| Title | A Comparison of the Phenotypic and Genetic Stability of Recombinant Trichoderma spp. Generated by Protoplast- and Agrobacterium-Mediated Transformation |
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| Author | Rosa Elena Cardoza1,2, Juan Antonio Vizcaino1, Maria Rosa Hermosa1, Enrique Monte1, and Santiago Gutierrez*2 |
| Address | 1Spanish-Portuguese Center of Agricultural Research (CIALE), Department of Microbiology and Genetics, University of Salamanca, 37007 Salamanca, Spain, 2University of Le?, Campus of Ponferrada, Superior and Technical University College of Agricultural Engineers, Area of Microbiology, Avda. Astorga s/n. 24400 Ponferrada, Spain. |
| Bibliography | Journal of Microbiology, 44(4),p.383-395, 2006, |
| DOI | |
| Key Words | Trichoderma transformation, phenotypic stability, genetic stability |
| Abstract | Four different Trichoderma strains, T. harzianum CECT 2413, T. asperellum T53, T. atroviride T11 and T. longibrachiatum T52, which represent three of the four sections contained in this genus, were transformed by two different techniques: a protocol based on the isolation of protoplasts and a protocol based on Agrobacterium-mediated transformation. Both methods were set up using hygromycin B or phleomycin resistance as the selection markers. Using these techniques, we obtained phenotypically stable transformants of these four different strains. The highest transformation efficiencies were obtained with the T. longibrachiatum T52 strain: 65-70 transformants/μg DNA when transformed with the plasmid pAN7-1 (hygromycin B resistance) and 280 transformants/107 spores when the Agrobacterium-mediated transformation was performed with the plasmid pUR5750 (hygromycin B resistance). Overall, the genetic analysis of the transformants showed that some of the strains integrated and maintained the transforming DNA in their genome throughout the entire transformation and selection process. In other cases, the integrated DNA was lost. |
| Download PDF | 3-2005-164.pdf |