Abstract
With the aim of examining the response of plant cells to UV-C irradiation, we investigated the behaviour of the phosphatidylinositol 4,5 bisphosphate (PtdIns 4,5-P 2) molecule (the precursor of the phosphoinositide signal transduction cascade) by exposing callus cells from Peucedanum verticillare to UV-C (130 J m −2) and by examining the level and the fatty acid composition of PtdIns 4,5-P 2 at different times after irradiation. We show that a pathway for the UV-C response includes transient PtdIns 4,5-P 2 breakdown. The effect of ultraviolet rays is mimicked by H 2O 2 suggesting that in this plant it may be brought about by reactive oxygen intermediates (ROI), as already underlined in experimental animal models.
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