Synergism between Phyllobacterium sp. (N2-fixer) and Bacillus licheniformis (P-solubilizer), both from a semiarid mangrove rhizosphere

Abstract

Mangrove seedlings were treated with a mixture of two bacterial species, the slow-growing, N 2 -fixing bacterium Phyllobacterium sp. and the fast-growing, phosphate-solubilizing bacterium Bacillus licheniformis, both isolated from the rhizosphere from black, white, and red mangroves of a semiarid zone. Nitrogen fixation and phosphate solubilization increased when the mixture was used compared to the effects observed when adding individual cultures, notwithstanding that there was no increase in bacterial multiplication under these conditions. Inoculation of black mangrove seedlings in artificial seawater showed the mixture performed somewhat better than inoculation of the individual bacterium; more leaves were developed and higher levels of 15 N were incorporated into the leaves, although the total nitrogen level decreased. This study demonstrates that interactions between individual components of the rhizosphere of mangroves should be considered when evaluating these bacteria as plant growth promoters. ß

Evaluation of efficiency parameters of phosphorous-solubilizing and N-fixing bacteria inoculations in wheat (Triticum aestivum L.)

“…Such outcomes from dual bacteria treatments were also reported by other researchers (Chiarini et al, 1998;Han and New, 1998). Mixed microbial cultures allow their components to interact with each other synergistically, and the interaction of N 2 -fixing bacteria with other bacteria could also inhibit their diazotrophic activity or plant growth (Rojas et al, 2001;Oliveira et al, 2002;Şahin et al, 2004).…”

Shifts Between and Among Populations of Wheat Rhizosphere Pseudomonas, Streptomyces and Phyllobacterium Suggest Consistent Phosphate Mobilization at Different Wheat Growth Stages Under Abiotic Stress

“…Phosphate-Solubilizing Potential First Time Reported for P. ifriqiyense and P. sophorae Multiple studies report Streptomyces (Molla et al, 1984;Jog et al, 2014) and Pseudomonas species to be strong P solubilizers (e.g., Richardson et al, 2009;Marasco et al, 2012;Sharma et al, 2013) and successful colonizers of the wheat rhizosphere (Mohammadi, 2012;Jog et al, 2014). Conversely, members of the genus Phyllobacterium, taxonomically classified to the order Rhizobiales, are hardly described for their P solubilization potential, but rather for their biocontrol activities (Lambert et al, 1990;Aisyah et al, 2017) or the capacity to fix nitrogen (Rojas et al, 2001). Our study now provides evidence for the potential of two Phyllobacterium species, namely P. ifriqiyense and P. sophorae, to in vitro solubilize P from its bound mineral form in the rhizosphere of winter wheat in the temperate climatic zone.…”

Early modifications of Brassica napus root system architecture induced by a plant growth‐promoting Phyllobacterium strain

“…The genus Phyllobacterium was originally described by Knösel (1962) to include bacteria that develop within leaf nodules of tropical ornamental plants. The further isolation of Phyllobacterium strains from different plant root systems underscored that this genus is commonly associated with plants and also colonizes niches other than leaf nodules (Lambert et al ., 1990; Hallmann et al ., 1997; Sturz et al ., 1998; Rojas et al ., 2001). Nevertheless, knowledge about the Phyllobacterium genus, and particularly its PGPB properties, remains limited.…”