Abstract
The objective of the present study was to develop a protocol for in vitro plantlet regeneration and Agrobacterium tumefaciens-mediated genetic transformation using immature cotyledon explants of Indian Kino tree (Pterocarpus marsupium Roxb.). Immature cotyledon explants excised from 9-day-old axenic seedlings produced optimal callus on Murashige and Skoog (MS) medium supplemented with 1.07 μM α-naphthalene acetic acid (NAA), after 2 weeks of culture. When the above said callus was incubated on MS + 8.90 μM 6-benzylaminopurine (BAP) + 1.07 μM NAA, a regeneration frequency of 60.41 % with shoot number and length 12.2 ± 0.85 and 1.4 ± 0.13, respectively, was observed. For further shoot multiplication and elongation, these cultures were transferred onto MS + 4.40 μM BAP. Elongated shoots dipped in 19.60 μM indole-3-butyric acid (IBA) for 24 h and then cultured on ½MS + 2.85 μM IBA, 75 % shoots developed roots and 95 % of plantlets survived in field condition. Organogenic callus was co-cultivated with the A. tumefaciens strain LBA4404 harboring the binary plasmid pCAMBIA1301with ß-glucuronidase (uidA) and hygromycin phosphotransferase (hpt) genes and grown on MS + 8.90 μM BAP + 1.07 μM NAA (RM) + 200 μM acetosyringone for 2 days and then transferred to MS + 8.90 μM BAP + 1.07 μM NAA + 20 mg/l hygromycin + 250 mg/l cefotaxime (SIM) and 4.40 μM BAP + 15 mg/l hygromycin + 200 mg/l cefotaxime (SEM). The putatively transformed shoots were subsequently rooted on ½MS + 2.85 μM IBA + 20 mg/l hygromycin (SRM), after pulse treatment for 24 h with 19.60 μM IBA. Successful gene transfer into putatively transformed plantlets was confirmed by histochemical GUS assay, PCR and RT-PCR analysis. Southern blot analysis of regenerated plantlets confirmed the integration of hpt gene in transgenic plantlets. In the present study, a rate of 20.92 % transformation frequency was achieved and the genetic transformation protocol presented here may pave way for genetic manipulation of this multipurpose legume tree.
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Acknowledgments
RT is thankful to Jawaharlal Nehru Memorial Fund, New Delhi, India for financial support. The authors gratefully acknowledge Prof. Peng Zhang, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, China for providing pCAMBIA1301`construct.
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Tippani, R., Yarra, R., Bulle, M. et al. In vitro plantlet regeneration and Agrobacterium tumefaciens-mediated genetic transformation of Indian Kino tree (Pterocarpus marsupium Roxb.). Acta Physiol Plant 35, 3437–3446 (2013). https://doi.org/10.1007/s11738-013-1378-7
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DOI: https://doi.org/10.1007/s11738-013-1378-7