Fariba Rezaei Aderyani; Ayatollah Rezaei; Yavar Sharafi
Abstract
Salinity is one of the most important plant growth limiting factors, which using the anti-stress materials is considered as an important approach in moderating its effects on plants. In this research, the date plum seedlings response to salinity stress and two compounds putrescine and chitosan to reduce ...
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Salinity is one of the most important plant growth limiting factors, which using the anti-stress materials is considered as an important approach in moderating its effects on plants. In this research, the date plum seedlings response to salinity stress and two compounds putrescine and chitosan to reduce salinity stress was studied. The experiment was conducted as a factorial with three levels of sodium chloride (0, 30 and 60 mM), and five treatments of control, putrescine (1 and 2 mM) and chitosan (0.25 and 0.5%), based on a completely randomized design with four replications at Shahed University in 2016. The results showed that date plum was sensitive to salt stress in the early stages of growth and sodium chloride salinity stress resulted in significant decrease in vegetative traits such as fresh matter weight and length of shoots and roots as well as leaf chlorophyll content in compared to 0 salinity. In addition, the leaf blight percentage, sodium content, electrolyte leakage and malondialdehyde content were increased in plants treated with salinity. Putrescine treatment, especially at 2 mM concentration effectively reduced the effects of salinity on date plum seedlings and improved vegetative growth of stem and root, while chitosan had no significant effect in reducing the harmful effects induced by salt stress in this experiment. According to the results, Diospyros lotus seedlings were sensitive to salinity and using treatments such as putrescine is effective in increasing its resistance to salinity stress.
Ali Akbari; Orang Khademi; Yavar Sharafi; Seyed Jalal Tabatabaei
Abstract
Strawberry is sensitive to salinity stress. This experiment was conducted as factorial based on RCBD design to investigate the effects of putrescine treatments on reducing harmful effects of NaCl salinity stress in strawberry at Shahed University in 2015. NaCl treatments, 0, 25 and 50 mM, were applied ...
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Strawberry is sensitive to salinity stress. This experiment was conducted as factorial based on RCBD design to investigate the effects of putrescine treatments on reducing harmful effects of NaCl salinity stress in strawberry at Shahed University in 2015. NaCl treatments, 0, 25 and 50 mM, were applied in hydroponic medium on from the root zone of ‘Camarosa’ cultivar. Putrescine treatments were also applied at 0, 1.5 and 3 mM as foliage spray during growth period in 4 times with 15 days intervals. The results showed that, NaCl treatment especially at 50 mM, reduced shoot length, shoot fresh and dry weight, root fresh and dry weight, leaf number, leaf chlorophyll content, fruit number, fruit fresh and dry weight, yield and titratable acidity, and increased anthocyanin and total soluble solid content. Salinity stress had no effects on the root length. Application of 1.5 and 3 mM putrescines reduced harmful effects of salinity stress. Putrescines increased almost all characteristics under salinity condition and reduced total soluble solid content. Therefore, according to the results, putrescine, in both levels of 1.5 and 3 mM, could be a well strategy to reduce the limitation of salinity stress in strawberry production.
Meysam Mohammadi; Mehdi Saidi; Orang Khademi; Masoud Bazgir
Abstract
In order to study the effects of GA3and CaCl2 treatments in resolve the problems of sweet pepper culture in Ilam region (including small size fruits with sunscald and blossom end rot disorders), this study was carried out in Ilam University in 2012. For that, GA3 (50 mg/l) and CaCl2 (0.5%) treatments ...
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In order to study the effects of GA3and CaCl2 treatments in resolve the problems of sweet pepper culture in Ilam region (including small size fruits with sunscald and blossom end rot disorders), this study was carried out in Ilam University in 2012. For that, GA3 (50 mg/l) and CaCl2 (0.5%) treatments were sprayed at two (fruit set and 15 days thereafter) and three (fruit set, 10 and 20 days thereafter) times on the ‘California Wonder’ peeper and after ripening fruit characteristics were investigated. The results showed that, in most of the studied traits, there were no significant differences between two and three spraying times. However, GA3 in comparison to control, significantly increased yield, fruit number, marketability, fruit diameter, fruit weight, flesh firmness, fruit dry matter, ascorbic acid content, antioxidant capacity, chlorophyll content, plant height, internodes length, leaf area and lateral branch number and decreased sunscald and blossom end rot rates. CaCl2 treatment as compared to control increased fruit dry matter, flesh firmness, fruit thickness, chlorophyll b and total chlorophyll content, and reduced sunscald and blossom end rot. However, CaCl2 treatment had no significant effects on vegetative properties, including stem height, shoot diameter, internodes length, leaf area, lateral branch number, as well as fruit size and yield. According to these results, application of both GA3 and CaCl2 treatments can be effective in improving the qualitative and quantitative properties of sweet pepper.
Omidali Ghasem beigi; Javad Erfani Mogadam; Orang Khademi
Abstract
In the current study, for improving quality and quantity of ‘Yaghooti’ seedless grape, gibberellic acid was sprayed in four concentrations including zero (as control), 15, 25 and 40 mg/l, at three stages, and girdling treatments were carried out simultaneously with the third step of GA3 spraying ...
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In the current study, for improving quality and quantity of ‘Yaghooti’ seedless grape, gibberellic acid was sprayed in four concentrations including zero (as control), 15, 25 and 40 mg/l, at three stages, and girdling treatments were carried out simultaneously with the third step of GA3 spraying at the base of fruit bearing shoots with four replications. The cluster length was significantly increased by all three concentrations of GA3 in compare with the control. In fact, 14 days after GA3 spray, the cluster length respectively grew to 17.87, 19.73 and 23.95 cm at 15, 25 and 40 mg/L GA3, whereas, in the control sample it was 13.46 cm. Furthermore, the berry and cluster weight were increased by foliar application of GA3 and girdling in which the maximum berry weight (1.42 gr) and cluster weight (483.7 gr) were achieved by interaction of 40 mg/l GA3 and girdling. In addition, girdling treatment significantly led to the increase of the berry length and width as compared to control sample; however, for some traits there was not any meaningful treatment. Application of GA3 and girdling treatment significantly led to the increase of the TSS/TA ratio in compared to control.