Cadmium effects on mineral accumulation, antioxidant defence system and gas exchange in cucumber

Abstract

The effects of different concentrations (10, 50, 100 and 500 μM) of cadmium (Cd) on manganese (Mn) and iron (Fe), lipid peroxidation, activities of antioxidant enzymes and photosynthetic function were investigated in hydroponically grown cucumber (Cucumis sativus L.). Results indicated that cadmium was accumulated primarily in roots. In the roots and shoots, the cadmium content increased with the increasing cadmium concentrations, and induced decrease of manganese significantly (P < 0.005). The levels of iron had an increasing trend with increasing cadmium concentration and duration of treatment. Cadmium-induced oxidation stress and lipid peroxidation in C. sativus showed by the increased concentration of MDA (malondialdehyde). Cadmium induced higher SOD (superoxide dismutase) and POD (peroxidase) activities than CAT (catalase) activity, suggesting that SOD and POD provided a better defence mechanism against cadmium-induced oxidative damage in C. sativus. The net photosynthetic rate, transpiration rate, stomatal conductance and intercellular CO 2 concentration were reduced in the presence of cadmium.

Magnetic (Fe3O4) Nanoparticles Reduce Heavy Metals Uptake and Mitigate Their Toxicity in Wheat Seedling

“…In general, selected heavy metal solutions demonstrated a concentration-dependent inhibition on seedling growth. A similar phenomenon has been reported in a previous study on phytotoxicity of heavy metals on plants [16,[39][40][41][42]. Mahmood et al [43] (p. 451) found that the effects of Cu on root length of rice and wheat seedlings were more pronounced than that of Pb and Zn, while the root length of all crop seedlings was significantly affected by increasing Cu, Pb and Zn.…”

Cadmium Effects on Mineral Accumulation and Selected Physiological and Biochemical Characters of Salix babylonica L.

“…Plants possess a number of antioxidant systems that protect them from oxidative damage [49]. These defensive systems are composed of enzymatic scavengers of activated oxygen such as SOD, POD, and CAT [50].…”

Role of inoculation with multi-trait rhizobacteria on strawberries under water deficit stress

“…The concentration of H 2 O 2 was estimated by measuring the absorbance of the titanium-hydroperoxide complex and using a standard curve plotted with a known concentration of H 2 O 2 . Oxidative damage to lipids was determined by measuring the content of malondialdehyde (MDA), prepared in 10% trichloroacetic acid containing 0.65% 2-thiobarbituric acid (TBA) and heated at 95°C for 25 min, and then quickly cooled (Sun et al, 2015). MDA content was calculated by correcting for compounds other than MDA which absorb at 532 nm by subtracting the absorbance at 532 nm of a solution containing plant extract incubated without TBA from an identical solution containing TBA.…”