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Evidence for a role for L‐proline as a salinity protectant in the cyanobacterium Nostoc muscorum
Author(s) -
SINGH A. K.,
CHAKRAVARTHY D.,
SINGH T. P. K.,
SINGH H. N.
Publication year - 1996
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/j.1365-3040.1996.tb00342.x
Subject(s) - proline , salinity , cyanobacteria , biology , mutant , nostoc , biochemistry , botany , amino acid , bacteria , gene , genetics , ecology
Nostoc muscorum required an active proline oxidase in order to assimilate exogenous proline as a source of fixed nitrogen. A mutant strain ( Ac r ) resistant to growth inhibition by L‐azetidine‐2‐carboxylate (AC) was found to be deficient in proline oxidase activity, and to be a proline overaccumulator. Proline overaccumulation, resulting either from mutational acquisition of the Ac r phenotype or from salinity‐inducible uptake of exogenous proline, conferred enhanced salinity tolerance in this cyanobacterium.