الفهرس 
Rice’s importanceOnly 14 pages are availabe for public view
 |  | from | 109 |  |  |
| | | from | 109 | | |
Abstract
Salt stress severely affects plant growth and development. Phosphorus availability as one of main plant nutrient was investigated with its role in acquisition of salt tolerance in Oryza sativa L. plants under two levels of salinity. Giza178, Sakha101 and Giza182. Egyptian rice varieties were used in this investigation. Plant responses were determined as changes in shoot and root length, shoot and root fresh and dry weights, membrane properties, lipid peroxidation product (malondialdehyde) content, total chlorophyll and carotenoids, banding patterns of total soluble proteins and the content of phosphors, potassium and sodium. Also, changes in the expression patterns of some stress related genes (pKDP, bZIP1, dhn-3, dhn-4, hsp-4, hsp-9, hsp-13 and exp-1) were quantified by RT-qPCR. Both conditions of phosphate starvation and phosphate overuse induced significant changes in all studied parameters. The combination between phosphate starvation and salinity stress improved plant performance under both tested levels of salinity. This improvement was associated with significant reduction in rate of membrane leakage and MDA values. Significant up-regulation of all studied genes was recorded under phosphate starvation condition in stressed and non-stressed plants.