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Plant Physiol, September 2001, Vol. 127, pp. 150-158
The Properties of the Chlorophyll a/b-Binding
Proteins Lhca2 and Lhca3 Studied in Vivo Using Antisense
Inhibition1
Ulrika
Ganeteg,*
Åsa
Strand,
Petter
Gustafsson, and
Stefan
Jansson
Umeå Plant Science Center, Department of Plant Physiology, Umeå
University, S-901 87 Umeå, Sweden
The specific functions of the light-harvesting proteins Lhca2 and
Lhca3 were studied in Arabidopsis ecotype Colombia antisense plants in
which the proteins were individually repressed. The antisense effect
was specific in each plant, but levels of Lhca proteins other than the
targeted products were also affected. The contents of Lhca1 and Lhca4
were unaffected, but Lhca3 (in Lhca2-repressed plants) was almost
completely depleted, and Lhca2 decreased to about 30% of wild-type
levels in Lhca3-repressed plants. This suggests that the Lhca2 and
Lhca3 proteins are in physical contact with each other and that they
require each other for stability. Photosystem I fluorescence at 730 nm
is thought to emanate from pigments bound to Lhca1 and Lhca4. However,
fluorescence emission and excitation spectra suggest that Lhca2 and
Lhca3, which fluoresce in vitro at 680 nm, also could contribute to
far-red fluorescence in vivo. Spectral forms with absorption maxima at 695 and 715 nm, apparently with emission maxima at 702 and 735 nm,
respectively, might be associated with Lhca2 and Lhca3.
1
This work was supported by grants from the
Swedish Forestry and Agricultural Research Council.
*
Corresponding author; e-mail ulrika.ganeteg{at}plantphys.umu.se;
fax 46-90-7866676.
© 2001 American Society of Plant Physiologists
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