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THE PLANT CELL, Vol 5, Issue 9 1089-1099, Copyright © 1993 by American Society of Plant Biologists
Fungal Elicitor-Induced Bean Proline-Rich Protein mRNA Down-Regulation Is Due to Destabilization That Is Transcription and Translation Dependent
S. Zhang, J. Sheng, Y. Liu and M. C. Mehdy
Department of Botany, University of Texas at Austin, Austin, Texas 78713
In bean cells treated with fungal elicitor, the transcripts of PvPRP1, a
gene encoding a proline-rich protein, decreased to ~6% of the original
level within 4 hr. The apparent mRNA half-life during the period of rapid
degradation was ~45 min. The rate of PvPRP1 gene transcription remained
constant over this period, as determined by nuclear run-off assays,
indicating a decrease in mRNA stability. By using actinomycin D to block
transcription, the half-life of PvPRP1 mRNA in unelicited cells was
estimated to be ~60 hr. In cells treated with actinomycin D followed by the
addition of elicitor, the PvPRP1 mRNA half-life was ~18 hr, whereas cells
treated with these reagents in reciprocal order exhibited a half-life of ~6
hr. The protein synthesis inhibitors emetine and anisomycin also inhibited
the rate of PvPRP1 mRNA degradation in elicited cells. Based on these data,
we concluded that the rapid decrease in the PvPRP1 mRNA level in elicited
cells is due to destabilization, which is dependent on new RNA and protein
synthesis.
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