PuSH - Publication Server of Helmholtz Zentrum München: Biochemical plant responses to ozone: IV. Cross-induction of defensive pathways in parsley (<em>Petroselinum crispum</em> L.) plants.

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Eckey-Kaltenbach, H. ; Ernst, D. ; Heller, W. ; Sandermann, H.

Biochemical plant responses to ozone: IV. Cross-induction of defensive pathways in parsley (Petroselinum crispum L.) plants.

Plant Physiol. 104, 67-74 (1994)

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Parsley (Petroselinum crispum L.) is known to respond to ultraviolet irradiation by the synthesis of flavone glycosides, whereas fungal or elicitor stress leads to the synthesis of furanocoumarin phytoalexins. We tested how these defensive pathways are affected by a single ozone treatment (200 nL L-1; 10 h). Assays were performed at the levels of transcripts, for enzyme activities, and for secondary products. The most rapid transcript accumulation was maximal at 3 h, whereas flavone glycosides and furanocoumarins were maximally induced at 12 and 24 h, respectively, after the start of ozone treatment. Ozone acted as a cross-inducer because the two distinct pathways were simultaneously induced. These results are consistent with the previously observed ozone induction of fungal and viral defense reactions in tobacco, spruce, and pine.

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