Uptake of chromium by Salvinia minima effect on plant growth, leaf respiration and carbohydrate metabolism

Uptake of chromium by Salvinia minima effect on plant growth, leaf respiration and carbohydrate metabolism

Metabolic responses to chromium [Cr] exposure and metal uptake were investigated using Salvinia 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 Cr-treated 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.

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Bibliographic Details
Main Authors: Prado, C., Rodríguez Montelongo, L., González, J. A., Pagano, Eduardo Antonio, Hilal, Mirna, Prado, Fernando E.
Format: Texto biblioteca
Language:eng
Subjects:ALTERNATIVE RESPIRATION, CARBOHYDRATES, CR, INVERTASE, SALVINIA MINIMA, ACID INVERTASE, ALTERNATIVE OXIDASE, CARBOHYDRATE METABOLISM, DRY WEIGHT, GLUCOSE CONCENTRATION, IN-PLANTS, INVERTASE ACTIVITY, LEAF RESPIRATION, METABOLIC RELATIONSHIPS, METAL UPTAKE, MITOCHONDRIAL RESPIRATION, OXYGEN UPTAKE, PHOTOSYNTHETIC PIGMENTS, PLANT GROWTH, RESPIRATORY PATHWAY, SOLUBLE CARBOHYDRATES, SOLUBLE SUGARS, SUCROSE CONCENTRATION, ACIDS, GLUCOSE, HEAVY METALS, METABOLISM, OXYGEN, PHYSIOLOGY, PLANT LIFE EXTENSION, PLANTS [BOTANY], SUGAR [SUCROSE], CHROMIUM, BETA FRUCTOFURANOSIDASE, CARBOHYDRATE, OXIDOREDUCTASE, PIGMENT, SUGAR, ENZYME ACTIVITY, FERN, LEAF AREA, MEASUREMENT METHOD, RESPIRATION, BIOMASS, CONTROLLED STUDY, EXTRACTION, NONHUMAN, OXYGEN CONSUMPTION, PHOTOSYNTHESIS, PLANT, PLANT LEAF, CELL RESPIRATION, FERNS, PLANT LEAVES,
Online Access:http://ceiba.agro.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=46453
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Summary:Metabolic responses to chromium [Cr] exposure and metal uptake were investigated using Salvinia 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 Cr-treated 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.

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