Stable transformation and direct regeneration in Coffea canephora P ex. Fr. by Agrobacterium rhizogenes mediated transformation without hairy-root phenotype |
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Authors: | Vinod Kumar K V Satyanarayana S Sarala Itty E P Indu P Giridhar A Chandrashekar G A Ravishankar |
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Institution: | (1) Plant Cell Biotechnology Department, Central Food Technological Research Institute, Mysore, 570 020, Karnataka, India |
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Abstract: | A system for genetic transformation of Coffea canephora by co-cultivation with Agrobacterium rhizogenes harbouring a binary vector has been developed. The objective of the present study was the genetic transformation and direct
regeneration of transformants through secondary embryos bypassing an intervening hairy root stage. Transformants were obtained
with a transformation efficiency up to 3% depending on the medium adjuvant used. A. rhizogenes strain A4 harbouring plasmid pCAMBIA 1301 with an intron uidA reporter and hygromycin phosphotransferase (hptII) marker gene was used for sonication-assisted transformation of Coffea canephora. The use of hygromycin in the secondary embryo induction medium allowed the selection of transgenic secondary embryos having
Ri T-DNA along with the T-DNA from the pCAMBIA 1301 binary vector. In addition transgenic secondary embryos devoid of Ri-T-DNA
but with stable integration of the T-DNA from the binary vector were obtained. The putative transformants were positive for
the expression of the uidA gene. PCR and Southern blot analysis confirmed the independent, transgenic nature of the analysed plants and indicated single
and multiple locus integrations. The study clearly demonstrates that A. rhizogenes can be used for delivering transgenes into tree species like Coffea using binary vectors with Agrobacterium tumefaciens T-DNA borders. |
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Keywords: | Coffea canephora Agrobacterium rhizogenes Genetic transformation Secondary somatic embryogenesis |
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