argylesock says… Agrobacterium tumefaciens is the bacterium which provided the first technology for making genetically modified (aka genetically engineered) crops.
The Sorrel plant (left) was one of those found by the trainees during the recent training in Module 1 of how to be a plant doctor. The plant doctor training uses live plant material as well we photographs to lead the trainees through the process of field diagnosis.
The large and hard beige lump at the base of the stem is a gall caused by the bacterium Agrobacterium tumefaciens. The unique thing about this host/ pathogen interaction is the fact that DNA from the bacterium is inserted into the plant where it remains even long after the bacteria have been removed. This is the only natural example of DNA transfer of this kind; a natural genetic engineer.
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