Abstract
Our study aimed at assessing the effects of 3 Plants Growth Promoting Rhizobacteria (PGPR) either singly or in combination on maize growth under laboratory and greenhouse conditions. Seeds were inoculated with single and combined solution of 108 CFU/ml of Rhizobacteria. Seeds were not inoculated for the control variant. The highest germination percentage was obtained with the combination of Pseudomonas fluorescens and Pseudomonas putida. This combination also recorded the best vigor index, plants circumferences number of leaves and the leaf area. The maximal heights of plants were observed with seeds treated with Azospirillum lipoferum with an increase of 37.32%. The highest rates of underground dry matter were recorded with A. lipoferum, with an increase of more than 56% comparative to control, while the combination P. fluorescens and P. putida increased the aerial dry matter of 59.11%. Finally, the highest value of the aerial biomass was obtained with the plants treated with the combination of P. fluorescens and P. putida and the highest underground biomass was obtained with plants treated only with A. lipoferum. These results suggest that specific combinations of PGPR can be considered as efficient alternative biofertilizers to promote maize seed germination, biomass and crop yield.
Highlights
Plant Growth Promoting Rhizobacteria (PGPR) is a group of bacteria that actively colonize plant roots and increase plant growth and yield [1]
Our data revealed that Plants Growth Promoting Rhizobacteria (PGPR) treatment promotes maize (Zea mays L.) seed germination (Table 1)
The highest germination percentage (100%) was observed with the seeds inoculated with the combination of P. fluorescens-P. putida follow by those inoculated with A. lipoferum (98.33%)
Summary
Plant Growth Promoting Rhizobacteria (PGPR) is a group of bacteria that actively colonize plant roots and increase plant growth and yield [1]. The plants inoculation with rhizobacteria PGPR is a major asset for biological agriculture. This environmental biotechnology is receiving attention as a way to reduce chemical fertilizer doses without affecting crop yield. It can be evaluated as a component of integrated management strategies in agriculture [9,10,11].
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