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Nucleic Acids Research, 1990, Vol. 18, No. 11 3377-3385
© 1990

MOLECULAR BIOLOGY

A potential role for RNA turnover in the light regualtion of plant gene expression: ribulose-1, 5-bisphosphate carboxylase small subunit in soybean

B.W. Shirley+ and R.B. Meagher*

Department of Genetics, University of Georgia, Athens Georgia 30602, USA

*To whom correspondence should be addressed

Received October 26, 1989. Accepted April 20, 1990.

Post-transcriptional regulation of the genes encoding the small subunit (rbcS) of ribulose-1,5-bisphosphate carboxylase was examined in soybean seedlings. Substantial discrepancies were detected between relative in vitro transcription rates and steady-state RNA levels in light- and dark-grown seedling leaves, indicating that rbcS RNA may be degraded more rapidly in light than in darkness. Additional data imply that the turnover mechanism is rapidly induced by light, maintained for some time in darkness, and that it may be negatively controlled by far-red light. The proposed RNA turnover system does not affect all RNAs equally since a soybean actin gene showed equivalent in vitro transcription rates and RNA levels in light and darkness. Soybean rbcS genes may be subject to a novel mode of control in which light-induced expression is accompanied by an increased rate of RNA degradation. Models for the specific regulation of rbcS RNA stability in response to light are presented.

+Present address: Department of Molecular Biology, Massachusetts General Hospital, Boston, MA 02114, USA


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