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pubmed-article:16593055pubmed:abstractTextBT37 is a crown gall teratoma incited on tobacco by Agrobacterium tumefaciens containing pTi-T37, a nopaline-type Ti plasmid. Treatment of this cloned tumor tissue with kinetin at 1 mg/liter results in the formation of relatively normal-appearing shoots. These shoots can be induced to root and set viable seed. In contrast to BT37 tissue, the derived tissues are not phytohormone independent and do not produce nopaline. The reverted plants, like normal tobacco plants, are susceptible to infection by A. tumefaciens. This loss of tumorous traits is accompanied by the loss of most of the Ti plasmid sequences (T-DNA) found in BT37 DNA. Southern blot analysis indicates that the revertant tissues have lost the central portion of the T-DNA, which contains the "common DNA" sequences, a highly conserved region of the Ti plasmid that has been found to be incorporated into all tumors studied. Thus, these sequences appear necessary for oncogenicity and tumor maintenance and their loss is probably directly related to tumor reversal. The reverted plants as well as the plants obtained from seed, however, do retain sequences homologous to the ends of the T-DNA present in the parental teratoma. The persistence of foreign DNA sequences during the process of meiosis and seed formation has important implications for the possibility of the genetic engineering of plants.lld:pubmed
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pubmed-article:16593055pubmed:authorpubmed-author:YanoNNlld:pubmed
pubmed-article:16593055pubmed:authorpubmed-author:SimpsonR BRBlld:pubmed
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pubmed-article:16593055pubmed:dateRevised2010-9-14lld:pubmed
pubmed-article:16593055pubmed:year1981lld:pubmed
pubmed-article:16593055pubmed:articleTitleRevertant seedlings from crown gall tumors retain a portion of the bacterial Ti plasmid DNA sequences.lld:pubmed
pubmed-article:16593055pubmed:affiliationDepartment of Microbiology and Immunology, University of Washington, Seattle, Washington 98195.lld:pubmed
pubmed-article:16593055pubmed:publicationTypeJournal Articlelld:pubmed
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