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Published on: January 26, 2018
Rubber Tree (Hevea brasiliensis Muell. Arg)
Perumal Venkatachalam1, Radha Jayashree, Karumamkandathil Rekha
1Biotechnology Division, Rubber Research Institute of India, Kottayam-686 009, Kerala, India.
This study presents a new Agrobacterium-mediated genetic transformation protocol for rubber trees (Hevea brasiliensis) to combat tapping panel dryness (TPD). The developed method successfully generated genetically engineered plants with improved traits for natural rubber production.
Area of Science:
- Plant Biotechnology
- Agricultural Science
- Molecular Biology
Background:
- Rubber tree (Hevea brasiliensis) is a vital industrial crop, but tapping panel dryness (TPD) causes significant yield losses.
- Conventional breeding for desired traits in rubber trees is time-consuming and labor-intensive.
- Genetic engineering offers a promising alternative for improving Hevea genotypes.
Purpose of the Study:
- To develop an efficient Agrobacterium-mediated transformation protocol for rubber trees.
- To generate genetically engineered Hevea brasiliensis plants with enhanced traits.
- To introduce the Hevea brasiliensis superoxide dismutase (HbSOD) gene into rubber trees.
Main Methods:
- Immature anther-derived calli of Hevea brasiliensis clone RRII 105 were used as explants.
- Agrobacterium tumefaciens-mediated co-cultivation with a plasmid containing HbSOD, uidA (GUS reporter), and nptII (selectable marker) genes.
- Optimized co-cultivation conditions included acetosyringone, betaine HCl, and proline, followed by selection on kanamycin.
Main Results:
- A robust transformation protocol was established, yielding significant numbers of kanamycin-resistant calli.
- Transformed calli exhibited strong GUS activity, indicating successful reporter gene expression.
- Regenerated plantlets showed GUS positivity and confirmed transgene integration (uidA, nptII, HbSOD) via PCR and Southern blot analysis.
Conclusions:
- The developed Agrobacterium-mediated transformation protocol is effective for generating genetically engineered rubber trees.
- This method provides a foundation for introducing beneficial genes to improve rubber tree cultivation and address challenges like TPD.
- Genetic engineering holds significant potential for accelerating the development of improved Hevea brasiliensis varieties.
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