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PubMed2002

Processing of bisphenol A by plant tissues: glucosylation by cultured BY-2 cells and glucosylation/translocation by plants of Nicotiana tabacum.

Bisphenol A (BPA, 4,4'-isopropylidenediphenol), an endocrine disrupter with estrogenic properties, was supplied to tobacco BY-2 cells in suspension culture and the chemical nature of its metabolites was investigated. The concentration of BPA in the culture medium decreased rapidly and became undetectable at 2.5 h after the application. Four metabolites of BPA were observed in a methanol extract of the cells when the culture was supplemented with [(14)C]BPA. The most abundant metabolite was determined to be 4,4'-isopropylidenediphenol-O-beta-D-glucopyranoside (BPAG) by mass spectrometry, nuclear magnetic resonance spectroscopy and by hydrolysis with beta-glucosidase. This identification was confirmed by synthesis. When [(14)C]BPA was administrated to tobacco seedlings from their roots, radioactivity was incorporated in BPAG and three unidentified metabolites. These metabolites were accumulated in the leaves after 4 h exposure, indicating that tobacco seedlings absorbed BPA through their root systems, metabolized to its beta-glucoside and translocated the metabolites to their leaves.

Benzhydryl Compounds↗
PubMed1994

Biochemical Plant Responses to Ozone (IV. Cross-Induction of Defensive Pathways in Parsley (Petroselinum crispum L.) Plants).

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.

Journal Article↗