Abstract
A protocol has been established for genetic transformation of the chloroplasts in two new cultivars of tomato (Solanum lycopersicum L.) grown in India and Australia: Pusa Ruby and Yellow Currant. Tomato cv. Green Pineapple was also used as a control that has previously been used for establishing chloroplast transformation by other researchers. Selected tomato cultivars were finalized from ten other tested cultivars (Green Pineapple excluded) due to their high regeneration potential and better response to chloroplast transformation. This protocol was set up using a chloroplast transformation vector (pRB94) for tomatoes that is made up of a synthetic gene operon. The vector has a chimeric aadA selectable marker gene that is controlled by the rRNA operon promoter (Prrn). This makes the plant or chloroplasts resistant to spectinomycin and streptomycin. After plasmid-coated particle bombardment, leaf explants were cultured in 50 mg/L selection media. Positive explant selection from among all the dead-appearing (yellow to brown) explants was found to be the major hurdle in the study. Even though this study was able to find plastid transformants in heteroplasmic conditions, it also found important parameters and changes that could speed up the process of chloroplast transformation in tomatoes, resulting in homoplasmic plastid-transformed plants.
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Data availability
The entire dataset is available as supplemental material to this publication.
Abbreviations
- Prrn:
-
rRNA Pomoter
- IAA:
-
Indole 3-acetic Acid
- BAP:
-
N6-benzylamino Purine
- LCY:
-
Lycopene Cyclase
- BHY:
-
β-Carotene Hydroxylase
- BKT:
-
β-Carotene Ketolase
- PRM:
-
Plant Regeneration Media
- CTAB:
-
Cetyltrimethylammonium Bromide
- GP:
-
Green Pineapple
- YC:
-
Yellow Currant
- PR:
-
Pusa Ruby
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Acknowledgements
We thank Prof. Dr. Ralph Bock (Max Planck Institute for molecular plant physiology) for providing pRB94 chloroplast specific vector and Deakin University Australia for partially supporting this research and providing postgraduate research scholarship to NT.
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Deakin University Australia is acknowledged for partially supporting this research and providing postgraduate research scholarship to the first author.
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Tanwar, N., Mahto, B.K., Rookes, J.E. et al. Chloroplast transformation in new cultivars of tomato through particle bombardment. 3 Biotech 14, 120 (2024). https://doi.org/10.1007/s13205-024-03954-3
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DOI: https://doi.org/10.1007/s13205-024-03954-3