INVESTIGATION OF SEED GERMINATION IN THE TRANSGENIC CANOLA (BRASSICA NAPUS L.) UNDER SALT STRESS

Journal Title: International Research Journal of Applied and Basic Sciences - Year 2011, Vol 2, Issue 9

Abstract

Abiotic stresses such as drought and salinity are the most considerable cause of crop productivity decrease in agriculture. Genetic engineering can improve crop tolerance to abiotic stresses by many ways. Mannitol is one of plant osmoprotectants to cope with osmotic stress. In the previous study, we developed transgenic Canola (Brassica napus L.) using bacterial mtlD gene. Here, salt stress tolerance of transgenic (+mtlD) and non-transgenic (-mtlD canola plants studied on seed germination stages. The sterilized transgenic and non-transgenic seeds were cultured on MS media (pH 5.8) at different concentrations of NaCl (0 250 300, 350, 400 and 450 mM). HPLC analysis results showed that transgenic plants accumulate mannitol on average of 0.0440 mg/gDW, whereas wild-type plants did not accumulate any mannitol. However, transgenic seeds germinated at 350 mM NaCl, non-transgenic plants germinated not more than 250 mM of NaCl. Therefore, we demonstrated that the mtlD gene was expressed in transgeniccanola plants, resulting in mannitol accumulationand improved salt tolerance in transgenic seeds.

Authors and Affiliations

ROYA MOTALLEBI| Tissue Culture and Gene Transformation Department, Agricultural Biotechnology Research Institute of Iran (ABRII), Mahdasht Road, P. O. Box 31535-1897, Karaj, Iran, HASSAN RAHNAMA*| Tissue Culture and Gene Transformation Department, Agricultural Biotechnology Research Institute of Iran (ABRII), Mahdasht Road, P. O. Box 31535-1897, Karaj, Iran

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