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J Ree Final Thesis 3 22 12.pdf Public Deposited

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  • Recalcitrance to transformation makes genetic engineering of many valuable plants infeasible for practical use. Transitory host modification during transformation using transgenes offers a possible means of overcoming this obstacle. In prior work in our laboratory, the genes GA20ox7 and EBB1 were found to increase regeneration in vitro. In this project, I reanalyzed the regenerative properties of these two genes using a model poplar (hybrid Populus tremula x P. alba INRA 717-1B4) and a genotype that is recalcitrant to transform, P. trichocarpa (Nisqually-1):N-1. Three replicate transformation experiments were performed to compare callus, shoot, and transgenic shoot formation with the two genes and an Empty-Vector control. No shoots were produced by N-1 explants with or without the genes. 717 explants transformed with p409S:GA20ox7 regenerated poorly, producing a low proportion of transgenic shoots for stem (12.4%) and leaf (8.19%) explants compared to that for empty vector controls (24.4%, 29.5%). 717 explants transformed with p409S:EBB1, however, had a greater numbers of shoots per stem and leaf explant (37.7% and 54.2% increase, respectively) and a higher proportion (50.8%) of transgenic shoots from 717 leaf explants (44.5%) compared to the Empty-Vector controls (29.5% ). Additionally, callus growth on N-1 stem explants was increased by 116% by EBB1 and 76.8% by GA20ox7 compared to Empty-Vector controls. I conclude that the EBB1 transgene shows promise in improving transformation, but it must be removed or reactivated shortly after transformation due to apparent cytokinin toxicity and morphological defects.  
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  • description.provenance : Submitted by Wanda Crannell (crannelw@hort.oregonstate.edu) on 2012-06-11T20:12:12ZNo. of bitstreams: 2J Ree slides 3 15 12.pptx: 6047972 bytes, checksum: e8b103a0621bdbb9b0fe4434a1f3ed4e (MD5)J Ree Final Thesis 3 22 12.pdf: 840228 bytes, checksum: c40891f35d71ea198756c29475ca8bc2 (MD5)
  • description.provenance : Made available in DSpace on 2012-06-11T20:12:12Z (GMT). No. of bitstreams: 2J Ree slides 3 15 12.pptx: 6047972 bytes, checksum: e8b103a0621bdbb9b0fe4434a1f3ed4e (MD5)J Ree Final Thesis 3 22 12.pdf: 840228 bytes, checksum: c40891f35d71ea198756c29475ca8bc2 (MD5)

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