Chrysanthemum production stands out in ornamental plants market and several techniques can improve the production of this plant. Among them, is the use of beneficial microorganisms such as plant growth promoting rhizobacteria (PGPR); however, the use of PGPR has not been explored enough so far in chrysanthemum production, especially in field conditions. With regards to rhizobacteria, the group, Pseudomonas, can be explored as a good alternative to improve plant development. Hence, the objective of the present study was to evaluate the effect of PGPR on seedlings and, on the field experiments, plants development and the impact on rhizosphere soil. The strains of Pseudomonas putida IAC-RBcr5 and IAC-RBcr2 were able to improve chrysanthemum shoot biomass up to 40%. In addition, the plants treated with these strains had increased number of flowers, which is a desirable feature for the flower market. This is the first study to demonstrate the effect of P. putida strains on chrysanthemum seedlings and cut flowers grown in tropical field conditions.
Key words: Chrysanthemum morifolium L., rhizobacteria, inoculant, soil quality indicators.
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