Inactivation of chloroplast photosynthetic electron-transport activity by Ni2+

Tripathy, Baishnab C.; Bhatia, B.; Mohanty, Prasanna

doi:10.1016/0005-2728(81)90230-9

Cited by 74 publications

(36 citation statements)

References 14 publications

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“…Adding a saturating concentration of DPC, NH2OH and MnCl2 restored the Agtinduced inhibition of PS II (DCPIP photoreduction and Chl a fluorescence) but failed to do so for the Nittinduced inhibition. This indicates that Ag+ inhibits electron transport at the oxidizing side of PS II, and Ni2+ either destroys the photosynthetic membranes or inactivates the PS II reaction center, as reported for Ni2+ and Co2+ in barley chloroplasts (19,20). There is every likelihood that Ni2+ like Cu2+ also tends to acquire or donate electrons and reacts with oxygen to produce free radicals such as superoxide and hydroxyl and thus may cause peroxidative degradation of membrane lipids and chlorophyll, as is known for Cu in spinach chloroplasts (15) and Scenedesmus (16).…”

Section: And Discussionsupporting

confidence: 65%

“…37 the electrons at multiple sites of the electron transport chain (7,8 ). Heavy metals damage to light-harvesting pigments has also been reported (19), as well as changes in energy transfer systems within the pigments due especially to the quenching of the chlorophyll fluorescence yield in isolated chloroplasts. The effects of Ag+ and Ni2+ on the growth, '4C-uptake, nitrogenase, glutamine synthetase and nitrate reductase of Nostoc muscorum have also been studied (14).…”

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confidence: 98%

“…The effects of Hg2+, Cd2+, Zn2+ and Ni2+ on the electron transport of isolated chloroplasts to ascertain the modes of action of these cations on the photosynthesis have been documented (3,7,18,19). These studies indicate that the metal ions specifically affect the carriers and reaction centers thereby interrupting the flow of…”

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confidence: 99%

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Inhibition of photosynthetic electron transport in Nostoc muscorum by Ni2+ and Ag+.

Singh¹,

Prasad²,

C.³

1991

J. Gen. Appl. Microbiol.

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This paper presents the inhibition of photosynthetic electron transport chain of Nostoc muscorum by divalent Ni2+ and monovalent Ag+. PS I (DCPIP/ASC-MV) and PS II (H20-*PBQ) activities were markedly inhibited by Ni2+ and Ag+ in a concentration-dependent fashion but PS II was more susceptible than PS I to Ni2+. Ago was more toxic to PS I than PS II. The greater sensitivity of PS II to Ni2+ was further confirmed by the inhibition of DCPIP photoreduction and Chl a fluorescence. Restoration of Agtinduced inhibition of DCPIP photoreduction and Chl a fluorescence by artificial electron donors (DPC, NH2OH, MnCl2) and their failure to restore Ni2t induced inhibition suggests that Ni24 inactivates PS II by causing alteration and destruction of photosynthetic membranes, but Ag+ inhibits the electron flow at the oxidizing side of PS II. Nevertheless, the suppression of the fluorescence intensity at low concentrations of both metal cations points to the involvement of phycobilisomes in the inhibition of PS II activity.Though a considerable amount of work has been done on the metabolic processes of algae (12,22), compared to higher plants, the photosynthetic system of algae and cyanobacteria as affected by heavy metals are least explored. Interest in work on metal toxicity in cyanobacteria stems from: (i) their prokaryotic nature but higher plant type photosynthesis, (ii) their role in the nitrogen economy of the biosphere, and (iii) the ease of experimentally manipulating them.The effects of Hg2+, Cd2+, Zn2+ and Ni2+ on the electron transport of isolated chloroplasts to ascertain the modes of action of these cations on the photosynthesis have been documented (3,7,18,19). These studies indicate that the metal ions specifically affect the carriers and reaction centers thereby interrupting the flow of

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Section: And Discussionsupporting

confidence: 65%

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confidence: 98%

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Inhibition of photosynthetic electron transport in Nostoc muscorum by Ni2+ and Ag+.

Singh¹,

Prasad²,

C.³

1991

J. Gen. Appl. Microbiol.

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“…1f; Tripathy et al 1981). The variety T-44 showed lower yield gap under stress conditions compared with PDM-139.…”

Section: Discussionmentioning

confidence: 94%

Brassinosteroid-mediated evaluation of antioxidant system and nitrogen metabolism in two contrasting cultivars of Vigna radiata under different levels of nickel

Yusuf

Fariduddin

Ahmad

et al. 2014

Physiol Mol Biol Plants

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The role of 28-homobrassinolide (HBL) in countering nickel-induced oxidative damage through overexpression of antioxidant enzymes and proline in Vigna radiata has been investigated. Two varieties of V. radiata, one sensitive to Ni (PDM-139) and the other tolerant to Ni (T-44), were sown in the soil fed with different levels (0, 50, 100 or 150 mg kg −1 ) of Ni, and at 29-day stage, foliage of plants was applied with deionized water (control), 10 −8 or 10 −6 M of HBL. The plants were sampled at 45-day stage of growth to assess various physiological as well as biochemical characteristics. The remaining plants were allowed to grow up to maturity to study the yield characteristics. The growth traits, leghemoglobin, nitrogen and carbohydrate content in the nodules, leaf chlorophyll content, photosynthesis efficiency, leaf water potential, activities of nitrate reductase, carbonic anhydrase and nitrogenase decreased proportionately with the increasing concentrations of nickel, whereas electrolyte leakage, various antioxidant enzymes viz. catalase, peroxidase and superoxide dismutase and accumulation of proline increased at 45-day stage. However, the exogenously applied HBL to the nickel-stressed or non-stressed plants improved growth, nodulation and photosynthesis and further enhanced the various antioxidant enzymes viz. catalase, peroxidase and superoxide dismutase and accumulation of proline. The deleterious impact of Ni on the plants was concentration dependent where HBL applied to the foliage induced overexpression of antioxidant enzyme and accumulation of proline (osmolyte) which could have conferred tolerance to Ni up to 100 mg kg −1 , resulting in improved growth, nodulation, photosynthesis and yield attributes.

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“…Two of the essential processes affected are photosynthesis and transpiration, with both the light and dark reactions of photosynthesis being affected (Bazzaz, Carlson & Rolfe, 1974;Carlson, Bazzaz & Rolfe, 1975;Veeranjaneyulu& Das, 1982 ;Morgutti, Sacchi & Cocucci, 1984). Nickel exposure can reduce concentrations of chlorophyll a and b, cytochrome Ag and b^^g, and ferrodoxin, as well as affecting the emission spectrum of chlorophyll a (Tripathy, Bhatia & Mohanty, 1981 ;Veeranjaneyulu & Das, 1982). Reduced phosphoenolpyruvate carhoxylase activity has been reported in Ni-treated maize (Morgutti et al, 1984), while in sunflower reduced photosynthesis was postulated to be due to an inhibition of stomatal opening (Carlson et al, 1975).…”

Section: Introuiictionmentioning

confidence: 99%

Nickel toxicity in mycorrhizal birch seedlings infected with Lactarius rufus or Scleroderma flavidum I. Effects on growth, photosynthesis, respiration and transpiration

Jones

Hutchinson

1988

New Phytologist

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SUMMARYGrowtb, pbotosyntbesis, transpiration and respiration were measured in bircb (Betula papvrifera Marsb.) seedlings exposed to 85//M nickel. Tbe seedlings were inoculated with either Sclerodertna flavidum E. & E., a fungus known from previous work to increase Ni tolerance, or Lactarius rufus (Scop, ex Fr.) Fr., another mycorrbizal associate, but one wbicb did not increase Ni tolerance, or else tbey were not inoculated. Decreased water uptake per seedling was used as an indicator of tbe progression of Ni toxicity in tbe seedlings over 16 weeks. These measurements indicated tbat L. rufus provided some initial protection against Ni toxicity. However, water uptake in S.fiavidum-m^itcied seedlings was least affected by Ni, and was significantly bigber tban tbat in L' rufusintected and uninoculated seedlings after week 10. Total dry weigbts of tbe S. flavidimt-miecXed seedlings were bigber tban tbose of otber seedlings at weeks 12 and 21. Cbitin analysis was used to determine tbe fungal component of root weigbt. Tbe weigbt of S.flavidutti tissue per root was significantly greater tban tbat of L. rufus in botb tbe Ni-treated and control (non-Ni-treated) seedlings, and tbis ar.-iount increased witb time. Lactarius rufus did not grow once tbe roots were expo.sed to Ni. Tbus, tbe ability of S. flavidum to continue to grow following Nl exposure may be an important cbaracteristic distinguisbing between fungi wbicb are ' efTective' or ' ineffective' in enbancing metal tolerance. Nickel reduced pbotosyntbetic rates in seedlings infected witb S. flavidum relative to S. i?at;rA/m-infected seedlings not treated witb Ni, but did not bave tbis effect in uninoculated seedlings. Respiration rates were not affected by metal treatment, or by mycorrbizal formation. Tbus, 6\ flavidum increased Ni tolerance in tbe bost, but not by preventing Ni-induced reductions in pbotosyntbetic rates or by affecting sboot respiration rates.

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Inactivation of chloroplast photosynthetic electron-transport activity by Ni2+

Cited by 74 publications

References 14 publications

Inhibition of photosynthetic electron transport in Nostoc muscorum by Ni2+ and Ag+.

Inhibition of photosynthetic electron transport in Nostoc muscorum by Ni2+ and Ag+.

Brassinosteroid-mediated evaluation of antioxidant system and nitrogen metabolism in two contrasting cultivars of Vigna radiata under different levels of nickel

Nickel toxicity in mycorrhizal birch seedlings infected with Lactarius rufus or Scleroderma flavidum I. Effects on growth, photosynthesis, respiration and transpiration

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