Seasonal variability of physiological and biochemical aspects of chromium accumulation in outdoor - grown Salvinia minima

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Seasonal variations in physiological and biochemical parameters of the aquatic fern Salvinia 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...

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Detalles Bibliográficos
Otros Autores: Prado, Carolina, Rosa, Mariana, Pagano, Eduardo Antonio, Hilal, Mirna, Prado, Fernando E.
Formato: Artículo
Lenguaje:Inglés
Materias:
CARBOHYDRATES
ENZYMES
LIPID PEROXIDATION
SEASONAL VARIABILITY
BIOCHEMICAL PARAMETERS
CARBOHYDRATE METABOLISM
CR CONTENT
DIFFERENT MECHANISMS
LIPOXYGENASES
MALONDIALDEHYDE
METAL CONCENTRATIONS
METAL UPTAKE
PHENOLIC CONTENT
PHENOLICS
PHOTOSYNTHETIC PIGMENTS
RELATIVE GROWTH RATE
SOLUBLE CARBOHYDRATES
ALDEHYDES
CATALYSTS
CHROMIUM COMPOUNDS
METABOLISM
OXIDATION
OXIDATIVE STRESS
PHENOLS
PHYSIOLOGICAL MODELS
PHYSIOLOGY
SUGAR [SUCROSE]
CHROMIUM
CARBOHYDRATE
HEXOSE
LIPOXYGENASE
PHENOL
PIGMENT
STARCH
SUCROSE
BIOACCUMULATION
BIOCHEMICAL COMPOSITION
ENZYME
ENZYME ACTIVITY
FERN
GROWTH RATE
LIPID
PHENOLIC COMPOUND
PHYSIOLOGICAL RESPONSE
SEASONAL VARIATION
CARBOHYDRATE ANALYSIS
CHEMICAL ANALYSIS
CONCENTRATION [PARAMETERS]
CONTROLLED STUDY
NONHUMAN
PLANT GROWTH
PLANT LEAF
PROTEIN CONTENT
SALVINIA MINIMA
SUMMER
WINTER
BETA-FRUCTOFURANOSIDASE
CHLOROPHYLL
FERNS
GLUCOSYLTRANSFERASES
PHOTOSYNTHESIS
SEASONS
WATER POLLUTANTS, CHEMICAL
FILICOPHYTA
SALVINIA
Acceso en línea:http://ri.agro.uba.ar/files/intranet/articulo/2010Prado2.pdf
LINK AL EDITOR
Aporte de:Registro referencial: Solicitar el recurso aquí
Biblioteca Central (FAUBA) de Universidad de Buenos Aires
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245 1 0 |a Seasonal variability of physiological and biochemical aspects of chromium accumulation in outdoor - grown Salvinia minima 
520 |a Seasonal variations in physiological and biochemical parameters of the aquatic fern Salvinia 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. 
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