Abstract
Plasmid DNA (pChlCOD), containing the selectable hygromycin phosphotransferase hpt gene for hygromycin B resistance and the Arthrobacter globiformis codA gene for choline oxidase which catalyzes the direct conversion of choline to glycinebetaine, was delivered into rice plants using Agrobacterium-mediated gene transfer via scutellum-derived calli. Southern, Northern and Western blot analyses demonstrated that the foreign gene had been transferred, integrated into rice chromosomal DNA and expressed. Drought test indicated that glycinebetaine acts as an osmoprotectant and its production in transgenic rice plant helped the cells to maintain osmotic potential and increased root growth, and thus enhanced the ability of the plants to tolerate water deficit
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