نوع مقاله : پژوهشی
نویسندگان
1 دانشگاه محقق اردبیلی
2 دانش آموخته ارشد، گروه علوم باغبانی، دانشکده کشاورزی، دانشگاه محقق اردبیلی، ایران.
3 دانشیار گروه باغبانی، دانشکده کشاورزی، دانشگاه محقق اردبیلی، ایران
4 دانش آموخته دکتری، گروه علوم باغبانی، دانشکده کشاورزی، دانشگاه ارومیه، ایران
5 استادیار، گروه باغبانی، دانشکده کشاورزی، دانشگاه محقق اردبیلی، ایران
چکیده
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Abstract
Background and objectives:
Cadmium is considered one of the most important pollutants in the environment, which causes serious damage to living organisms and the organisms that feed on them. Agricultural land contaminated with cadmium is a big problem. Because this metal is easily absorbed by the roots of plants and can be transferred to the aerial parts. Increasing the tolerance of plants to biotic and abiotic stresses is a debatable and important issue that is discussed more than ever before. Selenium is one of the elements that can be used to adjust the stress in plants. Selenium can play a role in reducing the stress effects of heavy metal toxicity in soil.
Materials and methods:
This research was carried out in the research greenhouse of Mohaghegh Ardabili University, in a factorial experiment based on completely randomized design with two factors and four replications under hydroponic cultivation conditions. The first factor included the application of cadmium metal in food solution at three concentrations (zero, 30 and 60 µM) and the second factor was spraying with selenium at three concentrations (zero, 75 and 150 µM).
Results:
The results showed that parameters such as leaf dry weight, number of leaves, stomatal conductance and chlorophyll decreased with increasing cadmium concentration, while parameters such as electrolyte diffusion, malondialdehyde and soluble sugars increased. So that the highest amount of leaf dry weight (4.1 gr), number of leaves (20.08), stomatal conductance (26.72), total chlorophyll (0.221), electrolyte leakage (76.45), malondialdehyde (0.072), soluble sugar (0.83) were obtained under cadmium-free conditions and at 60 μM cadmium concentration, respectively. Also, the results related to effect of the two mentioned factors showed that the highest relative content of RWC (65.95%), chlorophyll (0.18 mg/g FW) was obtained in the treatment without cadmium stress and the application of foliar spraying of 150 µM selenium, respectively. Also, selenium moderated stress and effects of stress in plants that were under heavy metal stress, so that the greatest effect of selenium foliar application was in high concentrations of heavy metal stress of cadmium.
Conclusion:
In this study, it was tried to investigate the effects of selenium in modulating the toxicity of the heavy metal cadmium in lettuce plants from different aspects, and according to the results of this research, it can be concluded that cadmium toxicity causes disturbances in growth, physiological and biochemical characteristics in the growth of the lettuce plant is improved, and the use of selenium foliar spraying improved the growth characteristics and performance of the lettuce plant, and also reduced and moderated the effects of the heavy metal cadmium in the lettuce plant.
کلیدواژه‌ها [English]
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