Resistance to azetidine-2-carboxylic acid and sodium chloride tolerance in carrot cell cultures and Spirulina platensis.

Mutants of Spirulina platensis and of Daucus carota resistant to azetidine-2-carboxylic acid were tested for NaCl tolerance. A positive correlation was found between proline overproduction and osmotolerance. In carrot lines proline overproduction was not strictly proportional to NaCl tolerance insofar as cells characterized by differences in proline overproduction showed similar osmotolerance, suggesting that other factors could be involved.