TY  - JOUR
A1  - Jose Clemente-Moreno, Maria
A1  - Omranian, Nooshin
A1  - Saez, Patricia
A1  - Maria Figueroa, Carlos
A1  - Del-Saz, Nestor
A1  - Elso, Mhartyn
A1  - Poblete, Leticia
A1  - Orf, Isabel
A1  - Cuadros-Inostroza, Alvaro
A1  - Cavieres, Lohengrin
A1  - Bravo, Leon
A1  - Fernie, Alisdair R.
A1  - Ribas-Carbo, Miquel
A1  - Flexas, Jaume
A1  - Nikoloski, Zoran
A1  - Brotman, Yariv
A1  - Gago, Jorge
T1  - Cytochrome respiration pathway and sulphur metabolism sustain stress tolerance to low temperature in the Antarctic species Colobanthus quitensis
JF  - New phytologist : international journal of plant science
N2  - Understanding the strategies employed by plant species that live in extreme environments offers the possibility to discover stress tolerance mechanisms. We studied the physiological, antioxidant and metabolic responses to three temperature conditions (4, 15, and 23 degrees C) of Colobanthus quitensis (CQ), one of the only two native vascular species in Antarctica. We also employed Dianthus chinensis (DC), to assess the effects of the treatments in a non-Antarctic species from the same family. Using fused LASSO modelling, we associated physiological and biochemical antioxidant responses with primary metabolism. This approach allowed us to highlight the metabolic pathways driving the response specific to CQ. Low temperature imposed dramatic reductions in photosynthesis (up to 88%) but not in respiration (sustaining rates of 3.0-4.2 mu mol CO2 m(-2) s(-1)) in CQ, and no change in the physiological stress parameters was found. Its notable antioxidant capacity and mitochondrial cytochrome respiratory activity (20 and two times higher than DC, respectively), which ensure ATP production even at low temperature, was significantly associated with sulphur-containing metabolites and polyamines. Our findings potentially open new biotechnological opportunities regarding the role of antioxidant compounds and respiratory mechanisms associated with sulphur metabolism in stress tolerance strategies to low temperature.
KW  - Antarctica
KW  - antioxidant capacity
KW  - low temperature
KW  - photosynthesis
KW  - respiration
KW  - stress tolerance
KW  - sulphur metabolism
Y1  - 2019
U6  - https://doi.org/10.1111/nph.16167
SN  - 0028-646X
SN  - 1469-8137
VL  - 225
IS  - 2
SP  - 754
EP  - 768
PB  - Wiley
CY  - Hoboken
ER  -