Evaluation of Different Salinity Tolerance of Aeluropus and Rice Based on the Variation in Structure and Expression of their Catalase Enzyme

There is an imbalance between increase rate in demand for agricultural products and the growth rate of agricultural production. Much of this production deficit is attributed to abiotic stresses. These stresses reduce the yield of crops by more than ۵۰%. Obviously, it worth studying any idea which may lead to reducing the damages of them. In the present research, the transcription level of Catalase in root and shoot of Oryza sativa var. IR۶۴ and Aeluropus littoralis using qtr.PCR and the Aromatic and Instability indices based on amino acid composition were evaluated. The samples were taken at short-term, mid-term and long-term stress span. Analysis of the results showed significant differences in the both gene expression and studied biochemical aspects. The expression of catalase gene in Aeluropus roots was periodic and showed a twice increase and then a decrease however in roots of rice there was just a rise in its expression. In the all sampling of the rice shoots, CAT gene expression levels were either lower or without any significant different in contrast to the control samples. Meanwhile, the rates of expression in most of stressed Aeluropus shoots were significantly higher than control samples. Comparison of the biochemical indices showed that Aeluropus has a relative superiority over rice in terms of amino acid sequences. Based on the evaluated indices, the differences of response to salinity stress in the studied plants could be attributed to the differences in the promoter and nucleotide sequences of their genes.

Keywords:

Aromatic Index , Instability Index , Oxidative stress , Salt stress