Fahimeh Mohammadpour; Farhad Ghasemi Aghbash; Mehrdad Zarafshar; Ehsan Ghanbary
Abstract
The purpose of the current study was to investigate the effect of carbon nanotubes on morphological traits of two wild pistachio species and compare them with common treatments including cold and acid sulfuric 65% in a completely randomized design with eight treatments and 10 replicates. The results ...
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The purpose of the current study was to investigate the effect of carbon nanotubes on morphological traits of two wild pistachio species and compare them with common treatments including cold and acid sulfuric 65% in a completely randomized design with eight treatments and 10 replicates. The results showed that application of carbon nanotubes with concentrations of 25 and 75 mg / L significantly improved the morphological and biomass traits of the two species of wild pistachio including (Pistacia atlantica Desf ) and (P. khinjuk Stocks) in comparison with the acid and cold treatments. The highest increase in root, stem height and collar diameter was observed in the 25 mg / L treatment. The highest root length and dry and fresh root biomass were observed in Khinjuk under 75 mg/L nano carbon treatment. The highest concentration of leaf magnesium was observed in P. atlantica after 10 and in P. Khinjuk after 100 mg/L treatments. The phosphorus content in leaves of the two wild pistachio species was stable under the all treatments. The leaf potassium in P. atlantica was the highest under 10, 25, and 50 mg/L treatment and it was the highest in leaves of P. Khinjuk under 75 mg/L treatment. Although the current research proved the positive impacts of carbon nanotubes on growth of the wild Pistachio species, the further research can be suggested to find strategies for enhancing the growth of wild pistachio species to commercialize the products of these valuable species.
Mehrdad Zarafshar; Moslem Akbar nia; Sayed Mohsen Hosaini; Ali Sattarian; Maryam Niyakan
Abstract
Using of Nano-materials is one of the suitable ways for increasing of abiotic resistance in plants. In the current research, wild pear seedlings were irrigated with different concentrations of TiO2 and SiO2 NPs such as 0, 10, 100, 500 and 100 mgL-1. After this pretreatments, irrigation was stopped for ...
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Using of Nano-materials is one of the suitable ways for increasing of abiotic resistance in plants. In the current research, wild pear seedlings were irrigated with different concentrations of TiO2 and SiO2 NPs such as 0, 10, 100, 500 and 100 mgL-1. After this pretreatments, irrigation was stopped for 14 days to induce drought stress on the seedlings. At the end of the experiment, relative water content, xylem water potential, root biomass, electrolyte leakage rate, proline content and catalase enzyme activity were measured. The results showed that although both types of nanoparticles were differentially absorbed by roots of wild pear seedlings, the amelioration of water deficit in terms of all studied variables were observed for both of NPs with a slight differences between them. SiO2 NPs was more successful in improving root biomass and relative water content. On the other hand, TiO2 NPs was more successful in improving xylem water potential and catalase activity. Finally, amelioration effects of both NPs were clearly proved by the current research but further experiments are advised to find out involved mechanisms.
Peyman Ashkavand; Masoud Tabari koucheksraei; Mehrdad Zarafshar; Ehsan Ghanbary
Abstract
In order to assess the impact of silicon nanoparticles in improving the growth and physiology characteristics of mahaleb cherry (Prunus mahaleb L.) seedlings a completely randomized experimental design was carried with 4 treatments and 3 replications (each replicate with 9 seedlings). Irrigation treatments ...
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In order to assess the impact of silicon nanoparticles in improving the growth and physiology characteristics of mahaleb cherry (Prunus mahaleb L.) seedlings a completely randomized experimental design was carried with 4 treatments and 3 replications (each replicate with 9 seedlings). Irrigation treatments included concentrations of 10, 50 and 100 mgr/L of silicon nanoparticles and control with tap water which was irrigated every three days based on field capacity. At all concentrations of silicon nanoparticls with increasing silicon nanoparticles concentration the rates of photosynthesis, stomatal conductance and transpiration increased. With increasing silicon nanoparticle concentration water potential of mahaleb seedlings was decreased (more negative), but the relative water content of leaves did not differ among treatments. Although, with increasing silicon nanoparticles, collar diameter and height growth did not differ, however, other growth parameters were increased. In general, it can be stated that in this study the use of silicon nanoparticles, especially at concentrations of 50 and 100 mgr/L growth and physiological activities of mahaleb seedlings were improved.
Mehrdad Zarafshar; Moslem Akbarinia; Hosain Asgari; Saeed mohsen Hosaini; mehdi rahaee
Abstract
One of the best solutions to overcome drought stress is the use of wild germplasm. We aim to understand how wild pear (Pyrus boisseriana) conserves water and recovers water potential after drought. After 18 days without water, which coincides with leaf rolling, we surveyed physiological and biochemical ...
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One of the best solutions to overcome drought stress is the use of wild germplasm. We aim to understand how wild pear (Pyrus boisseriana) conserves water and recovers water potential after drought. After 18 days without water, which coincides with leaf rolling, we surveyed physiological and biochemical parameters of pear seedlings and were re-surveyed them again after a week of re-watering. After signs of leaf rolling, the relative water content decreased to a critica level (35%).In contrast to the control, RWC declined by 58% and recovered acceptably. By the end of the experiment, xylem water potential declined -2.22 Mpa, but increased watering. For osmosis adjustment in the plant cell, free proline and glucose content was increased about 5-6%. The finding showed that increasing carotenoid content is one of the strategies in response to oxidative stress, because active oxygen species could not decrease chlorophyll content. On the other hand, MDA and H2O2 content as lipid peroxidation and oxidative stress indicator respectively narrowly increased. Finally it can be concluded that increasing the carotenoid and proline content are the important mechanism for water limiting stress. It seems that this wild pear germplasm can tolerate lack of water for about 18 days. Moreover, leaf rolling sign is a good indicator of drought resistance potential.
Eman Chaplagh paredary; Gholam ali Jalali; Ali Sunboli; Mehrdad Zarafshan
Abstract
Carpinus betulus is an important element in the Hyrcanian forests that extensively are distributed, therefore comprehensive studies on separation of phenotypes of the species is necessary. Most taxonomists approved the significance of the seed and bract traits in the taxonomy of the Carpinus so in this ...
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Carpinus betulus is an important element in the Hyrcanian forests that extensively are distributed, therefore comprehensive studies on separation of phenotypes of the species is necessary. Most taxonomists approved the significance of the seed and bract traits in the taxonomy of the Carpinus so in this study these traits was utilized to identify different phenotypes of the C. betulus by 26 seed and bract characters. First multivariate analysis such as Cluster Analysis were used. Accuracy of the clustering was determined by Discriminate Analysis. Most important traits for groupings were surveyed by Wilks' Lambda values. The results showed the length of three lobes of bract had the most contribution in separation of the clusters. However some traits such as length , width and the ridge numbers o the seed are suitable in separation of the phenotypes. Also, examining the bract stomatal traits in different groups, showed this character-was efficient in identifying the different phenotypes. Additionally, we compared the results of this research with previously reportedvarieties of Carpinus betulus and we observed more variation than the prior studies. In fact this study showed extensive variability of Carpinus betulus especiallyin seed and bract characters, proving the taxonomy significance of these traits.
