N. Omidpanah; A. Moradshahi; Z. Asrar
Abstract
Zhumeria majdae Rech. has been used as traditional medicine in southern part of Iran. Essential oils and extracts from different parts of the plant have allelopathic effects. Present study investigated allelopathic effects of Zhumeria majdae Rech. essential oil on germination percentage, pigment content ...
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Zhumeria majdae Rech. has been used as traditional medicine in southern part of Iran. Essential oils and extracts from different parts of the plant have allelopathic effects. Present study investigated allelopathic effects of Zhumeria majdae Rech. essential oil on germination percentage, pigment content (chlorophyll and carotenoid) and antioxidant enzymes (catalase and Guiacol Peroxidase) activities on two wheat cultivars, Azar2 and Sardari. Plants were grown in perlite and the 10- days treated plants were used for the measurements. Different concentrations of the essential oil were obtained by 2.5% Arabic Gum solution. Distilled water and 2.5% Arabic Gum solution were used as control. Results indicated that germination percentage, pigment content, and the two antioxidant enzymes activities of the species treated with Arabic Gum were equal to those of the species treated with distilled water. With increasing essential oil concentration, in both cultivars, the germination percentage and chlorophyll content decreased and the carotenoid content increased. In the presence of essential oil, catalase activity increased slightly in both cultivars. In conclusion, it could be stated that incremnet of pigment content and antioxidant enzymes activities reduce their harmful effects on growth and development of the species through lowering the Reactive Oxigen Species (ROS) concentration.
Sh. Hashemi; Z. Asrar; Sh. Pourseyedi
Abstract
Lepidium sativum L. is known as a medicinal plant. This plant is regarded as a cure for breast cancer due to antioxidant properties. The availability of manganese (Mn) in plants is governed by redox processes which depend upon pH and the presence of electrons. Excess Mn disturbs the ...
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Lepidium sativum L. is known as a medicinal plant. This plant is regarded as a cure for breast cancer due to antioxidant properties. The availability of manganese (Mn) in plants is governed by redox processes which depend upon pH and the presence of electrons. Excess Mn disturbs the metabolism of plants and inhibits the plant growth and oxidative stress is also induced which leads to the formation of reactive oxygen species (ROS) including superoxide, hydroxyl and hydrogen peroxide that could damage plant cells. Salicylic acid (SA) is a natural signal molecule which plays an important role in regulating a number of physiological processes and plant resistance to biotic and abiotic stresses. The protective function of SA includes the regulation of ROS, antioxidants, induction of gene expression, absorption and distribution of elements. In this investigation, the effects of different levels of salicylic acid (0, 0.01, 0.05, 0.1mM) on different concentrations of Mn (0, 250, 500, 800µM) were studied on Lepidium sativum. Results showed that addition of SA (0.01, 0.05, 0.1mM) improved the inhibition of induced calcium and magnesium uptake. Ascorbare content in leaf was increased by SA (0.01, 0.05, 0.1mM) but decreased by concentrations of 500 and 800 µM Mn. The proline content significantly increased in treatments of Mn and SA. The protein content decreased by 500 and 800 µM but the treatment of SA (0.01, 0.05, 0.1mM) increased the protein content under conditions of manganese toxicity.