Regulation of Steroid Glycoalkaloid and Sesquiterpenoid Stress Metabolite Accumulation in Potato Tubers by Inhibitors of Steroid Synthesis and Phytohormones in Combination with Arachidonic Acid
The polyunsaturated fatty acids, arachidonic (AA) and eicosapentaenoic (EPA), both constituents of Phytophthora infestans, reproduce the hyper-sensitive response when applied to the surface of potato tuber slices . Their effect involves rapid, but localized cell death, browning of the tissue, leakage of electrolytes and foremost, marked inhibition of steroid glycoalkaloid (SGA) accumulation with parallel elicitation of sesquiterpenoid stress metabolites (SSM) accumulation [1,2]. This study refers to the effect of chemicals which inhibit steroid synthesis in fungi and plants such as sterol-inhibiting fungicides [3,4,5] on potato tuber slices. Research concentrated on their effects on SGA and SSM accumulation. The assumption that AA and EPA have a hormonal effect by inhibiting or promoting biochemical processes like phytohormones, justified experimental work on the effect of the main phytohormones indole-3- acetic acid, gibberellic acid and abscisic acid on potato tuber slices. The latter has been reported to affect SSM accumulation in applications with AA . Our aim was to elucidate the mode of action of AA as an elicitor of SSM.
KeywordsChloroform Pyrimidine Triazole Lecithin Pyrophosphate
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