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An efficient procedure for producing transgenic Hevea brasiliensis callus and plant lines from clone PB 260 was established with Agrobacterium tumefaciens using strain EHA105 harbouring the vector pCAMBIA2301. Transformation capacity and competence of the embryogenic calli were improved after two cycles of cryopreservation. When the cocultivation temperature was reduced from 27 to 20°C, the duration...