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The role of potassium as an ionic signal in the regulation of cyanobacterium Nostoc muscorum response to salinity and osmotic stress
Author(s) -
Bhargava Santosh
Publication year - 2005
Publication title -
journal of basic microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.58
H-Index - 54
eISSN - 1521-4028
pISSN - 0233-111X
DOI - 10.1002/jobm.200410468
Subject(s) - salinity , osmotic shock , potassium , cyanobacteria , botany , ionic bonding , sodium , chemistry , biology , biochemistry , ecology , bacteria , ion , genetics , organic chemistry , gene
Abstract Spontaneously occurring thallium‐resistant (Tl + ‐R) mutant of diazotrophic, heterocystous cyanobacterium Nostoc muscorum is described in which Tl + ‐R phenotype is the cause of defective salinity‐inducible K + uptake activity and proline uptake activity. The results indicate that mutant strain is more sensitive to salinity and osmotic stresses than its parent. The mutational inactivation of salinity‐inducible proline uptake was found associated with increased sensitivity of the cyanobacterial photosynthetic O 2 evolution and nitrogenase activity under salinity and osmotic stresses. It is suggested that in the cyanobacterium Nostoc muscorum K + functions as a primary osmolyte which is associated with salinity‐inducible proline uptake leading to the acquisition of salt tolerance in the cyanobacterium. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)