Bacteria that originate from a source other than the organism or environment in which they are found and are not inherent to that organism or environment.
A naturally occurring pathogenic bacterium of plants that can incorporate a portion of a plasmid deoxyribonucleic acid (DNA) into plant cells.
One of the variant forms of a gene at a particular locus, or location, on a chromosome. Different alleles produce variation in inherited characteristics, such as blood type.
A compound (in food) that inhibits the normal uptake or utilization of nutrients or that is toxic in itself.
The process of cell death, which occurs naturally as a part of normal development, maintenance, and renewal of tissue in an organism.
Bacillus thuringiensis (Bt)
A strain of bacteria that produces a protein toxic to certain insects that cause significant crop damage. The bacteria are often used for biological pest control. The gene that codes for the toxic protein has been engineered into other soil bacteria and also directly into some crop plants.