Role of Bacteria in Plants

There are number of environmental factors that are responsible for retarding growth of plants. These include the flooding, salt, heavy metals, and manyphytopathogens. Many trials have been done to plants in order to make plants resistant to the deleterious effects of these environmental conditions. One of the researches was done on pepper plant and tomato plant to confer resistance to water stress. In this study, the bacteria having the ACC deaminase activity was isolated from soil samples. Inoculation of pepper plant with one of the strain (Achromobacter piechaudii ARV8) isolated- that is also reported to conferresistence to salt stress in both tomato and pepper plant- significantly increased the fresh and dry weights of both tomato and pepper seedlings exposed to temporary water stress. The bacterium also reduced the ethylene production in tomato saplings, following water pressure. In accumulation with A. piechaudiiARV8 strain, another strain Pseudomonas putida GR12-2 was also inoculated in both plants. After 7 weeks, the fresh and dry weights and growth for both plants were recorded and there was also seen a difference between two plants. The ratio of bacterial treated/bacterial non-treated was higher in tomato plants than with pepper plants