Data/hora: 02/06/2024 06:49:03

Biblioteca(s): | Embrapa Pecuária Sudeste.
Data corrente: | 31/10/2011
Data da última atualização: | 21/07/2022
Autoria: | NABAIS, C.; LABUTO, G.; GONÇALVES, S.; BUSCARDO, E.; SEMENSATTO, D.; NOGUEIRA, A. R. de A.; FREITAS, H.
Afiliação: | CRISTINA NABAIS, FACULDADE DE CIÊNCIAS E TECNOLOGIA, UNIVERSIDADE DE COIMBRA/COIMBRA, PORTUGAL; GEÓRGIA LABUTO, UNIVERSIDADE FEDERAL DE SÃO PAULO/SÃO PAULO; SUSANA GONÇALVES, FACULDADE DE CIÊNCIAS E TECNOLOGIA, UNIVERSIDADE DE COIMBRA/COIMBRA, PORTUGAL; ERIKA BUSCARDO, FACULDADE DE CIÊNCIAS E TECNOLOGIA, UNIVERSIDADE DE COIMBRA/COIMBRA, PORTUGAL; DÉCIO SEMENSATTO, UNIVERSIDADE FEDERAL DE SÃO PAULO/SÃO PAULO; ANA RITA DE ARAUJO NOGUEIRA, CPPSE; HELENA FREITAS, FACULDADE DE CIÊNCIAS E TECNOLOGIA, UNIVERSIDADE DE COIMBRA/COIMBRA, PORTUGAL.
Título: | Effect of root age on the allocation of metals, amino acids and sugars in different cell fractions of the perennial grass Paspalum notatum (bahiagrass).
Ano de publicação: | 2011
Fonte/Imprenta: | Plant Physiology and Biochemistry, v. 49, n. 12, p. 1442-1447, dec. 2011.
DOI: | https://doi.org/10.1016/j.plaphy.2011.09.010
Idioma: | Inglês
Conteúdo: | This work aimed to compare the allocation of Al, Fe, Cu, Ni, amino acids and sugars in different fractions of root cells of Paspalum notatum with 21 and 120 days old grown in quartz sand. In general younger roots showed a higher content of Al, Fe, Cu Ni, amino acids and sugars, compared to older roots. This can be due to a higher metabolic activity of younger roots and/or to structural changes that can occur with cell ageing. Al and Fe were mainly allocated to fractions with pectin, hemicellulose and cellulose, both in younger and older roots. However, older roots also showed a significant fraction of Al allocated to the intracellular fraction. It seems that older roots were less able to prevent the entry of Al in the cytoplasm. The proportion of Cuwas higher in intracellular components, both in younger and older roots, as expected from an essential nutrient. Ni contentwas very low in older roots and in younger roots itwas mainly allocated to the intracellular fraction and to the cell wall polysaccharides fraction. The amino acids were mainly allocated to the cytoplasm and polysaccharide fraction. Although younger roots showed a higher total amount of amino acids compared to older roots, the amino acids profile and allocation, mainly in the cytoplasm polysaccharides, was quite similar. Arabinose, a major component of structural glycoproteins of the primary cell wall matrix, was only detected in younger roots. Thus, it seems that root cells of P. notatum suffered changes in the composition of the cell wall components with ageing. To further understand the structural changes of root cells with ageing and its effect on metal allocation, it is important to quantify several components of the cell wall matrix, namely pectins and glycoproteins.
Palavras-Chave: | Aluminium.
Thesaurus Nal: | copper; glycoproteins; iron; nickel; polysaccharides.
Categoria do assunto: | W Química e Física
Registro original: | Embrapa Pecuária Sudeste (CPPSE)
Exemplares: | CPPSE - (20638-1) - UPC - AP - DD - PROCI-2011.00120 - NAB - 2011.00120 - DIS