Research Paper

Development of Agrobacterium-mediated transformation technology for mature seed-derived callus tissues of indica rice cultivar IR64

Volume 3, Issue 2   April/May/June 2012
Pages 123 - 128
http://dx.doi.org/10.4161/gmcr.20032
Keywords: Agrobacterium, IR46, indica rice, mature seed-derived calli, regeneration, rice transformation, transgenic rice
Authors: Ranjan Kumar Sahoo and Narendra Tuteja

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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.

Received: December 9, 2011; Accepted: March 14, 2012

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