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Opine synthesis in wild-type plant tissue.
P Christou1, S G Platt, M C Ackerman
1Agracetus, 8520 University Green, Middleton, Wisconsin 53562.
Plant Physiology
|September 1, 1986
Summary
Opine production in plant tissues can occur through arginine metabolism, not solely Agrobacterium tumefaciens Ti plasmid transformation. This finding impacts the interpretation of plant transformation evidence.
Area of Science:
- Plant Pathology
- Microbiology
- Molecular Biology
Background:
- Crown gall is a neoplastic plant growth caused by Agrobacterium tumefaciens.
- Agrobacterium Ti plasmid's T-DNA integrates into plant chromosomes, enabling foreign gene transfer.
- Opine production is a common indicator of T-DNA plant transformation.
Purpose of the Study:
- To investigate the origin of opine production in plant tissues.
- To determine if opines can be synthesized via plant metabolic pathways.
- To re-evaluate the criteria for confirming T-DNA mediated plant transformation.
Main Methods:
- Microbiological assays to detect Agrobacterium presence and activity.
- Chromatographic and spectroscopic analyses for opine identification and quantification.
- Chemical analysis of plant tissue metabolism, particularly arginine pathways.
Main Results:
- Opines were detected in normal plant callus and tissues.
- Evidence indicates opines are a result of arginine metabolism in plants.
- Agrobacterium infection is not the sole source of opine production.
Conclusions:
- Plant tissues possess the capability to metabolize arginine into opines.
- Opine production alone may not be sufficient evidence for Agrobacterium Ti plasmid transformation.
- Researchers must consider plant metabolic pathways when assessing transformation events.