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

Gomes, Marcelo Pedrosa; Marques, Teresa Cristina Lara Lanza de Sá e Melo; Nogueira, Mariana de Oliveira Gonçalves; Silva, Guilherme Henrique; Castro, Evaristo Mauro de; Soares, Ângela Maria

doi:10.1590/s2236-89062011000100012

Cited by 5 publications

(8 citation statements)

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“…Heavy metals influence the process of cell expansion by decreasing the cell size (GOMES et al, 2011a;GOMES et al, 2011b;MARQUES et al, 2011). Therefore, the observed increase in stomatal density in plants grown under contamination with heavy metals compensated for the smaller diameter stomata found in these conditions, confirming the data found in this study for B. arrecta cultivated under As contamination.…”

Section: Resultssupporting

confidence: 89%

“…A smaller number of vessels were present in metaxylem of Salix humboldtiana exposed to Zn and reported that heavy metals can reduce the number of xylem vessels, confirming the data found this study (GOMES et al, 2011a). In other words, toxic elements can alter the balance of the hormones that are directly related to the morphogenesis of the plant tissues.…”

Section: Resultssupporting

confidence: 89%

“…When working with Salix humboldtiana contaminated by zinc (Zn) in the soil, found that the soil with the highest level of contamination had a reduction in mesophyll thickness, resulting in a lower leaf thickness. This anatomical modification was attributed to the relatively smaller size of the mesophyll cells and to the collapse of the parenchyma cells (GOMES et al, 2011a). The same was observed by Gomes et al (2011b) in a study of Brachiaria decumbens exposed to cadmium (Cd) in soil and by Marques et al (2011) in a study of Eucalyptus camaldulensis exposed to Cd contamination in a nutrient solution.…”

Section: Resultsmentioning

confidence: 60%

“…In a study of S. humboldtiana (GOMES et al, 2011a), the greatest concentration of Zn caused lower leaf mesophyll and thus promoting the greater uptake of metal ions by the transpiration stream.…”

Section: Resultsmentioning

confidence: 98%

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Anatomical and physiological characteristics of tanner grass exposed to arsenic

Argenta

Oliveira

Castro

et al. 2013

RCA

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Phytoremediation is a biological process that stands out as an effective and economic alternative for the removal of toxic elements; however, its success depends on previous studies of plant species and the species' tolerance of certain pollutants. The aim was at evaluating the anatomy and physiology of Tanner grass (Brachiaria arrecta) to determine its anatomical and physiological plasticity characteristics that potentially enable arsenic tolerance. B. arrecta plants were cultivated in a greenhouse in a Hoagland-Arnon nutritive solution with the following As concentrations: 0.0, 0.25, 0.5, 1.0, 2.0 and 4.0 mg L-1. Gas exchange, anatomical characteristics, DNA quantification and arsenic absorption were evaluated at 18 and 21 days. An evaluation of plant growth was conducted to compare the selected plants at the beginning and after 21 days of the experiment. The plants absorbed the arsenic contained in the solution and showed an increase in the leaf stomatal density, mesophyll and leaf blade thickness and root endodermis and exodermis, and the anatomical modifications showed no evidence of stress in the plant structure. The gas exchange, growth and DNA content were not modified by arsenic in B. arrecta plants. The B. arrecta plants have anatomical and physiological characteristics that contribute to their survival in the presence of arsenic, possibly helped by the tolerance of this species of arsenic contamination from the nutrient solution and the lack of anatomical and physiological changes resulting in damage to this species. RESUMO: A fitorremediação é um processo biológico, que se destaca como alternativa eficaz e econômica à remoção de elementos tóxicos; porém, depende de estudos prévios de espécies vegetais e de suas características relacionadas à tolerância a esses poluentes. O objetivo deste trabalho foi avaliar a anatomia e a fisiologia de plantas de braquiária-dobrejo (Brachiaria arrecta), no intuito de detectar características de plasticidade anatômica e fisiológica, relacionadas à potencial tolerância dessa espécie ao arsênio. As plantas de B. arrecta foram cultivadas em casa de vegetação, em solução nutritiva de Hoagland-Arnon contendo as seguintes concentrações de arsênio: 0,0; 0,25; 0,5; 1,0; 2,0 e 4,0 mg L-1. Características de trocas gasosas, anatômicas, quantificação do DNA e absorção de arsênio foram avaliadas aos 18 e 21 dias. A avaliação do crescimento foi conduzida comparando-se plantas utilizadas no início do experimento e após 21 dias. As plantas absorveram o arsênio contido em solução e demonstraram aumento na densidade estomática, na espessura do mesofilo e no limbo foliar, sendo que as modificações anatômicas não indicaram evidências de estresse na estrutura das plantas. As trocas gasosas, o crescimento e o conteúdo de DNA não foram modificados pelo As nas plantas de B. arrecta. As plantas de B. arrecta apresentam características anatômicas e fisiológicas que contribuem para a sobrevivência da espécie, possivelmente por auxiliar na potencial tolerância dessas plantas à contaminação pelo...

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Section: Resultssupporting

confidence: 89%

Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 60%

Section: Resultsmentioning

confidence: 98%

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Anatomical and physiological characteristics of tanner grass exposed to arsenic

Argenta

Oliveira

Castro

et al. 2013

RCA

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“…According to Rodrigues, Santos, Santos, Pereira, and Sobrinho (2016), the plant increases its filtering capacity by increasing its negative charges to protect internal tissues from the damage caused by toxic metals. Various studies point to the endoderm and exoderm as the main barriers and retention sites of toxic metals in plant roots, which minimize the translocation of these ions and favor tolerance to this stress (Gomes, Marques, Nogueira, Silva, Castro, & Soares, 2011). Our results are in agreement with Mondal, Das, Roy, Datta, and Banerjee (2013), who reported that a reduction in root growth could be due to the direct interference of Cd with some hydrolytic enzymes, which play a fundamental role in the transport of nutrients to the primary root and stem.…”

Section: Degrees Of Freedommentioning

confidence: 99%

Cadmium toxicity on seed germination and initial growth of chia

Viana

Neves

2019

Acta Sci. Biol. Sci.

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In recent years, there has been a growing concern related to soil and water contamination due to the constant dispersal of toxic metals. In addition to their ecotoxicological potential, these elements exhibit a cumulative character that favors their permanence in soil and passage to living organisms, which can lead to an ecological imbalance. Among toxic metals, cadmium (Cd) is an obstacle to agriculture because it can adversely affect food quality and human health, as well as diminish plant growth and productivity. Thus, the objective of this work was to evaluate the toxicity of cadmium on seed germination and initial growth of chia. The ecotoxicological effects of four Cd concentrations (15; 30; 45; and 60 mg L -1 ) were evaluated. The response variables were germination percentage, first count, germination speed index, total length, shoot length, root length, seedling dry mass, and tolerance index. It is concluded that the presence and accumulation of Cd in the culture substrate played an inhibitory role in seed germination and initial seedling growth of chia starting at 15 mg L -1 . On the other hand, no significant effect was observed for the treatments in relation to dry mass of the chia seedlings.

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