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

Front Plant Sci 2016 31;7:379. Epub 2016 Mar 31.

Department of Biology, University of Crete Heraklion, Greece.

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 H2O2 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.

Download full-text PDF

Source
http://dx.doi.org/10.3389/fpls.2016.00379DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4814703PMC
April 2016
22 Reads

Publication Analysis

Top Keywords

as-samdc plants
12
tolerance responses
8
trade-off growth
8
growth tolerance
8
stress responses
8
stress as-samdc
8
salt stress
8
as-samdc
6
altered developmental
4
developmental characteristics
4
increased height
4
contrary salt
4
plants reduced
4
number contrary
4
leaf number
4
height leaf
4
characteristics increased
4
increased biomass
4
increase understanding
4
understanding role
4

References

(Supplied by CrossRef)
The roles of reactive oxygen species in plant cells
Bailey-Serres et al.
Plant Physiol. 2006

Similar Publications