Rhizobium-legume symbiosis in the absence of Nod factors: two possible scenarios with or without the T3SS.

ABSTRACT: The occurrence of alternative Nod factor (NF)-independent symbiosis between legumes and rhizobia was first demonstrated in some Aeschynomene species that are nodulated by photosynthetic bradyrhizobia lacking the canonical nodABC genes. In this study, we revealed that a large diversity of non-photosynthetic bradyrhizobia, including B. elkanii, was also able to induce nodules on the NF-independent Aeschynomene species, A. indica. Using cytological analysis of the nodules and the nitrogenase enzyme activity as markers, a gradient in the symbiotic interaction between bradyrhizobial strains and A. indica could be distinguished. This ranged from strains that induced nodules that were only infected intercellularly to rhizobial strains that formed nodules in which the host cells were invaded intra

SUBMITTER: Okazaki S 

PROVIDER: S-EPMC4681849 | biostudies-literature | 2016 Jan

REPOSITORIES: biostudies-literature