Title |
Silencing S-Adenosyl-L-Methionine Decarboxylase (SAMDC) in Nicotiana tabacum Points at a Polyamine-Dependent Trade-Off between Growth and Tolerance Responses
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Published in |
Frontiers in Plant Science, March 2016
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DOI | 10.3389/fpls.2016.00379 |
Pubmed ID | |
Authors |
Ifigeneia Mellidou, Panagiotis N. Moschou, Nikolaos E. Ioannidis, Chryssa Pankou, Katalin Gėmes, Chryssanthi Valassakis, Efthimios A. Andronis, Despoina Beris, Kosmas Haralampidis, Andreas Roussis, Aikaterini Karamanoli, Theodora Matsi, Kiriakos Kotzabasis, Helen-Isis Constantinidou, Kalliopi A. Roubelakis-Angelakis |
Abstract |
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. |
X Demographics
Geographical breakdown
Country | Count | As % |
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Unknown | 1 | 100% |
Demographic breakdown
Type | Count | As % |
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Members of the public | 1 | 100% |
Mendeley readers
Geographical breakdown
Country | Count | As % |
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Unknown | 40 | 100% |
Demographic breakdown
Readers by professional status | Count | As % |
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Student > Ph. D. Student | 10 | 25% |
Researcher | 6 | 15% |
Student > Bachelor | 4 | 10% |
Professor > Associate Professor | 3 | 8% |
Student > Doctoral Student | 2 | 5% |
Other | 6 | 15% |
Unknown | 9 | 23% |
Readers by discipline | Count | As % |
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Agricultural and Biological Sciences | 20 | 50% |
Biochemistry, Genetics and Molecular Biology | 5 | 13% |
Chemistry | 2 | 5% |
Energy | 1 | 3% |
Pharmacology, Toxicology and Pharmaceutical Science | 1 | 3% |
Other | 0 | 0% |
Unknown | 11 | 28% |