Journal
PHYTOCHEMISTRY
Volume 66, Issue 3, Pages 313-321Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.phytochem.2004.12.015
Keywords
Petroselinum sativum; cutins; higher plants; senescencc 18-hydroxyoleic acids; photooxidation; singlet oxygen
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9-Hydroperoxy-18-hydroxyoctadec-10(trans)-enoic and 10-hydroperoxy-18-hydroxyoctadec-8(trans)-enoic acids deriving from type II (i.e. involving O-1(2)) photooxidation of 18-hydroxyoleic acid were detected after visible light-induced senescence experiments carried out with Petroselinum sativum and Subsequent cutin depolymerisation. These results showed that in senescent plants, where the O-1(2) formation rate exceeds the quenching capacity of the photoprotective system, O-1(2) can migrate outside the chloroplasts and affect the unsaturated components of cutins. Significant amounts of 9,18-dihydroxyoctadec-10(trans)-enoic and 10,18-dihydroxyoctadec-8(trans)-enoic acids resulting from the reduction of these photoproducts of 18-hydroxyoleic acid were also detected in different natural samples. These results well support the significance of the photooxidation of the unsaturated components of higher plant cutins in the natural environment. (C) 2004 Elsevier Ltd. All rights reserved.
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