Abstract
Transgenic plants of an Indian isolate of Lemna minor have been developed for the first time using Agrobacterium tumefaciens and hard nodular cell masses ‘nodular calli’ developed on the BAP - pretreated daughter frond explants in B5 medium containing sucrose (1.0 %) with 2,4-D (5.0 μM) and 2-iP (50.0 μM) or 2,4-D (50.0 μM) and TDZ (5.0 μM) under light conditions. These calli were co-cultured with A. tumefaciens strain EHA105 harboring a binary vector that contained genes for β-glucuronidase with intron and neomycin phosphortransferase. Transformed cells selected on kanamycin selection medium were regenerated into fronds whose transgenic nature was confirmed by histochemical assay for GUS activity, PCR analysis and Southern hybridization. The frequency of transformation obtained was 3.8 % and a period of 11–13 weeks was required from initiation of cultures from explants to fully grown transgenic fronds. The pretreatment of daughter fronds with BAP, use of non-ionic surfactant, presence of acetosyringone in co-cultivation medium, co-culture duration of 3 d and 16 h photoperiod during culture were found crucial for callus induction, frond regeneration and transformation of L. minor. This transformation system can be used for the production of pharmaceutically important protein and in bioremediation.
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Abbreviations
- 2,4-D:
-
2,4-dichlorophenoxyacetic acid
- 2-iP:
-
6-(-γ,-γ-dimethyl allyl amino) purine
- BAP:
-
6-benzylaminopurine
- IAA:
-
Indole-3-acetic acid
- Kin:
-
Kinetin
- TDZ:
-
Thidiazuron
- CaMV:
-
Cauliflower mosaic virus
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Acknowledgements
GKC thanks to Council of Scientific and Industrial Research (CSIR), New Delhi, India for providing financial support. We are also thankful to Dr. Richard Jefferson, Center for Application of Molecular Biology to International Agriculture (CAMBIA), Australia, for providing the plasmid pCAMBIA2301.
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Chhabra, G., Chaudhary, D., Sainger, M. et al. Genetic transformation of Indian isolate of Lemna minor mediated by Agrobacterium tumefaciens and recovery of transgenic plants. Physiol Mol Biol Plants 17, 129–136 (2011). https://doi.org/10.1007/s12298-011-0059-5
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DOI: https://doi.org/10.1007/s12298-011-0059-5