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Plant and Cell Physiology Advance Access originally published online on January 19, 2005
Plant and Cell Physiology 2005 46(1):185-191; doi:10.1093/pcp/pci012
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© 2005 Oxford University Press

Light-induced Wilting and its Molecular Mechanism in Epicotyls of Dark-germinated Pea (Pisum sativum L.) Seedlings

Noémi Erdei1, Csengele Barta2, Éva Hideg2 and Béla Böddi1,3

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, PO Box 521, Hungary

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 by 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.

3 Corresponding author: E-mail, bbfotos{at}ludens.elte.hu; Fax, +36-1-3812166.

(Received September 11, 2004; Accepted November 3, 2004)


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