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1

Reactive species, antioxidants and cold tolerance during deacclimation of Picea abies populations

100%
Pukacki P. M., Kaminska-Rozek E.
Acta Physiologiae Plantarum
|
2013
|
tom 35
|
nr 01
Seasonal changes in levels of reactive oxygen species (ROS), low-molecular weight antioxidants and activities of antioxidant enzymes were analyzed in relation to the freezing tolerance of 1-year-old needles from four populations of Norway spruce. Throughout the study period (from January until May), no significant changes were observed in the superoxide anion radical (O2-) or hydrogen peroxide (H2O2) levels in the needles. By contrast, a marked reduction was observed in concentrations of lowmolecular weight antioxidants, including flavonoids (FL), ascorbic acid (AsA) and slight glutathione (GSH), during deacclimation. The activities of superoxide dismutase (SOD) (EC. 1.15.1.1.) and guaiacol peroxidase (PO) (EC. 1.11.1.7.) also decreased significantly. The activity of catalase (CAT) (EC. 1.11.1.6.) did not change significantly. Levels of low-molecular weight antioxidants (AsA, FL and GSH) and SOD activity were correlated significantly with freezing tolerance in the studied populations. The reactions were similar in all populations. This suggests that the response of the antioxidant system depends more strongly on climatic conditions than on population origin. The ability of spruce trees to cope with active oxygen species is discussed as an aspect of defense and a factor associated with freezing tolerance.
2
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Differential effects of spring reacclimation and deacclimation on cell membranes of Norway spruce seedlings

100%
Pukacki P. M., Kaminska-Rozek E.
Acta Societatis Botanicorum Poloniae
|
2013
|
tom 82
|
nr 1
3

Reactive oxygen species and antioxidants status during dehardening of Norway spruce provenances

100%
Kaminska-Rozek E., Pukacki P. M.
Acta Physiologiae Plantarum
|
2004
|
tom 26
|
nr 3 suppl.
4

Effect of water deficit on oxidative stress and degradation of cell membranes in needles of Norway spruce [Picea abies]

100%
Kaminska-Rozek E., Pukacki P. M.
Acta Physiologiae Plantarum
|
2004
|
tom 26
|
nr 4
5

Response of antioxidative enzymes to long term cold and light stress of spruce seedlings

100%
Kaminska-Rozek E., Pukacka P. M.
Biological Letters
|
2005
|
tom 42
|
nr 2 Spec.Vol.
6

Effect of freezing dehydration on antioxidant system and cold tolerance in Norway spruce [Picea abies [L.] Karst.] seedlings

100%
Kaminska-Rozek E., Pukacki P. M.
Polish Journal of Natural Sciences. Supplement
|
2003
|
tom 01
7
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Effect of freezing desiccation on cold hardiness, ROS, membrane lipid levels and antioxidant status in spruce seedlings

100%
Kaminska-Rozek E., Pukacki P. M.
Acta Societatis Botanicorum Poloniae
|
2005
|
tom 74
|
nr 3
The symptoms of oxidative stress and antioxidative response were investigated on Norway spruce seedlings subjected to freezing desiccation conditions. Three-year-old seedlings were exposed to freezing desiccation at -3oC and -10oC for 45 days in two acclimation stages: autumn (October) and winter (January). The stress enhanced the production of reactive oxygen species (ROS): superoxide radical anion (O2.-), and hydrogen peroxide (H2O2). Concentrations of low molecular antioxidants: glutathione (GSH), ascorbic acid (AsA) and a-tocopherol declined at both low temperatures and acclimation stages. The activity of superoxide dismutase (SOD) increased with ROS production, while guaiacol peroxidase (POX) activity decreased. The freeze-induced desiccation of needles was significantly correlated with the cold hardiness (LT50), the level of low-molecular antioxidants, and POX activity, but not with SOD activity. Under extreme freezing desiccation conditions, these reactions continued, leading to the degradation of membrane phospholipids and a strong decrease in cold hardiness. The results show that membranes are the primary site of injury induced by ROS, produced under the influence of low temperature combined with dehydration. The acclimation response of Norway spruce needles to the oxidative stress generated by long-term cold and/or freezing desiccation is discussed.
8

Long-term implications of industrial pollution stress on lipids composition in Scots pine [Pinus sylvestris L.] roots

100%
Pukacki P. M., Kaminska-Rozek E.
Acta Physiologiae Plantarum
|
2002
|
tom 24
|
nr 3
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