Thesis (Ph.D.) - Cairo University - Faculty of Agriculture - Department of Botany

A Pot experiment was carried out during seasons (2015/2016-2016/2017), designed a two-factorial factors experiment in a layout of RCBD. The study aimed to evaluate the physiological and growth responses of wheat plant subjected to different levels of diluted Mediterranean seawater salts and investigate the best strategy, which could be used to enhance salinity negative impact using either seedling priming, foliar spraying of sodium nitroprusside in concentration of 150 æM or different potassium ferti-irrigation doses. In addition, their effect on potassium and sodium concentration distribution among wheat parts. Twenty treatments, irrigated by {u00BD} Hoagland strength and saline solution(ppm)(Control, 2000, 4000, 6000) and five treatments; Control,sprayed by tween 20, 150 æM Sodium nitroprusside used as seedling priming (SNP-P) and foliar spraying (SNP-S) as well as potassium applied in two doses 50% K and 200% K. Results clearly indicated that salinity stress showed having dual impact on plant growth and yield parameters depends on solutes concentration, in which an encouraging trend was observed until 2000-ppm and adversely effect was noticed in 4000 and 6000-ppm.Potassium treatmentplayed a role of enhacing plant water status, and it alleviate the negative impact of stress via adjust osmotica in whole plant cells through enhance solutes accumulation as well as its specific physiological roles in plant system

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