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Polyamines (PAs) are nitrogenous molecules that are indispensable for cell viability and with an agreed-on role in the modulation of stress responses. Tobacco plants with downregulated SAMDC (AS- SAMDC ) exhibit reduced PAs synthesis but normal levels of PA catabolism. We used AS- SAMDC  to increase our understanding on the role of PAs in stress responses. Surprisingly, at control conditions AS- SAMDC  plants showed increased biomass and altered developmental characteristics, such as increased height and leaf number. On the contrary, during salt stress AS- SAMDC  plants showed reduced vigor when compared to the WT. During salt stress, the AS- SAMDC  plants although showing compensatory readjustments of the antioxidant machinery and of photosynthetic apparatus, they failed to sustain their vigor. AS- SAMDC  sensitivity was accompanied by inability to effectively control H 2 O 2  levels and concentrations of monovalent and divalent cations. In accordance with these findings, we suggest that PAs may regulate the trade-off between growth and tolerance responses.

frontiers in plant science

Silencing S-Adenosyl-L-Methionine Decarboxylase (SAMDC) in Nicotiana tabacum Points at a Polyamine-Dependent Trade-Off between Growth and Tolerance Responses