GOAL, SCOPE AND BACKGROUND Elevated concentrations of copper in the environment result in accumulation of the metal in plants and cause an increase in reactive oxidative species (ROS). The first response to elevated amounts of ROS is increased levels of enzymatic and non-enzymatic antioxidants that reduce oxidative stress. The aim of our study was to evaluate the early stages of antioxidative r...

Cucumber plants (Cucumis sativus L.) were grown under controlled conditions and fumi­ gated with either 0 3, diluted automobile exhaust or a combination of both. The ratio of variable to maximum chlorophyll fluorescence (FJFm) was estimated as a measure of PSII activity Activities of the enzymes catalase, glutathione reductase and guaiacol-dependent peroxidase and contents of the antioxidants a...

This work was aimed to explore the efficacy of activated charcoal (5 mg g-1 soil) in abating fluoride (25 L-1 NaF) stress rice seedlings, since protective role is widely reported against other forms abiotic stress. Application NaF solution reduced germination rate, dry and fresh weight, shoot root length seedlings. Extensive accumulation lowered chlorophyll level along with higher electrolyte l...

Nitric oxide (NO) is involved in numerous physiological and stress responses in higher plants. Tomato is one of the most important vegetable crops in the world and previously it has been reported that salinity induced an oxidative stress affecting its redox and NO homeostasis. Using tomato plant exposed to 120 mM NaCl, it was studied whether the exogenous application of NO could ameliorate the ...

Peroxidase and hydrogen peroxide both play important roles in the final stages of the lignification pathway. Peroxidase, in the presence of H2O2 catalyses the oxidation of monolignols to give lignin. In order to examine this process we looked at lignification in transgenic tobacco plants expressing a barley peroxidase gene, HvPrx8, either alone or in combination with a wheat germin gene, g.f 2....

All aerobic biological systems, including N(2)-fixing root nodules, are subject to O(2) toxicity that results from the formation of reactive intermediates such as H(2)O(2) and free radicals of O(2). H(2)O(2) may be removed from root nodules in a series of enzymic reactions involving ascorbate peroxidase, dehydroascorbate reductase, and glutathione reductase. We confirm here the presence of thes...

Cadmium (Cd), as a widespread metal pollutant, readily accumulates in the food chain due to its easy absorption and high mobility. The endophytic fungi are cosmopolitan microorganisms that occur widely in association with plants in a heavy metal stress environment. A current pot experiment was conducted to evaluate the influence of Piriformospora indica, as a root endosymbiotic fungus, on the b...

In thе prеsent studу, a simрle protосоl for in vitro rooting induction of the important medicinal plant Coleus forskohlii Briq with high content secondary metabolites antioxidant activity was described. For germination seeds C. were placed on MS medium suррlemented 0.4 mg L-1 gibberellic acid and 1.0 CaCl2. The оbtаinеd shoots cultured half-strength ½ containing indole-3-butyric (IBA) or indole...

The effect of thermal stress on the antioxidant system was investigated in two invasive plants, Eupatorium adenophorum Spreng. and E. odoratum L. The former is sensitive to high temperature, whereas the latter is sensitive to low temperature. Our aim was to explore the relationship between the response of antioxidant enzymes and temperature in the two invasive weeds with different distribution ...