Maryam Palizdar; Reza Tavakkol Afshari; Ziba Jamzad; Mohammadreza Ardakani; Parisa Nejat Khah
Abstract
This research was carried out to evaluate the germination response of eleven Salvia species to application of Gibberellic acid (GA3) and pre-chilling treatments in the Iran Research Institute of Forests and Rangelands during 2012. Germination responses of the seeds were investigated under control treatment, ...
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This research was carried out to evaluate the germination response of eleven Salvia species to application of Gibberellic acid (GA3) and pre-chilling treatments in the Iran Research Institute of Forests and Rangelands during 2012. Germination responses of the seeds were investigated under control treatment, 2-levels of Gibberellic acid (GA3) treatments with 500 mg/L (for 24 and 48 hours) and 2-levels of pre-chilling treatments at 4°C (for 2 and 4 weeks). The germination percentage and rate, as the physiological traits of the species, were studied based on a completely randomized design with four replications. Based on the results, applying the Gibberellic acid (GA3) treatment for 24 hours increased both the germination percentages and rates as compared to control; but the treatment for 48 hours was insignificantly changed the two mentioned parameters comparing to control. On the other hand, the pre-chilling treatment of seeds for 2 weeks also caused a significant increase in the above parameters as compared to the control treatment; while they were insignificantly different from the control treatment by the use of pre-chilling treatment for 4 weeks.
Abbas Hashemi; F. Sharifzadeh; Reza Maali Amiri; Reza Tavakkol Afshari
Abstract
Safflower (Carthamus tinctorius L.) is an important industrial plant, which classified in the category of oil plants. The tolerance of plants to drought is different, as well as Plants have different temperature and water requirements, and understanding this requirement helps them survive and reproduce. ...
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Safflower (Carthamus tinctorius L.) is an important industrial plant, which classified in the category of oil plants. The tolerance of plants to drought is different, as well as Plants have different temperature and water requirements, and understanding this requirement helps them survive and reproduce. Therefore, the purpose of this study was to evaluate the germination characteristics of safflower seeds at different temperatures and humidity and the adaptation power of this plant under these conditions. For this purpose, germination of safflower seed (Faraman cultivar) was investigated in incubator at constant temperatures of 5, 10, 15, 20, 25, 30, 35 and 40 ° C. in this study, 3 regression model including, Beta model, Dent like model and segmented model were used to determine cardinal safflower temperatures. Then, to investigate germination and seedling growth response of Carthamus tinctorius toward different levels of Water Deficite Stress at an optimum temperature, another test was conducted. in this experiment, seed germination was assessed in six levels of Water Deficite Stress with the osmotic potential of 0, -3, - 5, -7 and -9 bar (in temperatures of 20 ° C). Based on Beta model, Dent like model and segmented model, the cardinal temperatures of Carthamus tinctorius seeds germination including, (Tbase, Topt and Tmax) were: (4.6, 4.1, 4.1), (22.02, 20 – 24.3, 22.5) and (43.3, 50.3, 50.3) °C, respectively.
Roksana Nazari; soheil parsa; Reza Tavakkol Afshari; sohrab mahmodi
Abstract
In order to investigate the effect of priming on the improvement of physiological indices of antioxidant enzymes in soybean seeds, a factorial experiment was conducted in a completely randomized design with three replications at the Seed Science and Technology Laboratory of Tehran University in 2017. ...
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In order to investigate the effect of priming on the improvement of physiological indices of antioxidant enzymes in soybean seeds, a factorial experiment was conducted in a completely randomized design with three replications at the Seed Science and Technology Laboratory of Tehran University in 2017. The factors studied included two levels of deterioration (48 and 72 hours), three levels of salicylic acid (0, 300, 600 μM) and three times the salicylic acid application (before decay, post-fall, before and after deterioration). The traits measured included antioxidant enzymes (glutathione redactase, superoxide dismutase, catalase, peroxidase, ascorbate peroxidase, glutathione peroxidase, membrane peroxidation or malondialdehyde). The results showed that deterioration level increasing, decrease the antioxidant enzymes activity and increase membrane peroxidation and soybean seed priming with salicylic acid hormone restore the decayed seeds and increase the activity of antioxidant enzymes. The highest activity of ascorbate peroxidase activity was observed at 72 hours with the time of salicylic acid application before and after deterioration at a concentration of 300 μm and 6.98. Reduction of malondialdehyde leakage rate when combined with 300 μM concentration of salicylic acid Was observed at 1.45. The results also showed that the priming at the same time improves the chemical properties of the seeds in the deterioration.
