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Showing 2 results for Adaptation
Dr Mohsen Pirmoradian, Dr Hassan Hajnajari, Eng Ghasem Hassani,
Volume 19, Issue 2 (7-2018)
Abstract
Viral diseases affect tree vegetative traits, yield and fruit quality. To shorten the import process of new apple cultivars for establishment of mother orchards, a group of virus-controlled scion-rootstock combinations imported from Italy were transferred and cultivated in Semirom Hort. Station (Isfahan), after the end of quarantine. This project was achieved for the regional adaptation trial investigating qualitative and quantitative characteristics and also comparing imported virus controlled combinations and infected Red Delicious and Golden Delicious on M9. In the present study, the comparison of growth related traits in each cultivar- rootstock combinations at 94, 95 and 96 years, and yield and quality traits of fruit were measured in 94, 95 years. The experiment was carried out based on randomized complete block design with three replications. Each combination was taken as a treatment, also combined with two and three years of data analysis. Assuming growth traits of annual branch growth, tree height, crown width, trunk diameter and leaf length and width it was shown that Jonagold and Gala on M9 had the highest growth. The results showed that the highest tree height was attributed to Jonagold, Red Chief and Gala on M9 in a descendant order but the least height was seen in Red Delicious-M9 combination. The most prominent crown width were observed in two combinations of Jonagold-M9 and Golden Delicious-MM106 with the least presented by Red Delicious and Golden Delicious on M9. Highest leaf chlorophyll content (SPAD) was found in Jonagold-M9 and Red Chief-M9, but the least rates was registered in the leaves of Golden Delicious and on Red Delicious on M9. Virus control combinations have higher values of vegetative properties compare to the contaminated combinations.
Dr Ebrahim Sedaghati, , , , ,
Volume 22, Issue 4 (12-2021)
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.
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