M. Ghorbanli; A. Sateyi; H. Kaboli Qarehtapeh
Abstract
Mistletoe is an evergreen, perennial and epiphytic plant of Loranthaceae which obtains all of its required water and nutrients such as Nitrogen and a small part of the food from the host plant by a root-like organ called "Haustorium". This plant is very important in terms of medical and pharmaceutical ...
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Mistletoe is an evergreen, perennial and epiphytic plant of Loranthaceae which obtains all of its required water and nutrients such as Nitrogen and a small part of the food from the host plant by a root-like organ called "Haustorium". This plant is very important in terms of medical and pharmaceutical and some of its effects in the treatment of many diseases have been proved. Two species of "Viscum album L." and "Arceuthobium oxycedri (D.C.) M. Bieb." both from the family Viscaceae are epiphytic plants. The dominant hosts of Viscum album L. in Gorgan forest are Parrotia persica (D.C.) C.A.Mey and Carpinus betulus L. respectively in altitude of 700 m and 1800m (above sea level). The host of Arceuthobium oxycedri (D.C.) M. Bieb is Juniperus polycarpus L in 2200m (above sea level). In this study, leaves and twigs of mistletoe and the host were collected. Three infected hosts from each species and three uninfected trees as control with similar conditions of diagonal and height were randomly selected, and the effects of these epiphytes on activity of antioxidant enzymes of the host plants, including Catalase, Peroxidase and Ascorbate peroxidase, were studied. The results showed that the infection of epiphyte caused drought stress in host plant and the activity of these enzymes was increased. The activity of Catalase in infected and uninfected hosts of V.album (P. persica and C. betulus) did not show significant differences, but in host of A. oxycedri (J. polycarpus) in male and female trees significant differences were observed. Activity of Ascorbate peroxidase and Peroxidase was significantly increased in all of infected hosts. But in none of the samples, activity of these enzymes was not dependent on the genus.
M. Ghorbanli; F. Ahmadi; A. Monfared; Gh. Bakhshi Khaniki
Abstract
Ascorbate as a strong antioxidant has a considerable bio effect on growth of plants, such as increase in their tolerance against environment stresses. In this investigation, the effect of salt stress and its interaction with ascorbate on amount of proline, catalase and ascorbate peroxidase enzymes and ...
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Ascorbate as a strong antioxidant has a considerable bio effect on growth of plants, such as increase in their tolerance against environment stresses. In this investigation, the effect of salt stress and its interaction with ascorbate on amount of proline, catalase and ascorbate peroxidase enzymes and MDA in a medicinal plant of Cuminum cyminum L. was randomly studied in the green house conditions with three replications. Plants were treated by different concentrations of NaCl (0, 25, 50, 75, 100, 125 mmolar) and ascorbate (9 mmolar). In the plants treated with salt, the amount of proline, antioxidant enzymes activity and MDA were increased with increasing NaCl concentrations. The plants treated with NaCl and ascorbate at the same time in a same NaCl concentration, the amount of proline, catalase activity, ascorbate peroxidase and MDA were increased. The results indicated that the ascorbate was one of the antioxidants that caused an increase in resistance of Cuminum cyminum L. to salt stress.
M. Ghorbanli; Gh. Bakhshi Khaniki; A. Zakeri
Abstract
Water deficit is one of the most important factors affecting the growth of plants. In this research, Linum usitatissimum L. seeds were sown in plastic pots containing sand, clay and peat (2: 1: 1). When the third leave was appeared, water stress was done at three levels of control, 1/3 field capacity ...
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Water deficit is one of the most important factors affecting the growth of plants. In this research, Linum usitatissimum L. seeds were sown in plastic pots containing sand, clay and peat (2: 1: 1). When the third leave was appeared, water stress was done at three levels of control, 1/3 field capacity and 2/3 field capacity for 10 days in three duplication on the basis completely randomized design. The amount of carotenoid, anthocyanin, flavonoid, phenolic compound and proline was measured to study the effect of drought stress on non-enzymatic defense mechanisms. Data were subjected to analysis of variance by SPSS statistical software and means were compared by Duncan's test at p ≤ 0.05 significance level. It is noteworthy to state that proline accumulation in aerial parts of the Linum was more than that of the root. The results showed that the amount of praline, phenolic compound and anthocyanin significantly increased but the amount of flavonoid in 2/3 FC increased and then slightly decreased however it increased as compared with the control. In the current study, the amount of carotenoid in the leaves of Linum significantly decreased.
