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Site-specific mutagenesis in the TR-DNA region of octopine-type Ti plasmids

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Abstract

Site-specific insertion and deletion mutations affecting all six of the eukaryotic-like genes in the TR-DNA region of the octopine-type Ti plasmids pTil5955 or pTiA6 have been generated. None of the mutations affected virulence or tumor morphology on sunflower. Mutations in the coding regions of two of the genes resulted in tumors without any detectable mannopine, mannopinic acid or agropine, and mutations in either the coding region or in the 3′ untranslated region of a third gene eliminated biosynthesis of agropine, but not mannopine or mannopinic acid. Detection of two previously unobserved silver nitrate-positive substance in tumors incited by one of the mutant strains, together with data on the presence of opines in tumors incited by coinoculation with mixtures of different mutant strains, allowed us to propose the functional order of all three genes involved in the biosynthesis of mannopine, mannopinic acid and agropine. TR-DNA was absent in tumors incited by anAgrobacterium tumefaciens strain harboring a Ti plasmid in which the right border of the TR-DNA region was deleted.

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Komro, C.T., DiRita, V.J., Gelvin, S.B. et al. Site-specific mutagenesis in the TR-DNA region of octopine-type Ti plasmids. Plant Mol Biol 4, 253–263 (1985). https://doi.org/10.1007/BF02418244

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