Arsenic accumulation in Brassicaceae seedlings and its effects on growth and plant anatomy

Freitas-Silva, Larisse de; Araújo, Talita Oliveira de; Silva, Luzimar Campos da; Oliveira, José Tarcísio da Silva; Araújo, J. M. de

doi:10.1016/j.ecoenv.2015.09.028

Cited by 52 publications

(14 citation statements)

References 58 publications

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“…As a chemical analog of phosphate, arsenate is easily absorbed by the plant through high-affinity phosphate transporters located in the roots (Castrillo et al, 2013). Once absorbed, the pollutant triggers serious changes in the plant metabolism, affecting both the physiological and the biochemical processes, which may reveal alterations in morphology and in the plant cell organization (de Freitas-Silva et al, 2016). …”

Section: Introductionmentioning

confidence: 99%

The Involvement of Nitric Oxide in Integration of Plant Physiological and Ultrastructural Adjustments in Response to Arsenic

et al. 2017

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High arsenic (As) concentrations are toxic to all the living organisms and the cellular response to this metalloid requires the involvement of cell signaling agents, such as nitric oxide (NO). The As toxicity and NO signaling were analyzed in Pistia stratiotes leaves. Plants were exposed to four treatments, for 24 h: control; SNP [sodium nitroprusside (NO donor); 0.1 mg L-1]; As (1.5 mg L-1) and As + SNP (1.5 and 0.1 mg L-1, respectively). The absorption of As increased the concentration of reactive oxygen species and triggered changes in the primary metabolism of the plants. While photosynthesis and photorespiration showed sharp decrease, the respiration process increased, probably due to chemical similarity between arsenate and phosphate, which compromised the energy status of the cell. These harmful effects were reflected in the cellular structure of P. stratiotes, leading to the disruption of the cells and a possible programmed cell death. The damages were attenuated by NO, which was able to integrate central plant physiological processes, with increases in non-photochemical quenching and respiration rates, while the photorespiration level decreased. The increase in respiratory rates was essential to achieve cellular homeostasis by the generation of carbon skeletons and metabolic energy to support processes involved in responses to stress, as well to maintaining the structure of organelles and prevent cell death. Overall, our results provide an integrated view of plant metabolism in response to As, focusing on the central role of NO as a signaling agent able to change the whole plant physiology.

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Section: Introductionmentioning

confidence: 99%

The Involvement of Nitric Oxide in Integration of Plant Physiological and Ultrastructural Adjustments in Response to Arsenic

et al. 2017

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“…Phytoremediation is known to be an environment-friendly alternative clean-up method (Rungwa et al 2013). However, it requires hyperaccumulator plants such as Brassica (Irtelli and Navari-Izzo 2008;Srivastava et al 2009;Freitas-Silva et al 2016;Rahman et al 2016) and brake fern Pteris vittata (Ma et al 2001;Wang et al 2007;Sarangi and Chakrabarti 2008). The hyperaccumulator P. vittata can accumulate As to such a high level where other plants die (Gumaelius et al 2004), or Pteris vittata has developed such mechanisms that it avoids or excludes the metal (Zhu et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Root transcripts associated with arsenic accumulation in hyperaccumulator Pteris vittata

et al. 2018

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Hyperaccumulation of arsenic (As) by brake fern Pteris vittata has been described as an important genetic trait that provides an option for development of a sustainable phytoremediation process for As mitigation. Accumulation of very high concentration of arsenic in above-ground tissues may be the result of arsenic vacuole compartmentalization, but the mechanism(s) of arsenic uptake and transport by underground tissues are largely unknown. In this study, we made an attempt towards understanding the molecular mechanism of As hyperaccumulation in this plant. A time-dependent As accumulation study indicates an exponential accumulation of As from 7 to 30 days of arsenic exposure in fronds, and day 3-7 in roots. Root transcriptome analysis identified 554,973 transcripts. Further, subsets of 824 transcripts were differentially expressed between treated and control samples. Many of the genes of critical As-stress response, transcription factors and metal transporters, biosynthesis of chelating compounds involved in uptake and accumulation mechanisms were identified. The genes that were highly expressed such as cysteine-rich RLK, and ABC transporter G family member 26 needs further studies along with arsenite transmembrane transporter. The analysis of generated transcriptome dataset has provided valuable information and platform for further functional studies.

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“…The lower growth of plants can be considered an indicator of adaptive defense strategies, especially in situations of abiotic stresses (Freitas-Silva et al, 2016;Li et al, 2016). The variation in seedling growth, aerial part and root system denotes more or less adaptation to the environment (Mesquita et al, 2015).…”

Section: Resultsmentioning

confidence: 99%

Screening of spontaneous castor bean accesses for genetic improvement programs

Ferraz¹,

Batista²,

Barbosa³

et al. 2016

Afr. J. Biotechnol.

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The objective of this work was to identify, through the use of multivariate analysis, the spontaneous accesses of castor bean that show promising characteristics for inclusion in genetic improvement programs of this culture in Brazil. The study was conducted at the Paulista State University, Jaboticabal Campus. The accesses of castor bean seeds obtained were identified as ACS-001-CRSP, ACS-001-JASP, ACS-001-MASP, ACS-001-SESP, ACS-002-JASP, ACS-002-SESP and ACS-003-JASP, from the municipalities of Jaboticabal, Monte Alto, Santa Ernestina and from the District of Córrego Rico. The seeds' biometric variables and germination potential were measured, in addition to the biomass accumulation of the seedling's vegetative parts. The experimental design was completely randomized, with seven treatments and four replications. The original data was standardized and submitted to multivariate analysis of principal components and grouping. Through the results obtained, it is possible to reduce the number of original variables into two latent variables with discriminant power between the castor bean accesses, being the multivariate analysis efficient in this process. The castor bean accesses ACS-001-CRSP and ACS-001-MASP are promising for introduction in genetic improvement programs of this culture.

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Arsenic accumulation in Brassicaceae seedlings and its effects on growth and plant anatomy

Cited by 52 publications

References 58 publications

The Involvement of Nitric Oxide in Integration of Plant Physiological and Ultrastructural Adjustments in Response to Arsenic

The Involvement of Nitric Oxide in Integration of Plant Physiological and Ultrastructural Adjustments in Response to Arsenic

Root transcripts associated with arsenic accumulation in hyperaccumulator Pteris vittata

Screening of spontaneous castor bean accesses for genetic improvement programs

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