Effects of Different Sources of Nitrogen on Endophytic Colonization of Rice Plants by Azospirillum sp. B510.

ABSTRACT: Azospirillum sp. B510, a free-living nitrogen-fixing bacterium isolated from the stems of rice (Oryza sativa cv. Nipponbare), was investigated to establish effective conditions for the colonization of rice plants. We analyzed the effects of the nitrogen sources KNO₃, NH₄Cl, urea (CO[NH₂]₂), and NH₄NO₃ at different concentrations (0.01-10 mM) on this colonization. Nitrogen promoted plant growth in a concentration-dependent manner, with minor differences being observed among the different nitrogen sources. Bacterial colonization was markedly suppressed on media containing NH₄⁺ concentrations higher than 1 mM. Since concentrations of up to and including 10 mM NH₄⁺ did not exhibit any

SUBMITTER: Naher K 

PROVIDER: S-EPMC6167112 | biostudies-literature | 2018 Sep

REPOSITORIES: biostudies-literature