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THE PLANT CELL, Vol 2, Issue 8 795-803, Copyright © 1990 by American Society of Plant Biologists
Light-Mediated Control of Translational Initiation of Ribulose-1,5-Bisphosphate Carboxylase in Amaranth Cotyledons
J. O. Berry, D. E. Breiding and D. F. Klessig
Waksman Institute, Rutgers, The State University of New Jersey, P.O. Box 759, Piscataway, New Jersey 08855
In cotyledons of 6-day-old amaranth seedlings, the large subunit (LSU) and
the small subunit (SSU) polypeptides of ribulose-1,5-bisphosphate
carboxylase are not synthesized in the absence of light. When dark-grown
seedlings were transferred into light, synthesis of both polypeptides was
induced within the first 3 to 5 hr of illumination without any significant
changes in levels of their mRNAs. In cotyledons of light-grown seedlings
and of dark-grown seedlings transferred into light for 5 hr (where
ribulose-1,5-bisphosphate carboxylase synthesis was readily detected in
vivo), the LSU and SSU mRNAs were associated with polysomes. In cotyledons
of dark-grown seedlings, these two mRNAs were not found on polysomes. In
contrast to the SSU message, mRNAs encoding the nonlight-regulated,
nuclear-encoded proteins actin and ubiquitin were associated with polysomes
regardless of the light conditions. Similarly, mRNA from at least one
chloroplast-encoded gene (rpl2) was found on polysomes in the dark as well
as in the light. These results indicate an absence of translational
initiation in cotyledons of dark-grown seedlings which is specific to a
subset of nuclear- and chloroplast-encoded genes including the SSU and LSU,
respectively. Upon illumination, synthesis of both polypeptides, and
possibly other proteins involved in light-mediated chloroplast development,
was induced at the level of translational initiation.
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