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Full-Text Articles in Life Sciences
Soybean Root Exudates Increase The Physiological Diversity Of Bacteria In Cadmium-Treated Soil, Leily Kazemi Movahed
Soybean Root Exudates Increase The Physiological Diversity Of Bacteria In Cadmium-Treated Soil, Leily Kazemi Movahed
Electronic Thesis and Dissertation Repository
Three soybean cultivars with contrasting retention of cadmium (Cd) in the root were grown in Cd-spiked nutrient solution and used to determine that symplastic compartmentalization of Cd in roots is probably responsible for retention of Cd in roots. Roots of the low Cd-accumulator AC Hime treated with 30 mM Cd exuded up to 10-fold higher concentrations of citric, succinic, fumaric and malic acids into the hydroponic solution when compared to control; concentrations of the same organic acids from the high Cd-accumulator Westag 97 increased by up to 3-fold. The same cultivars were grown in Cd-spiked soil and the physiological profiles …
A Modelling Approach: Effects Of Exuded Organic Acids And Exogenous Chelating Ligands On Bioavailability And Uptake Of Metals By Radishes (Raphanus Sativus) Grown In Hydroponics., Sergio A. Dominguez Romero
A Modelling Approach: Effects Of Exuded Organic Acids And Exogenous Chelating Ligands On Bioavailability And Uptake Of Metals By Radishes (Raphanus Sativus) Grown In Hydroponics., Sergio A. Dominguez Romero
Electronic Thesis and Dissertation Repository
Metal contamination of soil can be reduced by adding chelators to improve the efficiency of metal uptake in phytoremediation, but optimal concentrations and types of chelators have not been determined. A geochemical model (Visual MINTEQ3.1) was used to estimate the effects of four chelators on the solubility of four metals in hydroponic solution. The model showed that no iron was soluble in the absence of a chelator, while the solubilities of cadmium, copper and zinc were high with or without chelators. Despite low iron uptake in all treatments, symptoms of iron-deficiency were not visible. High concentrations of exuded organic acids …
Absence Of Phosphoenolpyruvate Carboxylase Atppc3 Increases Sensitivity Of Arabidopsis Thaliana To Cadmium, Ian R. Willick
Absence Of Phosphoenolpyruvate Carboxylase Atppc3 Increases Sensitivity Of Arabidopsis Thaliana To Cadmium, Ian R. Willick
Electronic Thesis and Dissertation Repository
Phosphoenolpyruvate carboxylase (PEPC) and PEPC kinase (PPCK) catalyze a reaction feeding into the tricarboxylic acid (TCA) cycle, increasing the production of metal-chelating organic acids. Little research has been conducted on PEPC isoenzymes in Cd-stressed plants. Arabidopsis (Arabidopsis thaliana) wild-type and AtPPC1 – AtPPC3 mutants, each lacking one of three PEPC isoenzymes, grown in 0, 1, or 5 µM CdCl2 were smaller and had increased AtPPC1 – AtPPC3 and AtPPCK1 – AtPPCK2 transcript abundance, relative phosphorylation, and PEPC activity, more so in roots than shoots. Concentrations of oxaloacetate, citrate and total organic acids increased with greater CdCl2 …
Cadmium Accumulation And Distribution In Lettuce And Barley, Fardausi Akhter
Cadmium Accumulation And Distribution In Lettuce And Barley, Fardausi Akhter
Electronic Thesis and Dissertation Repository
Cadmium (Cd) is a non-essential trace element and its environmental concentrations are increasing due to human activities. Edible plants can accumulate high concentrations of Cd, which could be toxic to humans. Understanding how and where Cd is stored in plants is important for ensuring lower concentration of Cd in the food. In this thesis, the accumulation and distribution of Cd in three agricultural plants, namely lettuce (Lactuca sativa L.), barley (Hordeum vulgare L.) and radish (Raphanus sativus L.), were investigated with a focus on the potential mechanisms involved in the localization of Cd in the root. The …