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Showing 2 results for Sadeghzadeh
Quantifying the response of growth, some physiological and biochemical traits of canola (Brassica napus L.) plant to lead concentration in the soil
Mehranoosh Emamian Tabarestani, Hemmatollah Pirdashti, Mohammad Ali Tajik Ghanbary, Fardin Sadeghzadeh,
Volume 9, Issue 36 (vol. 9, no. 36 2020)
Abstract
In order to quantify the response of canola (Brassica napus L.) plant to lead different levels, an experiment was conducted in completely randomized design with three replications. Treatments were twelve lead concentrations from lead nitrate source (0, 10, 50, 100, 500, 1000, 1500, 2000, 2500, 3000, 3500, 4000 mg/kg soil). Results showed that decrease in vegetative traits fitted with segmented model when lead concentration increased. Also, chlorophyll a, b, a+b contents and SPAD index value declined about 23, 47, 30 and 22%, respectively. Chlorophyll a/b ratio (a/b) and carotenoid, however, showed increasing trend by 46 and 39% in 4000 mg/kg of soil as compared to the control. In addition, the activity of catalase, peroxidase and ascorbate enzymes increased until about 10, 447 and 18 mg/kg of soil, respectively and then decreased when lead concentration was increased. Superoxide dismutase activity in 4000 mg/kg of soil was about 2.3 times greater than the control. Also, malon-di-aldehyde (MDA) and H2O2 concentrations in 4000 mg/kg of soil were about two times and proline concentration was about 12% greater than the control. In conclusion, up to 100 mg/kg of soil vegetative traits and photosynthetic pigments particularly showed the highest sensitivity. Among photosynthetic pigments, the sensitivity of chlorophyll b was higher than chlorophyll a. Also, the higher activity of superoxide dismutase enzyme than the other enzymes and proline can be a possible reason for ameliorating the damage of high levels of lead in canola.

Vegetative growth, physiological and enzymatic responses of purslane medicinal plant (Portulaca oleracea) to cadmium concentrations the soil
Maryam Jenabiyan, Hemmatollah Pirdashti, Mohammad Ali Tajik Ghanbary, Fardin Sadeghzadeh,
Volume 9, Issue 38 (vol. 9, no. 38 2020)
Abstract

Cadmium is one of the most commonly used heavy metals in the contaminated areas which entered in the ecosystem and the food chains and will have ecological harmful effects on living organisms. Considering the risk of increasing heavy elements in agricultural soils and subsequent exposure to medicinal plants such as purslane (Portulaca oleracea L.), a factorial experiment was conducted in a completely randomized design with three replications. The aim of the presented study was to study the vegetative growth response and the physiological and enzymatic parameters of this medicinal plant in comparison with the increase of cadmium concentration (0 to 275 mg/kg) in the soil. The results showed that vegetative traits, photosynthetic pigments, soluble protein content and relative water content of leaf decreased with increasing cadmium concentrations while increased the levels of malondialdehyde, hydrogen peroxide and proline. Also, the changes in the activity of the three enzymes of peroxidase (POX), ascorbate peroxidase (APX) and superoxide dismutase (SOD) increased at lower levels of toxicity while decreased at higher levels. Purslane was more sensitive to higher levels of cadmium, so that gradient of more studied variables like dry weight of vegetative organs, the photosynthetic pigments, proline, soluble protein and hydrogen peroxide at low levels of cadmium (ranging from zero up to 60 mg/kg) was lower and then continued with a more slope. Overall, the results showed that the purslane medicinal plant has the ability to grow up to 275 mg per kg of cadmium in the soil. However, at concentrations higher than about 60 mg, the accumulation of dry matter and the functioning of the plants defense systems decreased by more than 50%.


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