or absence of NaCl) enhanced chlorophyll concentration, total soluble sugars, free proline, and soluble protein, and improved photosystem II (PSII) photochemical efficiency levels (F v/F m), PSII actual photochemical efficiency (ΦPSII), and the photochemical quench coefficient. In contrast, the initial fluorescence (F o) and the non-photochemical quenching coefficient decreased. Application of DA-6 also enhanced the activities of superoxide dismutase (SOD; EC 1.15.1.1), peroxidase (POD; EC 1.11.1.7), catalase (CAT; EC 1.11.1.6), ascorbate peroxidase (APX; EC 1.11.1.11), and glutathione reductase (GR; EC 1.6.4.2), thus alleviating oxidative damage, as indicated by decreases in thiobarbituric acid-reactive substances, hydrogen peroxide concentration (H2O2), relative conductivity, and lipoxygenase activity (LOX; EC 1.13.11.12). Based on the experimental results, we conclude that DA-6 induces advantageous effects on the attenuation of salt-stress inhibition of C. obtusifolia seeds and seedlings and alleviates oxidative damage by conferring beneficial cytoprotection and activating antioxidant enzymes. DA-6 can be used as an effective plant growth regulator to alleviate salinity stress. 相似文献
17.
18.
Zhong-Guang Li Wei-Biao Long Shi-Zhong Yang Yang-Cai Wang Ji-Hong Tang 《Acta Physiologiae Plantarum》2018,40(4):76
Methylglyoxal (MG) was traditionally viewed as toxic by-product of glycolysis and photosynthesis in plants, but now is emerging as a signaling molecule, which, similar to hydrogen sulfide (H2S), participates in regulating seed germination, growth, development, and response to abiotic stress. However, whether exists an mutual effect between MG and H2S in improving thermotolerance in plants is not found to be reported. In this paper, interplay between MG and H2S in the formation of thermotolerance in maize seedlings was investigated. The results indicated that MG pretreatment elevated the survival percentage of maize seedlings under high-temperature stress, manifesting that MG could boost the thermotolerance of maize seedlings. Interestingly, MG-induced thermotolerance was reinforced by sodium hydrosulphide (NaHS, H2S donor), while impaired by dl-propargylglycine (inhibitor of H2S biosynthesis) and hypotaurine (scavenger of H2S), respectively. In addition, H2S could induce the thermotolerance of maize seedlings, which was impaired by aminoguanidine (AG) and N-acetyl-l-cysteine (NAC) (MG scavengers), respectively. Furthermore, MG stimulated the activity of a key enzyme in H2S biosynthesis, l-cysteine desulfhydrase, which, in turn, triggered the elevation of endogenous H2S in maize seedlings. In addition, H2S increased the level of endogenous MG; this increase was crippled by AG and NAC. This paper, for the first time, reported that MG could improve the thermotolerance of maize seedlings, and its acquisition was, at least partly, mediated by H2S. 相似文献
19.
Nitric oxide contributes to copper tolerance by influencing ROS metabolism in Arabidopsis 总被引:1,自引:0,他引:1
Andrea Pető Nóra Lehotai Gábor Feigl Nóra Tugyi Attila Ördög Katalin Gémes Irma Tari László Erdei Zsuzsanna Kolbert 《Plant cell reports》2013,32(12):1913-1923
Key message
Nitric oxide improves copper tolerance via modulation of superoxide and hydrogen peroxide levels. This reflects the necessity of a well-coordinated interplay between NO and ROS during stress tolerance.Abstract
Copper (Cu) excess causes toxicity and one probable consequence of this is the disturbance of cell redox state maintenance, inter alia, by reactive oxygen- (ROS) and nitrogen species (RNS). The objective of this paper was to examine the role of nitric oxide (NO) in Cu stress tolerance and its relationship with ROS in Arabidopsis. In agar-grown seedlings, concentration-dependent Cu accumulation was observed. The 5 μM Cu resulted in reduced cell viability in the NO overproducing nox1 and gsnor1-3 root tips compared to the wild-type (WT). In contrast, 25 and 50 μM Cu caused higher viability in these mutants, while in the NO-lacking nia1nia2 lower viability was detected than in the WT. The exogenous NO donor enhanced cell viability and scavenging endogenous NO decreased it in Cu-exposed WT seedlings. Besides, SNP in nia1nia2 roots led to the improvement of viability. The ascorbic acid-deficient mutants (vtc2-1, vtc2-3) possessing slightly elevated ROS levels proved to be Cu sensitive, while miox4 showing decreased ROS production was more tolerant to Cu than the WT. In nox1 and gsnor1-3, Cu did not induce superoxide formation, and H2O2 accumulation occurred only in the case of NO deficiency. Based on these, under mild stress NO intensifies cell injury, while in the case of severe Cu excess it contributes to better viability. ROS were found to be responsible for aggravation of Cu-induced damage. NO alleviates acute Cu stress via modulation of O 2 ·? and H2O2 levels reflecting the necessity of a well-coordinated interplay between NO and ROS during stress tolerance. 相似文献20.
Tan G Pan S Li J Dong X Kang K Zhao M Jiang X Kanwar JR Qiao H Jiang H Sun X 《PloS one》2011,6(10):e25943