Abstract
It is known that salt stress response of plants is changed by the treatment of various bioactive substances including essential elements. Polyamine levels are changed by various stresses, suggesting the possible relation of polyamine with stress responses of plants. The purpose of this investigation is to make clear that relationship between salt stress response and polyamine metabolism under different nitrogen mediums.
The degree of growth inhibition caused by NaCl was small under the treatment with a low nitrogen medium that contains a half nitrogen of the usual culture medium for rice. Contents of polyamine, especially putrescine, increased in response to the nitrogen concentrations of the medium. Under the salt stress condition, changes of polyamine content, except spermine, differed with nitrogen mediums. These results suggested that nitrogen mediums affected salt stress response of rice and polyamine metabolism might be concerned with the detoxification of ammonium accumulated under salt stress.
