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THE PLANT CELL, Vol 6, Issue 7 1007-1019, Copyright © 1994 by American Society of Plant Biologists

RESEARCH ARTICLES

Oat Phytochrome A mRNA Degradation Appears To Occur Via Two Distinct Pathways

D. C. Higgs and J. T. Colbert
Department of Botany and Molecular, Cellular, and Developmental Biology Program, Iowa State University, Ames, Iowa, 50011-1020

We have identified possible mechanisms for the degradation of oat phytochrome A (PHYA) mRNA. The majority of PHYA mRNA molecules appeared to be degraded prior to removal of the poly(A) tail, a pathway that differs from that reported for the degradation of other eukaryotic mRNAs. Polyadenylated PHYA mRNA contained a pattern of putative degradation products that is consistent with a 5[prime]->3[prime] exoribonuclease, although the participation of a stochastic endoribonuclease cannot be excluded. The poly(A) tail of PHYA mRNA was heterogeneous in size and ranged from ~14 to 220 nucleotides. Early PHYA mRNA degradation events did not appear to involve site-specific endoribonucleases. Approximately 25% of the apparently full-length PHYA mRNA was poly(A) deficient. Oat H4 histone, [beta]-tubulin, and actin mRNA populations had lower amounts of apparently full-length mRNAs that were poly(A) deficient. Degradation of the poly(A)-deficient PHYA mRNA, a second pathway, appeared to be initiated by a 3[prime]->5[prime] exoribonucleolytic removal of the poly(A) tail followed by both 5[prime]->3[prime] and 3[prime]->5[prime] exoribonuclease activities. Polysome-associated RNA contained putative PHYA mRNA degradation products and was a mixture of polyadenylated and deadenylated PHYA messages, suggesting that the two distinct degradation pathways are polysome associated.


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