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We investigated the effect of overexpressing  Fragaria vesca  L .  cv. Rügen S-adenosyl- l -methionine synthase ( FvSAMS ) and decarboxylase ( FvSAMDC ) genes on control and salt stressed  Nicotiana benthamiana  Domin plants. According to previous studies the overproduction of both proteins enhances the abiotic stress tolerance of plants, but the two enzymes have not yet been studied in one experimental system. We found that the transgenic plants subjected to long-term salt stress displayed higher levels of tolerance than the wild type (WT). In contrast to several earlier studies no antagonistic effect between ethylene and polyamine biosynthesis was observed in our experimental system. Overexpression of  FvSAMDC  had higher impact on the plant physiological parameters both in control and salt stress conditions, than that of  FvSAMS . Based on the data measured in the  FvSAMDC  lines there appears to be a positive correlation between the free polyamine levels and the proline content as well as the amount of ethylene, while there is a negative correlation between the free polyamine levels and the lignin content in the plants exposed to salt stress. The transformation vectors contained the CaMV35S promoter, the coding sequence of  FvSAMS  and  FvSAMDC  fused with synthetic green fluorescent protein ( sGFP ). We detected the subcellular localization of both enzymes and examined the possible stress induced changes in their distribution. In the case of  FvSAMS::sGFP  nuclear, nucleolar, cytoplasmic (near to the plasmalemma), plastid membrane, whereas in  FvSAMDC::sGFP  nuclear and homogenous cytoplasmic localization was detected. Therefore, SAM is assumed to be produced in situ for numerous biochemical reactions.

plant growth regulation

Comparative analysis of overexpressed Fragaria vesca S-adenosyl-l-methionine synthase (FvSAMS) and decarboxylase (FvSAMDC) during salt stress in transgenic Nicotiana benthamiana