Abstract:
Saline sodic soil is a soil with high salt which easily dissolve water, high exchangeable sodium with high pH. It is harmful to the plants and results of less growth. In saline soils, only salt tolerant plants can grow normally. In saline sodic soil, beside the sodium toxicity, some nutrients and micronutrients are precipitated due to alkaline condition. Plants cannot absorb and show symptoms of nutrient deficiency. When the plants have been grown in saline soils, they have some mechanisms to respond survival. The objective of this study was to determine the expression of DREB2 (Dehydration responsive element binding proteins2) isolated from wild sugarcane and interspecific sugarcane hybrid (Biotech 2) and transformed into tobacco which receiving mimic saline sodic soil. The transgenic tobacco plants were planted in 1/10 Hoagland solution at pH 8.5 together with NaCl at concentrations of 0, 100 and 200 mM. It was found that when the concentrations of NaCl were increased the plants wilted and leaves turned yellow. The determination of DREB2 gene expression by using real time PCR indicated that the expression of DREB2 gene from interspecific sugarcane hybrid showed higher expression than that of wild cane.