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Rapid transformation ofMedicago truncatula: regeneration via shoot organogenesis

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Summary

A rapid transformation and regeneration system has been developed forM. truncatula cv Jemalong (barrel medic) by which it is possible to obtain transgenic plants within 2.5 months. The procedure involvesAgrobacterium-mediated transformation of cotyledon explants coupled with the regeneration of transformed plants via direct organogenesis. To develop the procedure,M. truncatula explants were transformed with the binary plasmid pSLJ525 which carries thebar gene. Thebar gene encodes phosphinothricin acetyl transferase, and transformed plants were selected on media containing phosphinothricin (Ignite, AgrEvo). Transformed plants show phosphinothricin acetyl transferase activity and Southern blot analysis indicates that they carry thebar gene integrated into their genomes. The resistance to phosphinothricin is stable and is inherited by the R1 progeny as a single dominant Mendelian trait. The transgenic plants are highly resistant to the broad spectrum herbicide, Ignite and therefore may also have commercial applications.

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Authors and Affiliations

  1. The Samuel Roberts Noble Foundation, Plant Biology Division, 2510 Sam Noble Parkway, 73401, Ardmore, Oklahoma, USA

    Anthony T. Trieu & Maria J. Harrison

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  1. Anthony T. Trieu
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  2. Maria J. Harrison
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Communicated by J. M. Widholm

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Trieu, A.T., Harrison, M.J. Rapid transformation ofMedicago truncatula: regeneration via shoot organogenesis. Plant Cell Reports 16, 6–11 (1996). https://doi.org/10.1007/BF01275439

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  • DOI: https://doi.org/10.1007/BF01275439

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