Abstract
Signal-activated phospholipase A2 cleavesphosphatidylcholine (PC) into free fatty acids and LPC, respectively.Using bis-BODIPY-PC as an indicator substrate for phospholipaseA2 which is taken up by parsley cells, active auxins atconcentrations as low as 1 μM and a fungal elicitor induced fattyacid-accumulation. Nordihydroguajaretic acid inhibited the accumulationof fatty acid induced by the elicitor. In addition to this, theelicitor, but not auxin, decreased the pool size of diacylglycerol,which seemed to originate from a PC-splitting phospholipase C, whichwould be a new enzyme in plant signal transduction. However, thiselicitor is known to rapidly increase cytosolic calcium in parsley cellsand this activates phospholipase C. Thus, activation of phospholipase Cshould lead to an increase of diacylglycerol and not to a decrease whichmight indicate a discrepancy between animal and plant phospholipidsignal transduction.
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