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.