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Unraveling the mechanisms controlling Cd accumulation and Cd-tolerance in Brachiaria decumbens and Panicum maximum under summer and winter weather conditions.
Rabêlo, Flávio Henrique Silveira; Gaziola, Salete Aparecida; Rossi, Monica Lanzoni; Silveira, Neidiquele Maria; Wójcik, Malgorzata; Bajguz, Andrzej; Piotrowska-Niczyporuk, Alicja; Lavres, José; Linhares, Francisco Scaglia; Azevedo, Ricardo Antunes; Vangronsveld, Jaco; Alleoni, Luís Reynaldo Ferracciú.
Afiliação
  • Rabêlo FHS; College of Agriculture Luiz de Queiroz, University of São Paulo, Piracicaba, Brazil.
  • Gaziola SA; Centre for Environmental Sciences, Hasselt University, Diepenbeek, Belgium.
  • Rossi ML; College of Agriculture Luiz de Queiroz, University of São Paulo, Piracicaba, Brazil.
  • Silveira NM; Center for Nuclear Energy in Agriculture, University of São Paulo, Piracicaba, Brazil.
  • Wójcik M; Agronomic Institute, Center R&D in Ecophysiology and Biophysics, Campinas, Brazil.
  • Bajguz A; Faculty of Biology and Biotechnology, Maria Curie-Sklodowska University, Lublin, Poland.
  • Piotrowska-Niczyporuk A; Faculty of Biology and Chemistry, University of Bialystok, Bialystok, Poland.
  • Lavres J; Faculty of Biology and Chemistry, University of Bialystok, Bialystok, Poland.
  • Linhares FS; Center for Nuclear Energy in Agriculture, University of São Paulo, Piracicaba, Brazil.
  • Azevedo RA; Center for Nuclear Energy in Agriculture, University of São Paulo, Piracicaba, Brazil.
  • Vangronsveld J; College of Agriculture Luiz de Queiroz, University of São Paulo, Piracicaba, Brazil.
  • Alleoni LRF; Centre for Environmental Sciences, Hasselt University, Diepenbeek, Belgium.
Physiol Plant ; 173(1): 20-44, 2021 Sep.
Article em En | MEDLINE | ID: mdl-32602985
We evaluated the mechanisms that control Cd accumulation and distribution, and the mechanisms that protect the photosynthetic apparatus of Brachiaria decumbens Stapf. cv. Basilisk and Panicum maximum Jacq. cv. Massai from Cd-induced oxidative stress, as well as the effects of simulated summer or winter conditions on these mechanisms. Both grasses were grown in unpolluted and Cd-polluted Oxisol (0.63 and 3.6 mg Cd kg-1 soil, respectively) at summer and winter conditions. Grasses grown in the Cd-polluted Oxisol presented higher Cd concentration in their tissues in the winter conditions, but the shoot biomass production of both grasses was not affected by the experimental conditions. Cadmium was more accumulated in the root apoplast than the root symplast, contributing to increase the diameter and cell layers of the cambial region of both grasses. Roots of B. decumbens were more susceptible to disturbed nutrients uptake and nitrogen metabolism than roots of P. maximum. Both grasses translocated high amounts of Cd to their shoots resulting in oxidative stress. Oxidative stress in the leaves of both grasses was higher in summer than winter, but only in P. maximum superoxide dismutase (SOD) and ascorbate peroxidase (APX) activities were increased. However, CO2 assimilation was not affected due to the protection provided by reduced glutathione (GSH) and phytochelatins (PCs) that were more synthesized in shoots than roots. In summary, the root apoplast was not sufficiently effective to prevent Cd translocation from roots to shoot, but GSH and PCs provided good protection for the photosynthetic apparatus of both grasses.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Poluentes do Solo / Brachiaria / Panicum Idioma: En Revista: Physiol Plant Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Brasil País de publicação: Dinamarca
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Poluentes do Solo / Brachiaria / Panicum Idioma: En Revista: Physiol Plant Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Brasil País de publicação: Dinamarca