Khiermohammad Mohammadi; Ali Ebadi; Mohammad Ali Askari Sarchishmeh; Mohammad Reza fattahi Moghaddam; Hossein Hokmabadi
Abstract
Plants employ antioxidant mechanism to face different stresses. In this research work the effect of salinity stress, caused by increasing sodium chloride, on the antioxidative system and some physiological characteristics of selected pistachio seedlings (Badami-Riz-e- Zarand, Qazvini, Sarakhs, Atlantica ...
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Plants employ antioxidant mechanism to face different stresses. In this research work the effect of salinity stress, caused by increasing sodium chloride, on the antioxidative system and some physiological characteristics of selected pistachio seedlings (Badami-Riz-e- Zarand, Qazvini, Sarakhs, Atlantica UCB1, and Hybrids of Pistacia. vera cv. Badami-Riz-e-Zarand × P. Integerrima, P. vera cv. Sharakhs× P. Integerrima, P. atlantica Desf. × P. Integerrima ) was studied. A greenhouse experiment was conducted as a factorial based on a completely randomized design with three replications in Cocopit and Perlite media. Treatments consisted of four salinity levels (0, 75, 150 and 225 mM NaCl) and above mentioned Root stocks. Using salt in nutrient solution was carried out in the second year of seedling growth for nine weeks. At the end of experiment, some physiological and biochemical traits of seedlings were measured. Results showed that, leaf area and total chlorophyll contents decreased in all treated plants. Under the salinity stress, a higher reduction in the observed traits was noticed in the Atlantica rootstock while less effect on the Badami-Riz-e-Zarand was noticed. Also, it has been found that by increasing salinity levels the levels of proline, total phenol content and antioxidant enzymes activity were higher in Badami-Riz-e-Zarand × P. Integerrima, Badami-Riz-Zarand and Qazvini compared to others. It seems that Hybrid of Badami-Riz-e-Zarand × P. Integerrima, Badami-Riz-Zarand and Qazvini rootstocks had more ability to sustain leaf water and proteins and therefore, were more resistant to salinity stress.
Mohsen Seilsepour; Ahmad Golchin; Mahmoud Reza Roozban
Abstract
A greenhouse experiment was carried out to evaluate the effects of salinity stress on growth and macroelements contents of two olive varieties in soilless culture medium. In the research, one-year old saplings of two olive varieties, ‘Zard’ and ‘Mission’, were subjected to different ...
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A greenhouse experiment was carried out to evaluate the effects of salinity stress on growth and macroelements contents of two olive varieties in soilless culture medium. In the research, one-year old saplings of two olive varieties, ‘Zard’ and ‘Mission’, were subjected to different salinity levels induced by NaCl including 0, 4, 8, 12 and 16 dS/m-1 for 5 months. Based on the results, total dry weights of the varieties were decreased at 16 dSm-1 compared to control up to 63 and 85% at ‘Mission’ and ‘Zard’, respectively. Also, a 25% reduction in total dry weight was observed under salinities of 7 and 3.6 dSm-1 for ‘Mission’ and ‘Zard’, respectively. Salinity was decreased the concentrations of macronutrients and increased the concentrations of Na and Cl in roots and leveas of the both varieties. Compared to control, Na and Cl concentrations in leaves and roots was increased under salinity of 16 dS/m-1 at 1660 and 679% for Na and 1069 and 506% for Cl. In all salinity levels, Na and Cl concentrations in the leaves and roots of 'Zard' variety were more than that of 'Mission'. Thesa data demonstrated that ‘Mission’ has a more salinity tolerance than ‘Zard’, and could be used as a salt-tolerant variety for cultivation under salinity conditions. The defence mechanisms of ‘Mission’ are restricting in absorbtion and translocation of Na to aerial parts and accumulate a proper concentration of K in Leaves.