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Photosystem I Is an Early Target of Photoinhibition in Barley Illuminated at Chilling Temperatures1

Staffan Erling Tjus*, Birger Lindberg Møller, and Henrik Vibe Scheller

Plant Biochemistry Laboratory, Department of Plant Biology, Royal Veterinary and Agricultural University, Thorvaldsensvej 40, DK-1871 Fredriksberg C, Copenhagen, Denmark

Light-induced damage to photosystem I (PSI) was studied during low-light illumination of barley (Hordeum vulgare L.) at chilling temperatures. A 4-h illumination period induced a significant inactivation of PSI electron transport activity. Flash-induced P700 absorption decay measurements revealed progressive damage to (a) the iron-sulfur clusters FA and FB, (b) the iron-sulfur clusters FA, FB, and FX, and (c) the phylloquinone A1 and the chlorophyll A0 or P700 of the PSI electron acceptor chain. Light-induced PSI damage was also evidenced by partial degradation of the PSI-A and PSI-B proteins and was correlated with the appearance of smaller proteins. Aggravated photodamage was observed upon illumination of barley leaves infiltrated with KCN, which inhibits Cu,Zn-superoxide dismutase and ascorbate peroxidase. This indicates that the photodamage of PSI in barley observed during low-light illumination at chilling temperatures arises because the defense against active oxygen species by active oxygen-scavenging enzymes is insufficient at these specific conditions. The data obtained demonstrate that photoinhibition of PSI at chilling temperatures is an important phenomenon in a cold-tolerant plant species.

1   This work was financed by a grant to S.E.T. from the Energy Research Program of the Nordic Council of Ministers, and by the Danish Center for Plant Biotechnology.
*   Corresponding author; e-mail set{at}kvl.dk; fax 45-35-28-3333.

Plant Physiol. (1998) 116: 755-764
Copyright Clearance Center:   0032-0889/98/116/0755/10
© 1998 American Society of Plant Physiologists




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