alexa Development of Agrobacterium-mediated transformation technology for mature seed-derived callus tissues of indica rice cultivar IR64.
Agri and Aquaculture

Agri and Aquaculture

Rice Research: Open Access

Author(s): Sahoo RK, Tuteja N, Sahoo RK, Tuteja N, Sahoo RK, Tuteja N

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Abstract Indica rice cultivar IR64 is most recalcitrant to regenerate, which affects the transformation efficiency especially when mature seed-derived callus tissues are used as explants. Therefore, a simple, rapid and improved genetic transformation protocol has been developed for the indica rice cultivar IR64 using Agrobacterium-mediated genetic transformation. With different hormonal combination tested, the maximum callus induction was observed on MS medium supplemented with 2.5 mg/l 2,4-D and 0.15 mg/l BAP from the scutellum explants. Three weeks old scutellum derived callus explants were immersed in Agrobacterium suspension (strain LBA4404, OD600=1.0) and co-cultured at 26±2°C in dark for 2 d. The maximum transformation efficiency (12\%) was achieved with infection of callus explants for 20 min along with use of 150 μm acetosyringone. The maximum plant regeneration was observed on MS medium supplemented with 3 mg/l BAP, 1 mg/l Kinetin and 0.5 mg/l NAA. The maximum root induction was observed on MS medium along with 10 g/l glucose and 20 g/l sucrose. The integration of the transgene in T1 transgenic plants was confirmed by polymerase chain reaction and Southern blot analyses. The copy number of transgenes has been found to vary from 1 to 2 in transgenic plants. By using this improved method we have successfully raised transgenic rice plants within 3 mo from seed inoculation to plant regeneration. This article was published in GM Crops Food and referenced in Rice Research: Open Access

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