INVESTIGADORES
PRADO Carolina Del Valle
artículos
Título:
Uptake of chromium by Salvinia minima : Effect of plant growth, leaf respiration and carbohidate metabolism
Autor/es:
CAROLINA PRADO, LUISA RODRIGUEZ-MONTELONGO, JUAN A. GONZÁLEZ, EDUARDO A. PAGANO, MIRNA HILAL, FERNANDO E. PRADO
Revista:
JOURNAL OF HAZARDOUS MATERIALS.
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Año: 2010 p. 546 - 553
ISSN:
0304-3894
Resumen:
Metabolic responses to chromium (Cr) exposure and metal uptake were investigated using Salvinia minimaSalvinia minima
plants. Cr treatment reduced the dry weight of floating and submerged leaves, while photosynthetic
pigments were not affected. Measurements of respiratory oxygen uptake with and without inhibitors
(KCN and SHAM) demonstrated that total respiration, alternative oxidase capacity and residual respiration
were higher in Cr-treated than in Cr-untreated leaves, but the highest values were observed in
floating leaves. Cr affected the soluble sugar content. Sucrose concentration was, in general, higher in Crtreated
than in Cr-untreated leaves, while the glucose concentration showed an inverse pattern. Cr also
affected soluble acid invertase activity, but affectation trend was different between both leaves. Highest
values of invertase activity were observed in Cr-treated floating leaves. According to our data soluble
acid invertase and sucrose seem to be related to alternative oxidase capacity and residual respiration in
floating and submerged leaves exposed to Cr. Thereby, this study constitutes an important contribution to
understand metabolic relationships between mitochondrial respiration, alternative respiratory pathway
and soluble carbohydrates in plants exposed to heavy metals.