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Journal archive > 2013 > N 3 May-June

REACTIVE OXYGEN FORMS AND Ca IONS AS POSSIBLE INTERMEDIARIES
UNDER THE INDUCTION OF HEAT RESISTANCE OF PLANT CELLS BY JASMONIC ACID

Yu. V. Karpets, Yu. E. Kolupaev, T. O. Yastreb, O. I. Oboznyi, M. V. Shvydenko, G. A. Lugova, A. O. Vayner

Dokuchayev Kharkiv National Agrarian University, Ukraine;
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The participation of reactive oxygen species (ROS) and calcium ions in realization of influen­ce of exogenous jasmonic acid (JA) on the heat resistance of wheat coleoptiles has been investigated­. Influence of 1 µM JA caused the transitional intensifying of generation of superoxide anion-radi­cal (O2•–) and hydrogen peroxide in coleoptiles with the maximum within 15-30 minutes after the treatment beginning. Within the first hour after the beginning of coleoptiles treatment with JA the increase of superoxide dismutase (SOD) activi­ty was noted. Later on (within 5-24 hours after the treatment beginning) there was the lowering of ROS generation by coleoptiles of experimental variant, and the SOD activity approached the control value. Intensifying of generation of superoxi­de radical induced by JA was suppressed by the antioxidant ionol and was partially levelled by imidazole (inhibitor of NADPH-oxidase), EGTA (chelator of extracellular calcium) and lanthanum chloride (calcium channels blocker). Pretreatment of coleoptiles with the ionol, imidazole, EGTA and LaCl3 also partially removed the effect of increase of their resistance to the damaging heating caused by exogenous JA. It is supposed that the ROS gene­rated with participation NADPH-oxidase, which activity depends on the receipt of calcium ions from extracellular space in the cytosol, are involved in realization of physio­logical effects of JA.

Key words: Triticum aestivum L., jasmonic acid, reactive oxygen species, NADPH-oxidase, calcium, heat resistance.

The original article in Russian is available for download in PDF format.

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