Integrating Biochemical, Morpho-physiological, Nutritional, and Productive Responses to Cd Accumulation in Massai Grass Employed in Phytoremediation

Autor(es)

Silveira Rabelo, Flavio Henrique ^[1] ; Moral, Rafael de Andrade ^[2] ; Lavres, Jose ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Ctr Nucl Energy Agr, Piracicaba - Brazil

^[2] Maynooth Univ, Dept Math & Stat, Maynooth, Kildare - Ireland

• Tipo de documento: Artigo Científico
• Fonte: WATER AIR AND SOIL POLLUTION; v. 230, n. 5 MAY 2019.
• Citações Web of Science: 1

Resumo

Cadmium (Cd) phytoextraction efficiency basically depends on Cd accumulation in their tissues. Thus, our aim in this study was to select biochemical, morpho-physiological, nutritional, and productive responses associated to Cd accumulation in the roots, stems and sheaths, and leaf blades of Panicum maximum cv. Massai (Massai grass), using the random forests analysis. Massai grass was exposed to combinations of three sulfur (S) concentrations (0.1, 1.9, and 3.7mmolL(-1)) and two Cd concentrations (0.0 and 0.1mmolL(-1)) in nutrient solutions. The dry biomass production of Massai grass exposed to Cd decreased by around 50% in relation to control. However, there were no visual symptoms of Cd toxicity in the shoot of this plant, even with Cd concentrations in their shoot exceeding 100mgkg(-1) DW. The lowest dry biomass production of the plants exposed to Cd combined with the absence of visual symptoms of Cd toxicity indicates us that Massai grass is a bioindicator plant that can greatly cope with the Cd-induced stress, but in a little bit different way from other plants. Antioxidant enzymes apparently are not essential for Massai grass cope with Cd-induced stress, differently of other mechanisms (e.g., higher synthesis of thiol compounds and amino acids involved on reactive oxygen species (ROS) scavenging and Cd chelation). Probably, the plant responses that most explained Cd accumulation in Massai grass can be used to identify grasses with high capacity to accumulate Cd in phytoremediation programs with this group of plants. (AU)

• Processo FAPESP: 15/21562-2 - Síntese de fitoquelatinas e expressão de genes envolvidos no controle do estresse oxidativo e na detoxificação de cádmio em Panicum maximum Jacq. cv. Tanzânia suprido com enxofre
• Beneficiário: Flávio Henrique Silveira Rabêlo
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• Processo FAPESP: 14/18735-0 - Absorção radicular apoplástica e simplástica de 111Cd, estresse oxidativo e alterações ultra-estruturais em plantas de Panicum maximum supridas com enxofre
• Beneficiário: José Lavres Junior
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 14/16731-7 - Relação entre enxofre e os mecanismos de detoxificação de cádmio (111Cd) em plantas de Panicum maximum cv. Tanzânia
• Beneficiário: Flávio Henrique Silveira Rabêlo
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 14/03310-3 - Modelos e métodos estatísticos para análise de dados entomológicos
• Beneficiário: Rafael de Andrade Moral
• Modalidade de apoio: Bolsas no Brasil - Doutorado