INVESTIGADORES
PRADO Carolina Del Valle
artículos
Título:
Seasonal variability of physiological and biochemical aspects of chromium accumulation in outdoor-grown Salvinia minima
Autor/es:
CAROLINA PRADO, MARIANA ROSA, EDUARDO PAGANO, MIRNA HILAL, FERNANDO E. PRADO
Revista:
CHEMOSPHERE
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Año: 2010 vol. 81 p. 584 - 593
ISSN:
0045-6535
Resumen:
Seasonal variations in physiological and biochemical parameters of the aquatic fern Salvinia minimaSalvinia minima
exposed to different Cr(VI) concentrations were studied. Growth, photosynthetic pigments, soluble carbohydrates,
sucrose-related enzymes, lipid peroxidation, phenolics, and Cr accumulation in floating
and submerged leaves were analyzed. Cr content was lower in winter than in summer, indicating that
active metabolic events occurred in metal uptake. Leaf number and metal concentration factor were
higher in summer than in winter. Relative growth rate (Rn) indicated that growth was more affected
by Cr in winter than in summer. Biochemical parameters showed great seasonal variations under increasing
Cr. Hexose, starch, malondialdehyde and phenolic contents were greatest in winter, but Rn and protein
values were lowest. Sucrose content was highest in summer floating leaves. A great seasonal
variability was observed in sucrose-related enzymes with the highest activities occurring in winter
lipoxygenase was much higher in winter than in summer, indicating a strong lipid peroxidation. Results
indicate that in Salvinia Cr causes seasonal perturbations in carbohydrate metabolism and oxidative
stress by altering both sucrose-related enzymes and lipoxygenase activities. Variability in physiological
and biochemical parameters seems to indicate that in outdoor conditions different mechanisms, in terms
of Cr accumulation and tolerance, may occur in S. minima during summer and winter.Rn) indicated that growth was more affected
by Cr in winter than in summer. Biochemical parameters showed great seasonal variations under increasing
Cr. Hexose, starch, malondialdehyde and phenolic contents were greatest in winter, but Rn and protein
values were lowest. Sucrose content was highest in summer floating leaves. A great seasonal
variability was observed in sucrose-related enzymes with the highest activities occurring in winter
lipoxygenase was much higher in winter than in summer, indicating a strong lipid peroxidation. Results
indicate that in Salvinia Cr causes seasonal perturbations in carbohydrate metabolism and oxidative
stress by altering both sucrose-related enzymes and lipoxygenase activities. Variability in physiological
and biochemical parameters seems to indicate that in outdoor conditions different mechanisms, in terms
of Cr accumulation and tolerance, may occur in S. minima during summer and winter.Rn and protein
values were lowest. Sucrose content was highest in summer floating leaves. A great seasonal
variability was observed in sucrose-related enzymes with the highest activities occurring in winter
lipoxygenase was much higher in winter than in summer, indicating a strong lipid peroxidation. Results
indicate that in Salvinia Cr causes seasonal perturbations in carbohydrate metabolism and oxidative
stress by altering both sucrose-related enzymes and lipoxygenase activities. Variability in physiological
and biochemical parameters seems to indicate that in outdoor conditions different mechanisms, in terms
of Cr accumulation and tolerance, may occur in S. minima during summer and winter.Salvinia Cr causes seasonal perturbations in carbohydrate metabolism and oxidative
stress by altering both sucrose-related enzymes and lipoxygenase activities. Variability in physiological
and biochemical parameters seems to indicate that in outdoor conditions different mechanisms, in terms
of Cr accumulation and tolerance, may occur in S. minima during summer and winter.S. minima during summer and winter.