Mohammad Safari; Masoud Arghavani; Azizolah Kheiri
Abstract
This experiment was conducted in order to investigate the morphological and physiological responses of vetiver grass (Chrysopogon zizanioides L. Roberty), to water deficit stress and salicylic acid application at Department of Horticultural Sciences, University of Zanjan in 2015. After 6 months of planting ...
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This experiment was conducted in order to investigate the morphological and physiological responses of vetiver grass (Chrysopogon zizanioides L. Roberty), to water deficit stress and salicylic acid application at Department of Horticultural Sciences, University of Zanjan in 2015. After 6 months of planting transplants into pots, three soil available water levels (40, 70 and 100%) and salicylic acid concentrations (0, 1 and 2 mili Molar) were applied in a factorial experiment based on completely randomized design with three replications for six weeks. Salicylic acid applied through foliar spray weekly. Generally, water deficit reduced root and shoot dry weight and leaf chlorophyll content. Root length, total phenol, proline and electrolyte leakage of leaves were increased by reducing the amount of available water. Salicylic acid application improved negative effects of water deficit in all attributes and its effect was more pronounced in 40% available water treatment. In all available water levels, there was no significant difference between 1 and 2 mili Molar salicylic acid treatments in root dry weight and leaves total phenol whereas in other factors. 2 mili Molar salicylic acid application had better result and plants in this treatment had higher shoot dry weight, proline and chlorophyll content and less electrolyte leakage than 1 mili Molar salicylic acid treatment, suggesting that in order to increase water deficit tolerance of vetiver grass, higher concentration of this plant growth regulator must be evaluated.
Reza Mohammadi; Masoud Arghavani; Seyed Najmadin Mortazavi; Mitra Aelaei
Abstract
This experiment was conducted to determine morphological and physiological responses of perennial ryegrass (Lolium perenne L.) at the germination and early seedling growth stage to drought stress and sodium nitroprusside (nitric oxide donor) application in horticultural science department at the University ...
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This experiment was conducted to determine morphological and physiological responses of perennial ryegrass (Lolium perenne L.) at the germination and early seedling growth stage to drought stress and sodium nitroprusside (nitric oxide donor) application in horticultural science department at the University of Zanjan in 2015. Turfgrass seeds were soaked for six hours in 0 (distilled water), 200, 400 and 600 µM of sodium nitroprusside solutions, and for drought stress treatments, germination and early seedling growth was done over the water potential range of 0 (distilled water), -1, -4 and -8 bar by polyethylene glycol. Generally, decline in water potential reduced seed germination percentage, root and shoot length, leaves chlorophyll and carotenoids content, whereas electrolyte leakage and proline content increased with decreasing of water potential. Sodium nitroprusside application at 400 and 600 µM ameliorate adverse effects of drought stress in all factors. However, in all water potentials, 600 µM treatment had no significant difference with control plants in electrolyte leakage, whereas 400 µM treatment reduced electrolyte leakage. Leaves proline content increased with decreasing water potential. Besides, treated plants with sodium nitroproside had more proline than untreated plants.In conclusion, among different investigated sodium nitroprpside concentrations, treated plants with 400 µM sodium nitroproside showed the best results.
Soheila Taheri; Masoud Arghavani; Seyed Najmadin Mortazavi
Abstract
This experiment was conducted in order to investigate morphophysiologycal responses of bermuda grass (Cynodon dactylon (L.) Pers.) to water deficit stress and sodium nitroprosside application in Horticultural Science Department at the University of Zanjan in 2015. Three soil available water levels (40, ...
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This experiment was conducted in order to investigate morphophysiologycal responses of bermuda grass (Cynodon dactylon (L.) Pers.) to water deficit stress and sodium nitroprosside application in Horticultural Science Department at the University of Zanjan in 2015. Three soil available water levels (40, 70 and 100%) and sodium nitroprosside (0, 250 and 500 micromolar) were applied in a factorial experiment based on completely randomized design with four replications. Water deficit reduced leaves relative water content and shoot growth whereas, root growth, root to shoot ratio, leaves antioxidant capacity, electrolyte leakage, proline, total phenol and chlorophyll content increased with decreasing soil available water. Sodium nitroprosside application moderated the adverse effects of water deficit in bermuda grass by increasing leaves antioxidant capacity, proline, and chlorophyll content as well as reducing electrolyte leakage and this effect was more pronounced in 500 micromolar, suggesting that higher concentrations of sodium nitroprosside must be evaluated.
masoud arghavani; Saeedeh Savadkoohi; Seyed Najmadin Mortazavi
Abstract
This experiment was conducted in order to investigate morphological and physiological responses of Kentucky bluegrass (Poa pratensis L.) to salinity and silicon application in horticultural science department at the University of Zanjan in 2015. The salinity levels (0, 40 and 80 mM NaCl) and sodium silicate ...
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This experiment was conducted in order to investigate morphological and physiological responses of Kentucky bluegrass (Poa pratensis L.) to salinity and silicon application in horticultural science department at the University of Zanjan in 2015. The salinity levels (0, 40 and 80 mM NaCl) and sodium silicate (0, 0.75 and 1.5 mM) were applied in complete nutrient solutions. Salinity reduced root and shoot growth, visual turf quality, leaves chlorophyll and potassium content, whereas electrolyte leakage, proline and sodium content increased with increasing salt concentration in nutrient solution. Silicon application ameliorate adverse effects of salinity in all factors except in potassium content and this effect was more pronounced in 80 mM NaCl. Although there was no significant difference between 0.75 and 1.5 mM sodium silicate in visual turf quality, root growth and chlorophyll content, altogether, application of 1.5 mM silicon had better results to increase salinity tolerance in Kentucky bluegrass, suggesting that higher concentrations of silicon must be evaluated.