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Peyman Ashkavand, Masoud Tabari, Mehrdad Zarafshar,
Volume 1, Issue 1 (9-2014)

Undoubtedly, identifying and introducing drought resistant species for reforestation of the Zagros forests should be considered by forest specialists.,the current research identified mechanisms of drought tolerance in Hawthorn (CrataegusaroniaL.) and Mahaleb (Prunusmahaleb L.) seedlings in a greenhouse experiment using a completely randomized design. The experiment contained 3 stress treatments with 5 replications each. The treatments were soil moisture as control (based on field capacity), moderate stress (based on 50% field capacity) and severe stress (water withholding). Our findings showed that relative water content and stem water potential decreased in both species with increasing of drought severity. Although the total chlorophyll content was no affected by drought stress, carotenoid content was declined in response to the stress. Proline and total soluble carbohydrate concentration, as osmotic adjustments, increased in both species. According to electrolyte leakage and malondialdehyde results, we concluded that Hawthorn can tolerate moderate and gradual drought stress by the means of some adaptations but accidental water withholding stress leads to oxidative stress in this species. On the other hand, although moderate and gradual drought stress leads to oxidative stress on the Mahaleb, but accidental water withholding stress did not have the same course of negative effect as it had on Hawthorn.
Zeinab Javanmard, Masoud Tabari Kouchak Saraei, Fatemeh Ahmadloo,
Volume 2, Issue 2 (3-2016)

In order to study the effect of storage temperature and hormonal concentration on stored seed germination and early growth of Pinus nigra var. caramanica, an experiment including 3 factors in the context of Complete Randomized Design (CRD) with 3 replications was carried out. The seeds were stored for three years at two temperature conditions (refrigerator temperature 4 ºC and room temperature 20-25 ºC). In this way, the seeds were soaked in gibberellin acid (GA3) and benzyl amino purine (BAP) at concentrations of 0, 50, 100, and 200 mg l-1 for 24 h and kept out in germinator (20 °C) for 40 days. In general, both hormonal solutions improved germination traits. The highest germination percentage, germination rate, germination energy, seedling length, seedling dry weight, and vigor index were obtained in refrigerator temperature and at concentrations of 200 mg l-1 GA3 and 50 mg l-1 BAP, and in room temperature at 200 mg l-1 BAP and 50 mg l-1 GA3. It is recommended that in nurseries of semi-arid and semi-humid regions, in the absence of refrigerator, the seeds of P. nigra var. caramanica would be better to store in the room temperature for three years.

Morteza Rooki , Masoud Tabari Kouchaksaraei , Seyed Ehsan Sadati ,
Volume 3, Issue 2 (3-2017)

Background and objectives: Mediterranean Cypress (Cupressus sempervirens var. fastigiata) is a native, evergreen species. Due to its various merits, particularly its wide use in parks and urban green spaces, it is of interest in most climatic regions of Iran, including Zagros provinces. Due to the poverty of soil and limitation in water sources, the production of seedlings of this species has become particularly problematic in some of these regions. By using rhizobacteria Pseudomonas fluorescens inoculation in soil, for the first time, the present study aims to determine the resistance and variations of growth characteristics of seedlings under water deficit conditions.
Materials and methods: The experiment was conducted as a factorial, using a completely randomized design with two treatments (i.e., with rhizobacteria and without rhizobacteria), different watering levels (3, 6, 9 and 12 days) in three replicates. After 5 months, growth characteristics of seedlings were measured.
Results: Increasing the watering period (water deficit) caused to significantly decrease the survival, diameter, shoot biomass and total biomass, so that all seedlings were died under 12-day watering level. In watering period of 9 days, survival was reduced to 49.83 percent. There was no significant difference in collar diameter, root length, root volume and root/shoot biomass with water deficit intensity. However, the survival rate, height growth, shoot biomass, root biomass, total biomass and seedling quality index were greater in seedlings inoculated with rhizobacteria, compared with those of non-inoculated seedlings.
Conclusion: The seedlings of Mediterranean Cypress inoculated with Pseudomonas fluorescens rhizobacteria are able to tolerate the water deficit stress and increase their growth performance; however, under optimal conditions, the rhizobacteria inoculation has no positive effect on survival rate of the seedlings.

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