Abstract
The use of microbial technologies in agriculture is rapidly expanding with the discovery of new bacterial strains effective in improving plant growth. In this study, we tested and highlighted the efficacy of PGPR (Plant Growth Promoting Rhizobacteria) alone or in a consortium on maize growth. For this purpose, a greenhouse experiment was carried out in pots containing sterilized ferruginous soil for 30 days. The corn seeds of the EVDT 97 SRT C1 variety were inoculated with bacterial suspensions of concentration 108 UFC/ml. The experimental device was a random block of 16 three-repeat treatments. The incidence of PGPR inoculated strains is assessed on the biomass growth and yield parameters of maize. At the end of the trial, the results showed that inoculation stimulated plant growth and development and resulted in a significant increase in the height, diameter at the collar, leaf surface and dry weight of aerial biomass of 20.15%, 21%, 32.77% and 37.73% respectively compared to controls, especially in corn plants inoculated with B. thurengiensis + B. panthéthonicus + S. marcescens and Pseudomonas cichorii + Pseudomonas putida + Pseudomonas syringae. These results show the potential of using these rhizobacteria as biological inoculants to improve maize productivity in Benin.
Highlights
Some bacteria that live in the rhizosphere define how the volume of soil influenced by the roots has the ability to promote plant growth [1] [2]
At the end of the trial, the results showed that inoculation stimulated plant growth and development and resulted in a significant increase in the height, diameter at the collar, leaf surface and dry weight of aerial biomass of 20.15%, 21%, 32.77% and 37.73% respectively compared to controls, especially in corn plants inoculated with B. thurengiensis + B. panthéthonicus + S. marcescens and Pseudomonas cichorii + Pseudomonas putida + Pseudomonas syringae
Based on the analysis of the data presented at the level of Figure 2, it is noted that the plants that benefited from the treatments B. thuringiensis, B. thurenthonicus, B. panthothenicus, S. marcescenss, P. cichorii, P. putida, P. syringae and P. putida, B. thuringiensis S. marcesens all in group 4 showed the best growth in height with an increase of 20.15% compared to control plants in the group 1
Summary
Some bacteria that live in the rhizosphere define how the volume of soil influenced by the roots has the ability to promote plant growth [1] [2]. PGPRs influence plant health and productivity through a variety of mechanisms that involve mineral solubilization, nitrogen fixation, phytohormone synthesis, hydrolytic enzyme synthesis and balance modulation plant hormone by deamination of the ethylene precursor 1-aminocyclopropane-1-carboxylate (ACC) [4] [5]. These rhizobacteria can improve the elongation and branching of the root system which promotes the absorption of water and minerals from the soil to the host plant including wheat, barley, corn and rice that are necessary for plant survival [6]. Various species of PGPR have been considered PGPR to stimulate plant growth and some of them marketed in recent years belong to the genera Pseudomonas, Azospirillum, Azotobacter, Bacillus, Enterobacter, Rhizobium, Mycobacterium, Enterobacter, Caulobacter, Serratia, Flavobacterium, Actinobacteria sp. [10] [11]
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