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Ultraviolet-B (UV-B) radiation has a negative impact on plant cells, and leads to the generation of reactive oxygen species (ROS). Heme oxygenase (HO, EC plays a protective role against oxidative stress in mammals, but little is known about this issue in plants. Here, we report for the first time the response of HO in leaves of soybean (Glycine(More)
We have previously demonstrated that the induction of heme oxygenase-1 (EC plays a protective role for mammalian cells against oxidative stress. Here, we investigated for the first time the possible role of heme oxygenase-1 as an antioxidant defense in leaves of soybean plants. Treatment with 200 microM Cd during 48 h caused a 70% increase in(More)
Heme oxygenase (HO, EC catalyzes the oxidative conversion of heme to biliverdin IXalpha with the concomitant release of carbon monoxide and iron. Recently, HO has been involved in the protection against oxidative stress in plants. The fact that nitric oxide (NO), an endogenous signaling molecule in animals and plants mediates responses to abiotic(More)
Males and females judged the intensity of the typical pungent stimulus CO2, presented by nose and by mouth, employing two scaling procedures: magnitude estimation and magnitude matching. The two groups differed in their perception of CO2 pungency only when it was judged in the nose. Perceived nasal pungency grew as a power function of CO2 concentration,(More)
Two experiments are reported in which the perceptual interactions between oral pungency, evoked by CO2, and the taste of each of four tastants--sucrose (sweet), quinine sulfate (bitter), sodium chloride (salty), and tartaric acid (sour)--were explored. In experiment 1 the effect of three concentrations of each tastant on the stimulus-response function for(More)
Delta-aminolevulinic acid (ALA), precursor of heme, accumulates in a number of organs, particularly in liver of patients with acute porphyrias or lead intoxication. This study characterizes the involvement of bilirubin as an antioxidant in a chronic intoxication with ALA. Female Wistar rats were injected intraperitoneally a daily dose of 40 mg ALA/body wt.,(More)
Cadmium toxicity has been extensively studied in plants, however its biochemical mechanism of action has not yet been well established. To fulfil this objective, four-weeks-old soybean nodulated plants were treated with 200 muM Cd(2+) for 48 h. delta-aminolevulinic acid dehydratase (ALA-D, E.C. activity and protein expression, as well as(More)
The protective action of salicylic acid (SA) pre-treatment on soybean plants before cadmium (Cd) addition was tested. Oxidative stress parameters, such as TBARS formation, glutathione and chlorophyll content, were altered by Cd, instead no differences were observed in plants only pre-treated with SA. Antioxidant enzymes were affected by Cd treatment, while(More)
In this study, the possibility of enhancing cold stress tolerance of soybean plants (Glycine max L.) by exogenous application of 5-aminolevulinic acid (ALA) was investigated. ALA was added to the Hoagland solution at various concentrations ranging from 0 to 40 μM for 12 h. After ALA treatment, the plants were subjected to cold stress at 4°C for 48 h. ALA at(More)
The aim of this study was to provide new insights into the role of angiotensin II and arterial pressure in the regulation of antioxidant enzyme activities in a renovascular model of cardiac hypertrophy. For this purpose, aortic coarcted rats were treated with losartan or minoxidil for 7 days. Angiotensin II induced cardiac hypertrophy and oxidative stress(More)