Abstract
Germination of lupine (Lupinus luteus L.) seeds was accompanied by an increase in concentration of free radicals with g 1 and g 2 values of 2.0056 ± 0.0003 and 2.0033 ± 0.0005, respectively. The highest intensity of free radical signal was observed in embryo axes immediately after radicle protruded through the seed coat. Hydrogen peroxide accumulated in embryonic axes and cotyledons during imbibition before the onset of germination in the seed population. The activities of superoxide dismutase (SOD, EC 1.15.1.1) and catalase (CAT, EC 1.11.1.6) rose progressively in embryo axes. In cotyledons SOD activity did not change significantly, while that of CAT increased during germination. The enhancement of Cu, Zn-SODs and Mn-SOD isoforms in embryonic axes was observed. A new isoform of catalase was synthesized, suggesting that it plays a relevant role during germination. SOD and CAT activities were detected in dry seeds. Free radical generation and response of antioxidative enzymes differed between embryo axes and cotyledons during the germination timecourse.
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Acknowledgements
We thank Dr. Waldemar Bednarski, Institute of Molecular Physics, Polish Academy of Science for his collaboration in EPR studies. This work was supported by State Committee for Scientific Research (KBN), grant 2 P06R 085 26.
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Communicated by S.Weidner.
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Garnczarska, M., Wojtyla, Ł. Differential response of antioxidative enzymes in embryonic axes and cotyledons of germinating lupine seeds. Acta Physiol Plant 30, 427–432 (2008). https://doi.org/10.1007/s11738-008-0138-6
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DOI: https://doi.org/10.1007/s11738-008-0138-6