Open AccessCompetition among symbiotic cyanobacterial Nostoc strains forming artificial associations with rice ( Oryza sativa )
Author(s) -
Nilsson Malin,
Rasmussen Ulla,
Bergman Birgitta
Publication year - 2005
Publication title -
fems microbiology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.899
H-Index - 151
eISSN - 1574-6968
pISSN - 0378-1097
DOI - 10.1016/j.femsle.2005.03.010
Subject(s) - nostoc , biology , cyanobacteria , oryza sativa , strain (injury) , botany , competition (biology) , temperature gradient gel electrophoresis , agar plate , symbiosis , chemotaxis , microbiology and biotechnology , bacteria , 16s ribosomal rna , ecology , biochemistry , genetics , gene , receptor , anatomy
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.