Related Experiment Video
Updated: Aug 18, 2026

Production of Arbuscular Mycorrhizal (AM) Fungal Inoculum and Phenotypic Evaluation of Rice and AM Symbiosis Under Saline Conditions
Published on: March 14, 2025
Competition among symbiotic cyanobacterial Nostoc strains forming artificial associations with rice (Oryza sativa)
Malin Nilsson1, Ulla Rasmussen, Birgitta Bergman
1Department of Botany, Stockholm University, Lilla Frescati vägen 5, S-10691 Stockholm, Sweden. malin.nilsson@botan.su.se
Abstract:
Competition among four symbiotically competent Nostoc strains, colonizing rice roots, was examined using hetR-DGGE (denaturing gradient gel electrophoresis) as strain identification. Although mixed in various combinations, only one strain at a time associated with the rice roots. Nostoc strain 8964:3 was the most competitive and our data suggest that its competitive fitness was dependent on rapid hormogonial spreading as displayed on agar plates. Furthermore, rice roots induced hormogonia in all tested Nostoc strains, but only Nostoc strain 9104 showed positive chemotaxis towards the root. Inhibition of growth of competing cyanobacterial strains was not apparent.
More Related Videos
Related Concept Videos
Microbial Interactions: Competition
Bacterial Phylum Cyanobacteria
Microbial Interactions: Mutualism
Microbe-Plant Interactions
Microbial Interactions: Cooperation
Bioreactor Controls-III

