The Experts below are selected from a list of 261 Experts worldwide ranked by ideXlab platform

Luiz Roberto Guimarães Guilherme - One of the best experts on this subject based on the ideXlab platform.

  • Interactions of cadmium and zinc in high zinc tolerant native species Andropogon gayanus cultivated in hydroponics: growth endpoints, metal bioaccumulation, and ultrastructural analysis
    Environmental science and pollution research international, 2020
    Co-Authors: Paula Godinho Ribeiro, Gabriel Caixeta Martins, Cristiano Gonçalves Moreira, Cynthia De Oliveira, Maria Luiza De Carvalho Andrade, Thais Silva Sales, Wantuir Filipe Teixeira Chagas, Cláudia Regina Gontijo Labory, Teotonio Soares De Carvalho, Luiz Roberto Guimarães Guilherme
    Abstract:

    Cadmium (Cd) and zinc (Zn) toxicity causes physiological disorders and harms plants, interfering with the rehabilitation of areas affected by mining activities. This study evaluated how the exposure to Zn and/or Cd affects the growth of native Andropogon grass (Andropogon gayanus Kunth) plants originally found in areas contaminated with Cd and/or Zn due to zinc mining activities. Plants were cultivated for 7 weeks in a nutrient solution treated with Zn (142.3–854.0 μM) or Cd (0.9–13.3 μM) separately or combined with a molar ratio of 64:1 (Zn:Cd). A control treatment was grown in a complete Hoagland and Arnon solution (without Cd). Plant height, stem diameter, internode length, dry weight, Cd and Zn concentration, and accumulation in shoots/roots, as well as ultrastructure of roots and leaves were analyzed at the end of the experiment. The root dry weight was not significantly affected by the addition of the metals. Moreover, Zn provided higher shoot dry weight (up to 160%) relative to control. Andropogon grass tolerated both metals better separately than when applied together. Transmission electron microscopy analyses showed modifications such as vesiculation and vacuolation in the ultrastructure of Andropogon tissues by Cd and/or Zn. The Andropogon grass was tolerant to the doses tested, evidencing that it has potential for recovering areas contaminated with Zn and/or Cd.

Tadashi Okamoto - One of the best experts on this subject based on the ideXlab platform.

Takashi Enomoto - One of the best experts on this subject based on the ideXlab platform.

  • Wild plants, Andropogon virginicus L. and Miscanthus sinensis Anders, are tolerant to multiple stresses including aluminum, heavy metals and oxidative stresses
    Plant cell reports, 2008
    Co-Authors: Bunichi Ezaki, Erika Nagao, Yoshifumi Yamamoto, Susumu Nakashima, Takashi Enomoto
    Abstract:

    To isolate high-tolerant plants against aluminum (Al), heavy metals and/or oxidative stresses as a final goal, screening of Al tolerant plants from a collection of 49 wild plants was first of all performed in this study. Andropogon virginicus L. and Miscanthus sinensis Anders showed high Al tolerant phenotypes (more than 35% values in both relative root growth and germination frequency even under 900 μM Al concentration) in our screening. Al tolerance mechanisms in these two plants were characterized and the results suggested that (1) a transport system of toxic Al ions from root to shoot, (2) a suppression of Al accumulation in root tip region and (3) a suppression of oxidative damages by an induction of anti-peroxidation enzymes, such as superoxide dismutase (SOD) and catalase, were involved in the tolerance mechanisms. Six wild plants [Andropogon, Miscanthus, Dianthus japonicus Thunb, Echinochloa crus-galli (L.) Beauv, Reynoutria japonica Houtt, and Sporobolus fertilis (Steud.) W. Clayton] were furthermore tested for their sensitivity against heavy metal stresses and oxidative stresses. The two high Al tolerant plants, Andropogon and/or Miscanthus, showed tolerance to Cr, Zn, diamide or hydrogen peroxide, suggesting common tolerance mechanisms among the tested stresses. Reynoutria showed tolerance to diamide and hydrogen peroxide, Sporobolus to Cr and Echinocholoa to Cd and Cu. Moreover, the collection of wild plants used in this study was a very useful kit to isolate tolerant plants against various abiotic stresses within a short period of time.

Paula Godinho Ribeiro - One of the best experts on this subject based on the ideXlab platform.

  • Interactions of cadmium and zinc in high zinc tolerant native species Andropogon gayanus cultivated in hydroponics: growth endpoints, metal bioaccumulation, and ultrastructural analysis
    Environmental science and pollution research international, 2020
    Co-Authors: Paula Godinho Ribeiro, Gabriel Caixeta Martins, Cristiano Gonçalves Moreira, Cynthia De Oliveira, Maria Luiza De Carvalho Andrade, Thais Silva Sales, Wantuir Filipe Teixeira Chagas, Cláudia Regina Gontijo Labory, Teotonio Soares De Carvalho, Luiz Roberto Guimarães Guilherme
    Abstract:

    Cadmium (Cd) and zinc (Zn) toxicity causes physiological disorders and harms plants, interfering with the rehabilitation of areas affected by mining activities. This study evaluated how the exposure to Zn and/or Cd affects the growth of native Andropogon grass (Andropogon gayanus Kunth) plants originally found in areas contaminated with Cd and/or Zn due to zinc mining activities. Plants were cultivated for 7 weeks in a nutrient solution treated with Zn (142.3–854.0 μM) or Cd (0.9–13.3 μM) separately or combined with a molar ratio of 64:1 (Zn:Cd). A control treatment was grown in a complete Hoagland and Arnon solution (without Cd). Plant height, stem diameter, internode length, dry weight, Cd and Zn concentration, and accumulation in shoots/roots, as well as ultrastructure of roots and leaves were analyzed at the end of the experiment. The root dry weight was not significantly affected by the addition of the metals. Moreover, Zn provided higher shoot dry weight (up to 160%) relative to control. Andropogon grass tolerated both metals better separately than when applied together. Transmission electron microscopy analyses showed modifications such as vesiculation and vacuolation in the ultrastructure of Andropogon tissues by Cd and/or Zn. The Andropogon grass was tolerant to the doses tested, evidencing that it has potential for recovering areas contaminated with Zn and/or Cd.

Takashi Kitayama - One of the best experts on this subject based on the ideXlab platform.