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

Abstract：

: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 (R(n)) 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 R(n) 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.

journal_name

Chemosphere

journal_title

Chemosphere

authors

Prado C,Rosa M,Pagano E,Hilal M,Prado FE

doi

10.1016/j.chemosphere.2010.08.033

subject

Has Abstract

pub_date

2010-10-01 00:00:00

pages

584-93

issue

5

eissn

0045-6535

issn

1879-1298

pii

S0045-6535(10)00941-0

journal_volume

81

pub_type

杂志文章

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