Induction of a p-coumaroyl trihydroxy triterpene acid in Psylla-infested and mechanically damaged pear trees

Citation
P. Scutareanu et al., Induction of a p-coumaroyl trihydroxy triterpene acid in Psylla-infested and mechanically damaged pear trees, J CHEM ECOL, 25(9), 1999, pp. 2177-2191
Citations number
32
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology
Journal title
JOURNAL OF CHEMICAL ECOLOGY
ISSN journal
0098-0331 → ACNP
Volume
25
Issue
9
Year of publication
1999
Pages
2177 - 2191
Database
ISI
SICI code
0098-0331(199909)25:9<2177:IOAPTT>2.0.ZU;2-U
Abstract
The pattern of induction and the chemical structure of phenolic compounds i n pear trees (Pyrus communis, cv. Conference) that were either infested by pear leaf suckers Psylla pyricola and P. pyri or mechanically damaged, or b oth, were studied. Chromatographic (HPLC) and mass spectral analysis perfor med on extracts of leaf samples collected at various time intervals from tr ees subjected to three treatments demonstrated the induction (and/or amplif ication) of a phenolic compound, identified as 3-O-trans-p-coumaroyltorment ic acid (I). New mass spectrometric data on this phenolic compound are pres ented. HPLC revealed different peak patterns in the course of the period of Psylla infestation and the lapse of time since mechanical damage was infli cted, compared to a control tree. The new phenolic compound became apparent after 12 hr and reached the highest level 30 days after damage by pear lea f suckers. It was also observed after 24 hr at lower intensity in samples f rom a mechanically damaged tree and exclusively on day 30 at very low inten sity in the leaf extracts from the uninfested control trees. We conclude th at damage by pear leaf suckers, and to a lesser extent also mechanical dama ge, induce the synthesis of the new, late-eluting phenolic compound. We pro pose that this compound is involved in plant defense against pear leaf suck ers.