NDLI: ROS production and antioxidative system activity in embryonic axes of Quercus robur seeds under different desiccation rate conditions

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ROS production and antioxidative system activity in embryonic axes of Quercus robur seeds under different desiccation rate conditions

Content Provider	Springer Nature Link
Author	Pukacka, Stanislawa Malec, Marek Ratajczak, Ewelina
Copyright Year	2011
Abstract	The seeds of pedunculate oak (Quercus robur L.) were subjected to slow (S) and rapid (R) desiccation at desiccation rates of 0.16 and 0.39% H$_{2}$O per hour, respectively. Till ca. 40% water content (WC) the germination capacity of seeds in the S and R variants was high (ca. 100%). Between 40 and 28% WC, germination capacity declined to 20 and 50% in S and R variants, respectively. The decrease in seed viability was accompanied by a significant increase of electrolyte leakage from embryonic axes (28% for S and 15% for R variants). In the embryonic axes of seeds subjected to slow desiccation, malondialdehyde (MDA) and free fatty acid (FFA) contents were significantly higher than those in R variants, indicating greater membrane damage due to lipid peroxidation. The production of ROS (H$_{2}$O$_{2}$ and O 2 ·− ) was significantly higher in S than in R variants. The low molecular weight antioxidants α-tocopherol, ascorbic acid (ASA), and phenolic compounds indicated different reactions in response to desiccation stress. ASA levels decreased during desiccation to a similar degree in both the S and R variants. A significant decrease of total phenols was observed in R variant, which coincided with a significant increase of guaiacol peroxidase (POX) activity. α-Tocopherol content was significantly higher in the embryonic axes of seeds subjected to rapid drying. The activities of the enzymatic scavengers APX and GR had similar runs and were slightly higher in R variant. The activities of POX and SOD were significantly higher in the embryonic axes of seeds subjected to rapid drying. These results show that rapid dehydration of Q. robur seeds leads to the greater mobilization of antioxidant system in embryonic axes, particularly increased levels of α-tocopherol and POX and SOD activities, in the first stages of water loss. This mobilization has a greater impact on maintenance of higher viability of seeds after drying to lower level of WC.
Starting Page	2219
Ending Page	2227
Page Count	9
File Format	PDF
ISSN	01375881
Journal	Acta Physiologiae Plantarum
Volume Number	33
Issue Number	6
e-ISSN	18611664
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-04-10
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ascorbic acid Ascorbate peroxidase Desiccation Glutathione reductase Guaiacol peroxidase Hydrogen peroxide Phenols Superoxide Superoxide dismutase α-Tocopherol Agriculture Plant Pathology Plant Physiology Plant Anatomy/Development Plant Biochemistry Plant Genetics & Genomics
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science Agronomy and Crop Science

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