The wheat growth-promoting traits of Ochrobactrum and Pantoea species, responsible for solubilization of different P sources, are ensured by genes encoding enzymes of multiple P-releasing pathways.

摘要: Production and release of organic acids phosphatase enzymes by microbes are important for inorganic phosphorus cycling in soil. The presence microorganisms with corresponding traits the plant rhizosphere lead to improved P uptake ultimately growth promotion. We studied potential two rhizosphere-competent strains, Pantoea sp. MR1 Ochrobactrum SSR, solubilization different sources vitro. In a pot experiment we further revealed impact strains on wheat seedling performance soil amended either phytate, rock phosphate or K2HPO4 as solely source. To directly link P-solubilizing activity strain-specific genetic potential, designed novel primers glucose dehydrogenase (gcd), (pho) phytase (phy) genes, which related potential. Quantitative tracing these functional genes inoculated soils conducted allowed compare strain abundances dependency present observed strain- source-dependent patterns vitro well experiment, whereby release, particularly from was linked abundance. that microbial phosphatases is determined interplay between gene abundance, available P, substrate availability. Moreover, positive impacts seed inoculation root architecture aboveground parameters were observed. Our results suggest screening gcd, pho phy may help identify new taxa able solubilize mineralize bound P. Subsequently, targeted use improve availability agricultural consequently reduce fertilizer application.