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Showing 2 results for Sedaghat
Dr Ebrahim Sedaghati, , , , ,
Volume 22, Issue 4 (Winter 2021)
Abstract
Micropropagation is a method for mass and rapid proliferation of plants on tissue culture media. Low survival and poor growth of micropropagated seedling after transplanting is one of the main disadvantages of this technique in many plants. The success of this method can be increased by using biological agents such as arbuscular mycorrhizal fungi. The experiment was conducted to evaluate the efficiency of arbuscular mycorrhizal fungi to improve physiological indices and osmotic regulators content of micropropagated pear rootstock (Pyrodwarf) under drought stress. Factorial experiment was performed in a completely randomized design with two factors (two mycorrhizal and three drought stress level). Experiment was conducted in three replications under greenhouse conditions. Drought stress continued for two months. Results of analysis of variance showed that mycorrhizal symbiosis significantly increased physiological parameters and decreased osmotic regulators at all levels of drought stress. Mycorrhizal colonization percentage determined as 84, 81.66 and 72%, in low, medium and severe drought stresses levels, respectively. Mycorrhizal application significantly increased physiological indices such as Fv/Fm, photosynthetic efficiency index, SPAD index, and the content of chlorophyll b, cartenoid and total chlorophyll in mycorrhizal treatments compared to control (no mycorrhizal plants) and decreased proline and soluble sugars content. Overall, the results of this experiment showed that rootstocks obtained from tissue culture treated with arbuscular mycorrhizal fungi were more adapted to natural conditions and drought stress.
Mohammad Hasan Movahedi, Saeid Eshghi, Majid Rahemi, Ahmad Raofi, Sahar Sedaghat,
Volume 23, Issue 4 (Winter 2022)
Abstract
In order to evaluate the effects of potassium sulfate and nanopotassium fertilizers on two pistachio cultivars under salinity stress a factorial experiment was conducted in a completely randomized design with four replications. Treatments were three levels of salinity (0.5, 8 and 12 dSm-1) and potassium sulfate fertilizer (1 and 2%) and nano–potassium fertilizer (1 and 2 g L-1). The results showed that Akbari cultivar had the highest total chlorophyll, root potassium and proline contents compared with AhmadAghaei cultivar. The highest chloropyll conten was observed in Akbari cultivar under 0.5 dSm-1 NaCl by application of 2 g L-1 nano–potassium fertilizer. The lowest root sodium content was belonged to Akbari cultivar at 0.5 dSm-1 salinity stress with application of 1% sulfate potassium fertilizer. The minimum and maximunm content of proline was related to the salinity of 0.5 dsm-1 in AhmadAghaei cultivar and 12 dSm-1 in Akbari cultivar, respectively. The highest proline content was obtained by application of 2 g L-1 nano–potassium fertilizer. Application of potassium fertilizers reduced the adverse effects of salinity on pistachio seedlings.
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