biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 58:71-79, 2014 | DOI: 10.1007/s10535-013-0362-9

Dynamics of heat-shock induced DNA damage and repair in senescent tobacco plants

P. Cvjetko1,*, B. Balen1, P. Peharec Štefanić1, L. Debogović1, M. Pavlica1, G. I. V. Klobučar2
1 Department of Molecular Biology, Faculty of Science, University of Zagreb, Zagreb, Croatia
2 Department of Zoology, Faculty of Science, University of Zagreb, Zagreb, Croatia

Oxidative stress plays an important role in plant ageing and in response to different stresses. Oxidative DNA damage, unless repaired, may have detrimental consequences and increase genetic instability. Therefore, we determined the role of heat-shock induced oxidative stress on induction and repair of DNA damage in relation to oxidative stress tolerance in senescent tobacco plants. One-month-old (young) and three-month-old (senescent) plants were exposed to 42 °C for 2 and 4 h and left to recover at 26 °C for 24 and 72 h. The progression of senescence was characterized by the lower soluble protein and malondialdehyde content compared to young plants. Immediately after the heat shock, an increase in lipid peroxidation and guaiacol peroxidase activity, as well as DNA damage measured by the Comet assay were induced to higher extent in the young plants than in the senescent ones compared to their respective controls. Moreover, after 24-h recovery, the DNA damage further increased in the young plants whereas tendency of DNA repair was observed in the senescent plants. Upon 72-h recovery, no significant differences were noticed in all parameters studied (regardless of plant age) compared to the controls. The random amplified polymorphic DNA (RAPD) analysis confirmed genetic stability of the tobacco plants during the heat-shock exposures as well as the subsequent recovery periods.

Keywords: Comet assay; DNA polymorphism; oxidative stress; RAPD; temperature stress
Subjects: heat-shock; temperature - high; DNA damage; senescence; comet assay; DNA polymorphism; oxidative stress; tobacco; malondialdehyde; glutatione peroxidase

Received: February 22, 2013; Revised: April 12, 2013; Accepted: April 23, 2013; Published: March 1, 2014  Show citation

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Cvjetko, P., Balen, B., Peharec Štefanić, P., Debogović, L., Pavlica, M., & Klobučar, G.I.V. (2014). Dynamics of heat-shock induced DNA damage and repair in senescent tobacco plants. Biologia plantarum, 58(1), 71-79. doi: 10.1007/s10535-013-0362-9
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