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PLANT PHYSIOLOGY , Vol 115, Issue 4 1525-1531, Copyright © 1997 by American Society of Plant Biologists
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GENE REGULATION AND MOLECULAR GENETICS |
Antisense Inhibition of the Photosystem I Antenna Protein Lhca4 in Arabidopsis thaliana
H. Zhang, H. M. Goodman and S. Jansson
Department of Biological Sciences, Texas Tech University, Lubbock, Texas 79409 (H.Z.)
The function of Lhca4, a gene encoding the photosystem I type IV
chlorophyll a/b-binding protein complex in Arabidopsis, was investigated
using antisense technology. Lhca4 protein was reduced in a number of mutant
lines and abolished in one. The inhibition of protein was not correlated
with the inhibition of mRNA. No depletion of Lhca1 was observed, but the
low-temperature fluorescence emission spectrum was drastically altered in
the mutants. The emission maximum was blue-shifted by 6 nm, showing that
chlorophyll molecules bound to Lhca4 are responsible for most of the
long-wavelength fluorescence emission. Some mutants also showed an
unexplainable delay in flowering time and an increase in seed weight.
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