UP-REGULATION OF SOME STRESS RELATED GENES ASSOCIATED WITH SALINITY TOLERANCE IN Oryza sativa PLANTS UNDER PHOSPHATE STARVATION CONDITION

Document Type : Original research paper

Authors

1 Egypt

2 Biological and Environmental Sciences Department, Faculty of Home Economics, Al-Azhar University, Egypt.

3 Genetics Department, Faculty of Agriculture, Tanta University, 31527 Tanta, Egypt

4 1-Genetics Department, Faculty of Agriculture, Tanta University, 31527 Tanta, Egypt 2-2 Biological and Environmental Sciences Department, Faculty of Home Economics, Al-Azhar University, Egypt.

Abstract

Salt stress severely effect on plants growth and development, Phosphate (P) availability as one of main plant nutrient was investigated with their role in salt tolerance in Oryza sativa L plants under two level of salinity. Giza178,an Egyptian cultivated rice, was used in this investigation. Plant responses was determined as changes in fresh and dry weight, membrane properties and lipid peroxidation product (MDA)contents, total chlorophyll and carotenoids and the content of phosphors, potassium and sodium. Changes in the expression pattern some stress related genes (bZIB, hsp4, hsp13, dhn3) 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 membrane leakage and MDA values. Significant up-regulation of all studied genes was recorded under phosphate starvation condition in stressed and non-stressed plants

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