Szerző szerinti böngészés "Garousi, Farzaneh"
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Tétel Szabadon hozzáférhető Accumulation of selenium in the main parts of crops grown in soils and hydroponics(2016) Garousi, Farzaneh; Kovács, Béla; Hankóczy Jenő növénytermesztési és kertészeti tudományok doktori iskolaSelenium (Se) is an essential nutrient for many organisms, but also toxic at higher levels. Se deficiency is one of the urgent questions. Around 15% of the world’s population is estimated as Se deficient in various degrees. Se is a vital component of aminoacids, selenoproteins, and selenium-binding proteins that can easily transform into aminoacids instead of sulphur (S). Among different Se supplementation options, diet is the principal route even for animals and humans. Most people obtain virtually all of their Se from the foods they eat. In plant and animal tissues, Se is found mostly bound to proteins. Considering the diet, plants have outstanding importance. They may be used both to provide dietary Se in areas of Se deficiency, and to clean up Se pollution from seleniferous areas. Plant foods are the major dietary sources of Se in most countries throughout the world, and Se imbalance in the soil-plant system can lead to production of Se-deficient food with negative consequences for human and animal nutrition. However plants don’t need Se to keep the normal metabolism, they can transform inorganic Se to organic selenoaminoacids and their derivatives. Beside the advantages for humans and animals, Se improves plant growth and other physiological parameters. Our new scientific results were: Sunflower has high Se accumulation capacity and has a high Se tolerance capacity in phytoremediation cultures and also as a Se-hyperaccumulator; by up taking near 1800 mg kg-1 (in range) in shoots can be a valuable plant for agricultural industry, phytoremediation processing and biofortification. 3 mg kg-1 of SeIV significantly increases green pea growth biomarkers and protein content in the leaves significantly by 17% and also selenomethionine (SeMet) is the major species especially in shoot and the only organic selenium form in lower SeIV concentration range. Elevated dosage of SeIV (≥30 mg kg-1) results inhibitive effects on growth and protein content and causes higher accumulation of inorganic Se in forms of SeVI and SeIV along with selenocysteine (SeCys2).Tétel Szabadon hozzáférhető Analysis of maize and sunflower plants treated by molybdenum in rhizobox experiment(2015-03-05) Bódi, Éva; Veres, Szilvia; Andrási, Dávid; Garousi, Farzaneh; Kovács, BélaIn this study, maize (Zea mays L. cv. Norma SC) and sunflower (Helianthus annuus L. cv Arena PR) seedlings treated by molybdenum (Mo) that were cultivated in special plant growth boxes, known as rhizoboxes. During our research we tried to examine whether increasing molybdenum (Mo) concentration effects on the dry mass and absorption of some elements (molybdenum, iron, sulphur) of shoots and roots of experimental plants. In this experiment calcareous chernozem soil was used and Mo was supplemented into the soil as ammonium molybdate [(NH 4 ) 6 Mo 7 O 24 .4H 2 O] in four different concentrations as follow: 0 (control), 30, 90 and 270 mg kg -1. In this study we found that molybdenum in small amount (30 mg kg -1 ) affected positively on growth of maize and sunflower seedlings, however, further increase of Mo content reduced the dry weights of shoots and roots. In case of maize the highest Mo treatment (270 mg kg -1 ) and in case of sunflower 90 mg kg -1 treatment caused a significant reduction in plant growth. In addition, we observed that molybdenum levels in seedling were significantly elevated with increasing the concentration of molybdenum treatment in comparison with control but the applied molybdenum treatments did not affect iron and sulphur concentration in all cases significantly.Tétel Szabadon hozzáférhető Arzénkezelés hatása kukorica és napraforgó csíranövények fiziológiai paramétereire(2015) Várallyay, Szilvia; Veres, Szilvia; Garousi, Farzaneh; Bódi, Éva; Kovács, BélaTétel Szabadon hozzáférhető Assessment and comparison of selenium-enriched maize with sodium selenite and sodium selenate(2016-02-18) Garousi, Farzaneh; Veres, Szilvia; Bódi, Éva; Várallyay, Szilvia; Kovács, BélaSelenium is an element of environmental interest owing to the narrow range between its nutritionally required and toxic concentrations in many organisms. Its mobility and bioavailability differ greatly depending on individual Se species. In this regard, in present study, the uptake and distribution of Se, the changes in Se content, and the effects of different concentration of Se in two forms of sodium selenite and sodium selenate on maize plants were measured in nutrient solution experiments to clarify their response to the two forms of Se. The results revealed that the Se content in shoots and roots of maize plants significantly increased as the Se level increased. Two Se forms behaved differently and the effects of toxic damage in samples which had been treated with selenite were much more than in the selenate treatments.Tétel Szabadon hozzáférhető Assessment and comparison of selenium-enriched maize with sodium selenite and sodium selenate(2016) Garousi, Farzaneh; Veres, Szilvia; Bódi, Éva; Várallyay, Szilvia; Kovács, BélaTétel Szabadon hozzáférhető Effect of arsenic on dry weight and relative chlorophyll content in greeningmaize and sunflower tissues(2015) Várallyay, Szilvia; Bódi, Éva; Garousi, Farzaneh; Veres, Szilvia; Kovács, BélaTétel Szabadon hozzáférhető Effect of arsenic treatments on physiological parameters of sunflower and maize plants(2015-03-05) Várallyay, Szilvia; Veres, Szilvia; Garousi, Farzaneh; Bódi, Éva; Kovács, BélaThe environment is contaminated with heavy metals and other toxic compounds. One of the most important toxic element is the arsenic (As). The objective of our study was to investigate the effect of As on fresh and dry weight of sunflower and maize in the early growth phases. Seedlings were grown in climate room on nutrient solution which were treated with 3, 10 and 30 mg kg -1 arsenic. The plants were treated separately with As(III) and As(V). After 14 day, changes in fresh and dry weight of maize shoots and roots were recorded. In the case of sunflower these parameters were measured after 21 day. The applied As(III) and As(V) decreased the fresh and dry mass of the shoots and roots of seedlings, especially at concentration 30 mg kg -1 . We can draw the conclusion that the treatments of the maize and sunflower roots with arsenic had negative effects on the biomass accumulation. We found that the sunflower plants are more sensitive to arsenic toxicity than maize plants, and all data demonstrate that the As(III) is more toxic to these plants than the As(V).Tétel Szabadon hozzáférhető Effect of selenite and selenate uptake by maize plants on specific leaf area(2015) Garousi, Farzaneh; Veres, Szilvia; Bódi, Éva; Várallyay, Szilvia; Kovács, BélaTétel Szabadon hozzáférhető Effects of molybdenum treatments on maize and sunflower seedlings(2015) Bódi, Éva; Veres, Szilvia; Garousi, Farzaneh; Várallyay, Szilvia; Kovács, BélaTétel Szabadon hozzáférhető Investigation of photosynthesis status of sunflower plants up-taking different forms of Selenium(2016) Garousi, Farzaneh; Kovács, Béla; Veres, SzilviaTétel Szabadon hozzáférhető Molibdénnel kezelt kukorica és napraforgó növények vizsgálata rizoboxos kísérletben(2015) Bódi, Éva; Veres, Szilvia; Andrási, Dávid; Garousi, Farzaneh; Várallyay, Szilvia; Kovács, BélaTétel Szabadon hozzáférhető Non-destructive and destructive measurements' chlorophyll content in sunflower and maize plants uptaken different chemical forms of selenium(2015) Garousi, Farzaneh; Veres, Szilvia; Kovács, BélaTétel Szabadon hozzáférhető Physiological reactions of sunflower plants to different spices of selenium(2015) Garousi, Farzaneh; Kovács, Béla; Bódi, Éva; Várallyay, Szilvia; Veres, SzilviaTétel Szabadon hozzáférhető Relative chlorophyll content changes during uptaking of selenite and selenate by maize plants grown in nutrient solution(2015) Garousi, Farzaneh; Kovács, Béla; Várallyay, Szilvia; Bódi, Éva; Veres, SzilviaTétel Szabadon hozzáférhető Role of selenite and selenate uptake by maize plants in chlorophyll A and B content(2015) Garousi, Farzaneh; Veres, Szilvia; Bódi, Éva; Várallyay, Szilvia; Kovács, BélaTétel Szabadon hozzáférhető The toxicity of different selenium forms and compounds: Review(2015) Garousi, FarzanehTétel Szabadon hozzáférhető The toxicity of different selenium forms and compounds – Review(2015-03-05) Garousi, FarzanehSelenium (Se) is an unusual metalloid of considerable interest from both a toxicological and a nutritional perspective, with a very narrow safe range of intake. Although there are many reports about its detoxification properties, toxicity aspects of it have also been tracked for several decades. Lots of studies demonstrated that low Se is an efficacious avail whereas high Se can induce toxicity and the significant toxicity of selenium emphasizes the need to assess the health risk of various selenocompounds as nutritional supplements. The toxicity of different forms and compounds of selenium is also summarized in this review.