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Plant and Cell Physiology Advance Access published online on January 19, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci012
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Plant and Cell Physiology 2005 © The Japanese Society of Plant Physiologists (JSPP); all rights researved.
Received September 11, 2004
Accepted November 3, 2004

Regular Paper

Light-Induced Wilting and Its Molecular Mechanism in Epicotyls of Dark-Germinated Pea (Pisum sativum L.) Seedlings

Noémi Erdei 1, Csengele Barta 2, Éva Hideg 2, and Béla Böddi 1*

1 Department of Plant Anatomy, Eötvös University, Pázmámy P. s. 1/c H-1117, Budapest, Hungary
2 Institute of Plant Biology, Biological Research Centre, H-6701 Szeged, P.O.Box 521, Hungary

* To whom correspondence should be addressed.
Béla Böddi, E-mail: bbfotos{at}ludens.elte.hu


  Abstract

Possible mechanisms behind the light-induced wilting of dark-germinated pea (Pisum sativum L.) epicotyls were studied. Illumination with photosynthetically active radiation caused a fast turgor loss and wilting in the middle segments of the epicotyls accompanied with accumulation of water in the intercellular cavities. During this process, room-temperature fluorescence emission spectra showed gradual bleaching of porphyrin-type pigments, which was lessened by incubating the epicotyls with excess ascorbate before illumination. Detection of singlet oxygen and lipid peroxidation products in the illuminated epicotyls suggested the occurrence of porphyrin-photosenzitized membrane damage as a cause of disordered water status and sequential wilting.

Keywords: Chlorophyllous pigments; lipid peroxidation; pea epicotyl; photooxidative; protochlorophyllide; singlet oxygen.
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