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  - 
TY  - GEN
A1  - Raila, Jens
A1  - Rohn, Sascha
A1  - Schweigert, Florian J.
A1  - Abraham, Getu
T1  - Increased antioxidant capacity in the plasma of dogs after a single oral dosage of tocotrienols
T2  - Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe
N2  - The intestinal absorption of tocotrienols (TCT) in dogs is, to our knowledge, so far unknown. Adult Beagle dogs (n 8) were administered a single oral dosage of a TCT-rich fraction (TRF; 40 mg/kg body weight) containing 32 % a-TCT, 2 % b-TCT, 27 % g-TCT, 14 % d-TCT and 25 % a-tocopherol (a-TCP). Blood was sampled at baseline (fasted), 1, 2, 3, 4, 5, 6, 8 and 12 h after supplementation. Plasma and chylomicron concentrations of TCT and a-TCP were measured at each time point. Plasma TAG were measured enzymatically, and plasma antioxidant capacity was assessed by the Trolox equivalent antioxidant capacity assay. In fasted dogs, levels of TCT were 0·07 ( SD 0·03) mmol/l. Following the administration of the TRF, total plasma TCT peaked at 2 h (7·16 ( SD 3·88) mmol/l; P, 0·01) and remained above baseline levels (0·67 ( SD 0·44) mmol/l; P, 0·01) at 12 h. The TCT response in chylomicrons paralleled the increase in TCT in plasma with a maximum peak (3·49 ( SD 2·06) mmol/l; P, 0·01) at 2 h post-dosage. a-TCP was the major vitamin E detected in plasma and unaffected by TRF supplementation. The Trolox equivalent values increased from 2 h (776 ( SD 51·2) mmol/l) to a maximum at 12 h (1130 ( SD 7·72) mmol/l; P,0·01). The results show that TCT are detected in postprandial plasma of dogs. The increase in antioxidant capacity suggests a potential beneficial role of TCT supplementation in the prevention or treatment of several diseases in dogs.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 571 
KW  - dogs
KW  - tocotrienols
KW  - intestinal absorption
KW  - antioxidant capacity
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-413085
SN  - 1866-8372
IS  - 571
ER  -