A Comparative Evaluation of the activities of a leguminous and non-leguminous rhizoflora and non rhizosphere microflora
Publication Date : 22/09/2015
Soil is the best environment for the growth of so many microbes. Of these some are seen colonized in the rhizosperic region of plants. This happens in response to the exudates of plant roots. The organisms are generally called rhizoflora. These rhizoflora are beneficial to the plants by secreting various Plant Growth Promoting substances. Hence they are called Plant Growth Promoting Rhizoflora (PGPR). PGPR also induce resistance in host plants by the production of antibiotics, by the production of compounds called siderophores etc. This compound also helps the host plants to absorb iron. Thus it helps plant to increase their growth and control plant pathogens. This study was conducted for comparing the activities of rhizoflora of a leguminous and a non-leguminous plant with a non-rhizosperic soil sample. From the microbes islated from the said sources, a total of 24 isolates (7 from leguminous rhizoflora, 10 from non-leguminous rhizoflora and 7 from non-rhizosperic soil) were taken for screening of the activities mentioned. Two colonies isolated from leguminous rhizosphere and one colony isolated from non-leguminous rhizosphere showed anti-microbial activity. Only a single culture, that too from leguminous rhizosphere showed siderophore production. And regarding phosphate solubilization, 6 isolates from leguminous rhizosphere, 3 from non-leguminous rhizosphere and 3 from non-rhizosphere showed positive activity.