Abstract
Agrobacterium tumefaciens-mediated genetic transformation and the regeneration of transgenic plants was achieved in Hevea brasiliensis. Immature anther-derived calli were used to develop transgenic plants. These calli were co-cultured with A. tumefaciens harboring a plasmid vector containing the H. brasiliensis superoxide dismutase gene (HbSOD) under the control of the CaMV 35S promoter. The β-glucuronidase gene (uidA) was used for screening and the neomycin phosphotransferase gene (nptII) was used for selection of the transformed calli. Factors such as co-cultivation time, co-cultivation media and kanamycin concentration were assessed to establish optimal conditions for the selection of transformed callus lines. Transformed calli surviving on medium containing 300 mg l-1 kanamycin showed a strong GUS-positive reaction. Somatic embryos were then regenerated from these transgenic calli on MS2 medium containing 2.0 mg l-1 spermine and 0.1 mg l-1 abscisic acid. Mature embryos were germinated and developed into plantlets on MS4 medium supplemented with 0.2 mg l-1 gibberellic acid, 0.2 mg l-1 kinetin (KIN) and 0.1 mg l-1 indole-3-acetic acid. A transformation frequency of 4% was achieved. The morphology of the transgenic plants was similar to that of untransformed plants. Histochemical GUS assay revealed the expression of the uidA gene in embryos as well as leaves of transgenic plants. The presence of the uidA, nptII and HbSOD genes in the Hevea genome was confirmed by polymerase chain reaction amplification and genomic Southern blot hybridization analyses.
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Acknowledgements
We wish to thank Dr. N.M. Mathew, Director, for his constant encouragement during this research, and Dr. Leandro Pena for his valuable suggestions which enabled us to successfully complete this work.
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Communicated by L. Peña
An erratum to this article can be found at http://dx.doi.org/10.1007/s00299-003-0745-z
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Jayashree, R., Rekha, K., Venkatachalam, P. et al. Genetic transformation and regeneration of rubber tree (Hevea brasiliensis Muell. Arg) transgenic plants with a constitutive version of an anti-oxidative stress superoxide dismutase gene. Plant Cell Rep 22, 201–209 (2003). https://doi.org/10.1007/s00299-003-0666-x
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DOI: https://doi.org/10.1007/s00299-003-0666-x