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Agrobacterium Ti plasmid indoleacetic acid gene is required for crown gall oncogenesis [Agrobacterium tumefaciens]
A gene (iaaP) necessary for virulence and indoleacetic acid (IAA) production has been located on a nopaline Ti plasmid of Agrobacterium tumefaciens C58. iaaP function was established by using transformation to insert nopaline or octopine Ti plasmids into an avirulent, Ti plasmid-free mutant 1D1293-3...
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Published in: | Proceedings of the National Academy of Sciences - PNAS 1982-05, Vol.79 (9), p.2812-2816 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that cite this one |
Online Access: | Get full text |
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Summary: | A gene (iaaP) necessary for virulence and indoleacetic acid (IAA) production has been located on a nopaline Ti plasmid of Agrobacterium tumefaciens C58. iaaP function was established by using transformation to insert nopaline or octopine Ti plasmids into an avirulent, Ti plasmid-free mutant 1D1293-3 that was defective in IAA synthesis (iaaC-). The resulting transformants produced increased levels of IAA and virulence was restored. When these transformants were cured of their Ti plasmid, virulence and high IAA production levels were concomitantly lost. A Tn5 mutagenized TiC58 plasmid, deficient in the ability to direct increased synthesis of IAA, was inserted by transformation into mutant 1D1293-3. The resulting transformants 1D1293-3 (TiC58::Tn5) remained avirulent and iaaP-. Restriction analysis of the TiC58::Tn5 plasmid DNA identified the iaaP gene at 20.9 kilobases to the left of the T-DNA. A major aromatic-amino-acid aminotransferase is coded by the iaaC gene, but not by the iaaP gene. The possible reasons for the iaaP locus to be situated outside the T-DNA region are discussed. |
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ISSN: | 0027-8424 1091-6490 |
DOI: | 10.1073/pnas.79.9.2812 |