Effect of root age on the allocation of metals, amino acids and sugars in different cell fractions of the perennial grass Paspalum notatum (bahiagrass)

Effect of root age on the allocation of metals, amino acids and sugars in different cell fractions of the perennial grass Paspalum notatum (bahiagrass)

Author Nabais, Cristina Google Scholar
Labuto, Georgia Autor UNIFESP Google Scholar
Goncalves, Susana C. Google Scholar
Buscardo, Erika Google Scholar
Semensatto, Decio Autor UNIFESP Google Scholar
Nogueira, Ana Rita A. Google Scholar
Freitas, Helena Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Univ Coimbra
Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA)
Abstract 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 Cu was higher in intracellular components, both in younger and older roots, as expected from an essential nutrient. Ni content was very low in older roots and in younger roots it was 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. (C) 2011 Elsevier Masson SAS. All rights reserved.
Keywords Aluminium
Copper
Glycoproteins
Iron
Nickel
Polysaccharides
Language English
Sponsor Fundacao para a Ciencia e Tecnologia (Portugal)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Grant number Fundacao para a Ciencia e Tecnologia (Portugal): POCTI/1999/MGS/35653
FAPESP: 00/05668-0
Date 2011-12-01
Published in Plant Physiology and Biochemistry. Paris: Elsevier France-editions Scientifiques Medicales Elsevier, v. 49, n. 12, p. 1442-1447, 2011.
ISSN 0981-9428 (Sherpa/Romeo, impact factor)
Publisher Elsevier B.V.
Extent 1442-1447
Origin http://dx.doi.org/10.1016/j.plaphy.2011.09.010
Access rights Closed access
Type Article
Web of Science ID WOS:000297879400009
URI http://repositorio.unifesp.br/handle/11600/34301

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