Effect of heavy metal ion excess on sunflower leaves: evidence for involvement of oxidative stress

Gallego, Susana M.; Benavides, María Patricia; Tomaro, Marı́a L.

doi:10.1016/s0168-9452(96)04528-1

Cited by 602 publications

(319 citation statements)

References 34 publications

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“…Cadmium is also responsible for absorption sites in the plasma membrane with Fe, causing Fe deficiency symptoms (Gallego et al, 1996;Siedlecka & Krupa, 1999; Astolfi et al, 2012). High Mn concentrations may reduce Fe absorption and induce deficiency.…”

Section: Resultsmentioning

confidence: 99%

Heavy metal toxicity in rice and soybean plants cultivated in contaminated soil

2014

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RESUMO Toxicidade por metais pesados em plantas de arroz e soja cultivados em solo contaminadoOs metais pesados podem-se acumular no solo, causando fitotoxicidade em plantas, apresentando alguns sintomas específicos. Por esta razão, este estudo avaliou os sintomas específicos, em plantas de arroz e de soja, causados por excesso de metais pesados no solo. As plantas de arroz e de soja foram cultivadas em vasos, contendo solos com diferentes quantidades de metais pesados. O delineamento experimental foi inteiramente casualizado, com quatro repetições, utilizando-se duas culturas e sete amostras de solos com diferentes níveis de contaminação. As plantas de arroz e de soja exibiram diferentes respostas às elevadas concentrações desses metais no solo. Por exemplo, altas concentrações de Zn disponível no solo causaram fitotoxicidade no arroz e na soja, principalmente cloroses e inibição do crescimento das plantas. As plantas de arroz acumularam maiores teores de Cu, Mn, Pb e Zn e foram mais sensíveis às concentrações elevadas desses elementos no solo, absorvendo-os mais facilmente do que as plantas de soja. Além disso, altas concentrações de Zn no solo reduziram a concentração de Fe na parte aérea das plantas de soja e de arroz para níveis considerados deficientes.Palavras-chave: contaminação, nutrição de plantas, sintomatologia, metal pesado, Oriza sativa L., Glycine max L.1 Engenheira-Agrônoma. Departamento de Agronomia, Universidade Estadual do Centro-Oeste, Rua Simeão Camargo Varela de Sá, 3, Vila Carli, 85040-080, Guarapuava, Paraná, Brasil. mlsousi@hotmail.com (autora para correspondência). 2 Engenheiro-Agrônomo. Departamento de Ciência do Solo, Escola Superior de Agricultura "Luiz de Queiroz", Avenida Pádua Dias, 11, Caixa Postal 09, 13418-900, Piracicaba, São Paulo, Brasil. gcvitti@usp.br 3 Químico. Departamento de Agronomia, Universidade Estadual do Centro-Oeste, Rua Simeão Camargo Varela de Sá, 3, Vila Carli, Guarapuava, Paraná, Brasil. aanrt@hotmail.com Heavy metal toxicity in rice and soybean plants cultivated in contaminated soilHeavy metals can accumulate in soil and cause phytotoxicity in plants with some specific symptoms. The present study evaluated the specific symptoms on rice and soybeans plants caused by excess of heavy metals in soil. Rice and soybean were grown in pots containing soil with different levels of heavy metals. A completely randomized design was used, with four replications, using two crop species and seven sample soils with different contamination levels. Rice and soybean exhibited different responses to the high concentrations of heavy metals in the soil. Rice plants accumulated higher Cu, Mn, Pb and Zn concentrations and were more sensitive to high concentrations of these elements in the soil, absorbing them more easily compared to the soybean plants. However, high available Zn concentrations in the soil caused phytotoxicity symptoms in rice and soybean, mainly chlorosis and inhibited plant growth. Further, high Zn concentrations in the soil reduced the Fe concentrat...

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Section: Resultsmentioning

confidence: 99%

Heavy metal toxicity in rice and soybean plants cultivated in contaminated soil

2014

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“…Cadmium is believed to result in lipid peroxidation (Gallego et al 1996) as well as disrupting photosynthesis leading to ROS generation (Prasad 1995). Consequently, Pilon-Smits et al (2000) demonstrated improved Cd tolerance in Brassica juncea plants with elevated GR targeted to the chloroplasts.…”

Section: Discussionmentioning

confidence: 99%

Modification of reactive oxygen species scavenging capacity of chloroplasts through plastid transformation

et al. 2011

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Reactive oxygen species (ROS), including superoxide anions, hydrogen peroxide and hydroxyl radicals are generated through normal biochemical processes, but their production is increased by abiotic stresses. The prospects for enhancing ROS scavenging, and hence stress tolerance, by direct gene expression in a vulnerable cell compartment, the chloroplast, have been explored in tobacco. Several plastid transformants were generated which contained either a Nicotiana mitochondrial superoxide dismutase (MnSOD) or an Escherichia coli glutathione reductase (gor) gene. MnSOD lines had a three-fold increase in MnSOD activity, but interestingly a five to nine-fold increase in total chloroplast SOD activity. Gor transgenic lines had up to 6 times higher GR activity and up to 8 times total glutathione levels compared to wild type tobacco. Photosynthetic capacity of transplastomic plants, as measured by chlorophyll content and variable fluorescence of PSII was equivalent to non-transformed plants.The response of these transplastomic lines to several applied stresses was examined. In a number of cases improved stress tolerance was observed. Examples include enhanced methyl viologen (Paraquat)-induced oxidative stress tolerance in Mn-superoxidase dismutase overexpressing plants, improved heavy metal tolerance in glutathione reductase expressing lines, and improved tolerance to UV-B radiation in both sets of plants.

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“…However, when plants are exposed to stress over an extended period of time, they accumulate more ROS than they eliminate. As soon as the balance is broken, the overaccumulation of ROS in plants leads to significant damage to the membrane system of plants from a lipid peroxidation reaction, which can increase permeability and conductivity (Gallego et al 1996;Chaoui et al 1997;Kaya et al 2013). Although plant growth, chlorophyll content, stomata opening, transpiration, and photosynthesis have been reported to be inhibited by Cd in nutrient solutions (Jiang & Li 1992;Baryla et al 2001;Drążiewicz & Baszyński 2005;Sun et al 2005), there have also been reports that Cd treatments had no effect on photosynthesis or growth (Greger & Lindberg 1986;Haag-Kerwer et al 1999;Li et al 2005;Zhou & Qiu 2005), and that N was possibly a bioactive signaling molecule in plant responses to heavy metal stress (Hassan et al 2005;Floryszak-Wieczorek et al 2006;Grün et al 2006;Arasimowicz & Floryszak-Wieczorek 2007).…”

Section: Introductionmentioning

confidence: 99%

Effects of nitrogen on the activity of antioxidant enzymes and gene expression in leaves of Populus plants subjected to cadmium stress

Zhang

Wan

Zheng

et al. 2014

Journal of Plant Interactions

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The research aimed to verify the important physiological effect of nitrogen (N) on plants exposed to cadmium (Cd). The poplar plants were grown in a Hoagland nutrient solution and treated with extra N, Cd, and N + Cd. After treatment, plant growth and chlorophyll content were recorded. The oxidative stress, the activity of antioxidant enzymes, and the expression of related genes were also examined. The results indicated the plants treated with sole Cd presented obvious toxicity symptoms, i.e. growth inhibition, reactive oxygen species accumulation, and chlorophyll content decrement. However, when N was added to the plants under Cd stress, plant growth was enhanced, chlorophyll synthesis was promoted, and the oxidative stress was alleviated. Further, the expression of antioxidant enzymes genes was upregulated by N. The results indicated that N partially reversed the toxic effect of Cd on poplar plants, which can provide new methodology to enhance the phytoremediation technology for heavy metal pollution soil.

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Effect of heavy metal ion excess on sunflower leaves: evidence for involvement of oxidative stress

Cited by 602 publications

References 34 publications

Heavy metal toxicity in rice and soybean plants cultivated in contaminated soil

Heavy metal toxicity in rice and soybean plants cultivated in contaminated soil

Modification of reactive oxygen species scavenging capacity of chloroplasts through plastid transformation

Effects of nitrogen on the activity of antioxidant enzymes and gene expression in leaves of Populus plants subjected to cadmium stress

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