EVALUATION OF THE POTENTIAL OF DIFFERENT BACTERIAL STRAINS ISOLATED FROM THE RHIZOSPHERE OF PLANTS FOR FURTHER USE IN PLANT GROWTH PROMOTION PUBLISHEDRenata Maria ŞUMĂLAN 1*, R.L. SUMALAN1, Jean C. YVIN2, Ersilia ALEXA1, Isidora RADULOV 1, Carmen BEINSAN1
Abstract. In concordance with the application of environmental-friendly technologies to exploit the natural potential of plants it is necessary to have a deeply knowledge about relations between plant, their natural habitat and microorganisms from rhizosphere. In the last years researchers highlighted the importance of rhizosphere microorganisms in increase of plant fitness by different mechanism: providing a better nutrition of plant, producing plant growth regulators such phytohormone, ensuring protection of the roots of plant from pathogen attack. Our study followed to isolate bacterial strains from rhizosphere of canola (Bassica rape) and nettle (Urtica dioica) and testing their capacities in promoting the growth of wheat plants As a 6 total strains, 4 were isolated from canola and 2 from the nettle that have proven high frequency of appearances on media plates. The pure isolated strains, were tested for support of germination of wheat kernels, plant growth promoting and proven of traits to production of the indoleacetic acid (IAA). For screening of isolates for the production of IAA were used Salkowski regent. The results have revealed significant differences compared to the control in terms of wheat seed germination for strains R-IV, R-III, R-I, U-I. The bacterial strains U II and RI were highlighted in sustaining plant growth through the accumulation of dry matter and production of IAA.
Keywords: Plant growth promoting rhizobacteria, IAA, rhizosphere