Photosynthetic activities of Pisum sativum seedlings grown in presence of cadmium

Chugh, L.K.; Sawhney, S.

doi:10.1016/s0981-9428(99)80028-x

Cited by 165 publications

(80 citation statements)

References 25 publications

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“…Reduced total chlorophyll content in metal-treated plants was found by others researchers (Ouzounidou et al 1997;Cargnelutti et al 2006;Chugh & Sawhney 1999;Hegedüs et al 2001;Singh et al 2006), but in disagreement with the result found in this work, Mishra et al (2006) showed that percentage decrease was higher for chlorophyll a as compared to chlorophyll b in Bacopa monnieri exposed to Cd. The reduction in chlorophyll content according to Singh et al (2006) would diminish the efficiency of the photosynthetic apparatus to harvest light by interfering with the activities of PS I and PS II, so Cd would hamper the operation of photochemical reactions.…”

Section: Discussioncontrasting

confidence: 92%

Photosynthetic pigments content, δ-aminolevulinic acid dehydratase and acid phosphatase activities and mineral nutrients concentration in cadmium-exposed Cucumis sativus L.

et al. 2009

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In this study, the effects of cadmium chloride (CdCl2) on plant growth, histology of roots, photosynthetic pigments content, δ-aminolevulinic acid dehydratase (ALA-D; E.C. 4.2.1.24) and acid phosphatase activities (AP; E.C. 3.1.3.2), soluble phosphorus (Pi) measurement and mineral nutrients content in cucumber seedlings (Cucumis sativus L.) were investigated. Cucumber seedlings were grown in vitro in an agar-solidified substrate containing four CdCl2 treatments (0, 100, 400, and 1000 µM) for ten days. Cd was readily absorbed by seedlings and its content was greater in the roots than in the shoot. Cd reduced shoot and root length, and fresh and dry biomass of seedlings. Inhibition of root cell elongation in Cd-treated seedlings was observed by the increase of the mean radial size of cells belonging to three zones of the root tip. The highest level of Cd reduced in a similar manner chlorophyll a, chlorophyll b and total chlorophyll contents. Increasing concentrations of Cd resulted in a linear decrease in carotenoids levels of cotyledons. Interestingly, the ALA-D activity in cotyledons was inhibited only at the highest level of Cd. Root and shoot AP activities were, respectively, activated and inhibited at all CdCl2 concentrations. Root Pi concentration was increased in all Cd treatments and it was not altered in the shoot tissues. Moreover, in general, the nutrient contents were increased in the root and decreased in the shoot. Therefore, we suggest that Cd affects negatively growth, photosynthetic pigments, ALA-D and AP activities and partition of mineral nutrients in cucumber seedlings.

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Section: Discussioncontrasting

confidence: 92%

Photosynthetic pigments content, δ-aminolevulinic acid dehydratase and acid phosphatase activities and mineral nutrients concentration in cadmium-exposed Cucumis sativus L.

et al. 2009

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“…Ao final do período experimental, as folhas apresentavam cloroses internervais, necrose, crescimento reduzido e lâmina foliar menos flexível. Redução nos teores de clorofila tem sido relatada por vários autores como respostas de plantas ao estresse por metais pesados (Horváth et al 1996, Chugh et al 1999, Di Cagno et al 1999. Segundo Stobart et al (1985), os metais pesados interferem na biossíntese da clorofila através da inibição da formação do ácido -aminolevulínico (ALA), e também da inibição da redutase do protoclorofilídio, a enzima chave da fototransformação do protoclorofilídio-clorofílidio, o que pode resultar em cloroses, afetar a capacidade de assimilação de CO 2 , e portanto, o crescimento.…”

Section: Resultsunclassified

Efeitos dos rejeitos da indústria de zinco na anatomia e crescimento de plantas jovens de Salix humboldtiana Willd: (salgueiro)

Gomes

Marques

Nogueira

et al. 2011

Hoehnea

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-(Effects of tailings from zinc industry in the anatomy and growth of young plants of Salix humboldtiana Willd. (willow)). The heavy metal pollution caused mainly by mining and industrial activities requires studies for the recovery of contaminated areas. Thus, we studied growth and anatomical characteristics responses of young willow plants grown in heavy metal multicontaminated soil. Plants were grown in three mixture levels of contaminated soil: 0%, 15% and 30% (v/v) for 60 days. At the highest level of contamination was noted a less dry matter production of roots and shoots and reduced root growth. Accordingly, the roots exhibited epidermis, exodermis and endodermis thicker, and a smaller number of conducting elements of xylem. Leaves showed changes in the number of conducting elements of xylem diameter and density of stomata, and epidermis, endodermis, collenchyma and mesophyll cell thickness. Key words: anatomic plasticity, growing, tolerance, willow RESUMO -(Efeitos dos rejeitos da indústria de zinco na anatomia e crescimento de plantas jovens de Salix humboldtiana Willd. (salgueiro)). A poluição por metais pesados, gerada principalmente pelas atividades de mineração e industrial, exige estudos que possibilitem a recuperação de áreas contaminadas. Foram estudadas respostas de crescimento e características anatômicas de plantas jovens de salgueiro cultivadas em solo multicontaminado por metais pesados. As plantas foram cultivadas em três níveis de misturas de solo contaminado: 0%; 15% e 30% (v/v), durante 60 dias. No maior nível de contaminação foi observado menor produção de matéria seca das raízes e da parte aérea e menor crescimento das raízes. Nesta condição, as raízes apresentaram maior espessura da epiderme, exoderme e endoderme e menor número de elementos condutores de xilema. As folhas apresentaram modificações no número de elementos condutores de xilema, na densidade e diâmetro dos estômatos, e na espessura da epiderme, endoderme, colênquima e do mesofilo. Palavras-chave: crescimento, plasticidade anatômica, salgueiro, tolerância IntroduçãoA poluição por metais pesados representa, hoje, uma importante forma de estresse para a comunidade vegetal devido à progressiva adição destes metais ao ambiente pelas atividades humanas. Esses metais, como o Zn, Cd, As, Ag, Mn, são particularmente difíceis de serem retirados do solo, água ou ar, pois, diferentemente dos poluentes orgânicos que podem ser degradados a compostos não-tóxicos, são imutáveis pelas reações bioquímicas (Meagher & Heaton 2005).As plantas apresentam várias propriedades naturais que podem ser utilizadas como perspectivas para a absorção de poluentes do ambiente. Vários estudos têm demonstrado o potencial das plantas para a remediação de áreas degradas por metais pesados (Marques et al. 2000, Lux et al. 2004, Vollenweider et al. 2006, cuja técnica é conhecida como fitorremediação.No vegetal, os metais pesados desencadeiam respostas fisiológicas e alterações em níveis estruturais e ultraestruturais, como a danificação de lipídeos de...

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“…The alleviation of Cd toxicity by Ca may be due to the fact that plasma membrane surfaces are usually negatively charged, and high concentrations of Ca 2+ would tend to neutralize them and thus minimize the toxic effect of Cd; likewise, high Ca concentrations near ion channels might decrease the influx of Cd (Sarwar et al 2010). Heavy metals are known to interfere in chlorophyll biosynthesis (Cagno et al 1999;Chugh & Sawhney 1999;Horváth et al 1996), and as magnesium serves as the central atom of the chlorophyll molecule and as a co-factor in many enzymes activating phosphorylation processes (Tu & Ma 2005), maintenance of uptake and Mg transport to shoots may help ensure the maintenance of chlorophyll biosynthesis and avoid further damage to the photosynthetic system.…”

Section: Macronutrient Contentsmentioning

confidence: 99%

Cadmium effects on mineral nutrition of the Cd-hyperaccumulator Pfaffia glomerata

2013

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A plant's ability to survive in a stressful environment is correlated with its nutritional status, which can be affected by cadmium (Cd) uptake. The present study evaluated the influence of Cd on the concentrations and distributions of nutrients in the roots and shoots of the Cd-hyperaccumulator Pfaffia glomerata (Sprengel) Pedersen. Plantlets were cultivated in nutrient solutions containing increasing Cd concentrations during 20 days under greenhouse conditions, and the concentrations of Cd and essential macro-(N, P, K, Ca, Mg and S) and micro-(Zn, Fe, Mn, Cu) elements in the roots and shoots were subsequently determined. Cd did not affect the plant biomass production. Cd accumulation was found to be higher in roots than in shoots, and influenced the distribution of macro and micro elements in those plants. Despite the high phytotoxicity of this element, our results indicated the existence of Cd-tolerance mechanisms in both nutrient uptake and distribution processes that enabled these plants to survive in Cd-contaminated sites.

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Photosynthetic activities of Pisum sativum seedlings grown in presence of cadmium

Cited by 165 publications

References 25 publications

Photosynthetic pigments content, δ-aminolevulinic acid dehydratase and acid phosphatase activities and mineral nutrients concentration in cadmium-exposed Cucumis sativus L.

Photosynthetic pigments content, δ-aminolevulinic acid dehydratase and acid phosphatase activities and mineral nutrients concentration in cadmium-exposed Cucumis sativus L.

Efeitos dos rejeitos da indústria de zinco na anatomia e crescimento de plantas jovens de Salix humboldtiana Willd: (salgueiro)

Cadmium effects on mineral nutrition of the Cd-hyperaccumulator Pfaffia glomerata

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