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Time required for tumor induction by Agrobacterium tumefaciens
Applied and Environmental Microbiology
|September 1, 1986
Summary
Agrobacterium tumefaciens mutants lacking cellulose still cause tumors. However, these bacteria require 4 to 8 hours of contact time at the wound site to induce tumor formation in plants.
Area of Science:
- Plant pathology
- Bacteriology
- Molecular genetics
Background:
- Agrobacterium tumefaciens is a plant pathogen that causes crown gall disease.
- Cellulose production by A. tumefaciens is essential for its attachment to plant tissues.
- Cellulose-minus mutants of A. tumefaciens are virulent but can be easily removed from wound sites.
Purpose of the Study:
- To determine the minimum duration of bacterial presence required for tumor induction by cellulose-minus A. tumefaciens mutants.
- To investigate the role of bacterial attachment time in plant pathogenesis.
Main Methods:
- Bryophyllum diagremontiana leaves were inoculated with cellulose-minus A. tumefaciens mutants.
- Bacterial presence was terminated by washing the leaves with water at various time points post-inoculation.
- Tumor formation was assessed to determine the minimum infection time.
Main Results:
- Cellulose-minus A. tumefaciens mutants retained virulence and induced tumors.
- The minimum time required for tumor induction by these mutants was determined to be between 4 and 8 hours.
- Washing with water effectively removed bacteria, highlighting the transient nature of attachment for successful infection.
Conclusions:
- A minimum of 4 to 8 hours of contact is necessary for cellulose-minus A. tumefaciens to initiate tumor formation.
- While cellulose is not essential for virulence, it may play a role in prolonged bacterial attachment and infection efficiency.
- These findings provide insights into the early stages of Agrobacterium-mediated plant transformation.