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Science 5 July 2002:
Vol. 297. no. 5578, pp. 91 - 93
DOI: 10.1126/science.1072359
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Reports

Rapid Regulation of Light Harvesting and Plant Fitness in the Field

Carsten Külheim,1 Jon Ågren,2 Stefan Jansson1*

We used Arabidopsis thaliana mutants to examine how a photosynthetic regulatory process, the qE-type or Delta pH-dependent nonphotochemical quenching, hereafter named feedback de-excitation, influences plant fitness in different light environments. We show that the feedback de-excitation is important for plant fitness in the field and in fluctuating light in a controlled environment but that it does not affect plant performance under constant light conditions. Our findings demonstrate that the feedback de-excitation confers a strong fitness advantage under field conditions and suggest that this advantage is due to the increase in plant tolerance to variation in light intensity rather than tolerance to high-intensity light itself.

1 Umeå Plant Science Center, Department of Plant Physiology, Umeå University, SE-901 87 Umeå, Sweden.
2 Department of Plant Ecology, Evolutionary Biology Centre, Uppsala University, Villavägen 14, SE-752 36 Uppsala, Sweden.
*   To whom correspondence should be addressed. E-mail: stefan.jansson{at}plantphys.umu.se

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