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Plant and Cell Physiology Advance Access published online on January 19, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci010
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Plant and Cell Physiology 2005 © The Japanese Society of Plant Physiologists (JSPP); all rights researved.
Received August 26, 2004
Accepted October 21, 2004

Regular Paper

Involvement of the Chloroplast Signal Recognition Particle cpSRP43 in Acclimation to Conditions Promoting Photooxidative Stress in Arabidopsis

Markus Klenell 1, Shigeto Morita 1, Mercedes Tiemblo-Olmo 1, Per Mühlenbock 1, Stanislaw Karpinski 2*, and Barbara Karpinska 1

1 Department of Botany, Stockholm University, SE-106 91 Stockholm, Sweden
2 Department of Botany, Stockholm University, SE-106 91 Stockholm, Sweden; Department of Plant Physiology, Umeå University and Umeå Plant Science Centre, SE-901 85 Umeå, Sweden

* To whom correspondence should be addressed.
Stanislaw Karpinski, E-mail: Stanislaw.Karpinski{at}botan.su.se


  Abstract

In this paper we have investigated the role of the CAO gene (coding for the chloroplast recognition particle cpSRP43) in the protection against and acclimation to environmental conditions that promote photooxidative stress. Deficiency of cpSRP43 in the Arabidopsis mutant chaos has previously been shown to lead to partial loss of a number of proteins of the photosystem II (PSII) antennae. In addition, as reported here, mutant plants have lower growth rates and reduced lignin contents under laboratory conditions. However, chaos seedlings showed significantly higher tolerance to photooxidative stress under both tightly controlled laboratory conditions and highly variable conditions in the field. This greater tolerance of chaos plants was manifested in less photooxidative damage together with faster growth recovery in young seedlings. It was also associated with a lower production of H2O2, lower ascorbate levels and less induction of ascorbate peroxidases. Under field conditions chaos exhibited better overall photosynthetic performance and had higher survival rates. Expression of the CAO gene may be regulated by a light-dependent chloroplastic redox-signalling pathway, and was inhibited during acclimation to high light and chilling temperatures, simultaneously with induction of ascorbate peroxidases. It is concluded that presence/absence of the CAO gene has an impact on the plants susceptibility to photooxidative stress, and regulation of the CAO gene may be part of the plants system for acclimation to high light.

Keywords: Ascorbate peroxidase; abiotic stress tolerance; hydrogen peroxide; photooxidative stress; signal recognition particle.
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[Abstract] [Full Text] [PDF]


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