Effect of inoculation with putative plant growth-promoting rhizobacteria isolated from Pinus spp. on Pinus pinea growth, mycorrhization and rhizosphere microbial communities

Journal of Applied Microbiology
Jorge BarriusoF J Gutierrez Mañero

Abstract

In this study, 10 putative plant growth-promoting rhizobacteria (PGPR) were assayed for their ability to improve Pinus pinea growth and mycorrhization. After an inoculation assay, except for two, all strains stimulated plant growth. All bacteria altered rhizosphere microbial communities as revealed by phospholipid fatty acid analysis; associating plant growth promotion with a decrease in biological diversity. Three strains were tested for their ability to enhance pine mycorrhization with wild fungi species. Only strain BB1 increased the total number of mycorrhizal root tips. Mycorrhizas present in the roots of each treatment were identified by ribosomal RNA sequencing and denaturing gradient gel electrophoresis analysis, detecting specificity between mycorrhizal species colonizing the roots and the inoculated PGPR. In conclusion, BB1 appears to be a good candidate to be developed into a biofertilizer directed to enhance pine growth and mycorrhization, which should result in a better establishment rate for plants used in reforestation. This study shows the potential of PGPR to improve fitness of forest tree specie. Moreover, the specificity between the bacteria inoculated and the mycorrhiza that the plant selects involve a poten...Continue Reading

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Citations

Jun 12, 2009·Annual Review of Microbiology·Paola Bonfante, Iulia-Andra Anca
Dec 17, 2014·Journal of Applied Microbiology·X-F HuangJ M Vivanco
Sep 27, 2018·Journal of Integrative Plant Biology·Qiong WuJie Chen

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