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THE PLANT CELL, Vol 2, Issue 5 469-478, Copyright © 1990 by American Society of Plant Biologists
Differential Expression of the Arabidopsis 2S Albumin Genes and the Effect of Increasing Gene Family Size
P. Guerche, C. Tire, F. G. de Sa, A. De Clercq, M. Van Montagu and E. Krebbers
Plant Genetic Systems, Josef Plateaustraat 22, B-9000 Gent, Belgium
We studied the expression of the four genes encoding 2S albumin seed
storage proteins (at2S1 to at2S4) in Arabidopsis thaliana. All four genes
followed similar temporal profiles throughout development, but at2S2 and
at2S3 were expressed at significantly higher levels than at2S1 or at2S4. In
situ hybridization showed that at2S2 to at2S4 mRNAs were present throughout
the embryo, whereas at2S1 was expressed at levels similar to at2S2 and
at2S3 in the embryo axis but at only insignificant levels in the
cotyledons. The different members of the gene family are, thus, likely to
be regulated by different combinations of cis-acting elements, but it
cannot be ruled out that post-transcriptional factors play a role. We
studied the effect of enlarging the gene family by introducing an extra,
nearly identical gene driven by the promoter of at2S1. The data were
consistent with a model in which the expression of at2S2 to at2S4 is not
affected by that of at2S1, and in which, at least at low copy numbers of
the introduced gene, there is no limit on the overall amount of RNA that
the at2S gene family can produce.
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