Translational Control of Arabidopsis Meristem Stability and Organogenesis by the Eukaryotic Translation Factor eIF3h

Zhou, Fujun; Roy, Bijoyita; Dunlap, John R.; Enganti, Ramya; von Arnim, Albrecht G.

doi:10.1371/journal.pone.0095396

Title: Translational Control of Arabidopsis Meristem Stability and Organogenesis by the Eukaryotic Translation Factor eIF3h

Journal Article · Tue Apr 15 00:00:00 EDT 2014 · PLoS ONE

DOI:https://doi.org/10.1371/journal.pone.0095396· OSTI ID:1904581

Zhou, Fujun ^[1]; Roy, Bijoyita ^[1]; Dunlap, John R. ^[1]; Enganti, Ramya ^[1]; von Arnim, Albrecht G. ^[1]

University of Tennessee, Knoxville, TN (United States)

Essentially all aboveground plant tissues develop from the stem cells in the primary shoot apical meristem. Proliferation of the stem cell population in the Arabidopsis shoot apical meristem is tightly controlled by a feedback loop formed primarily by the homeodomain transcription factor WUSCHEL (WUS) and the CLAVATA ligand-receptor system. In this study, it is shown that mutation of a translation initiation factor, eIF3h, causes a tendency to develop a strikingly enlarged shoot apical meristem with elevated and ectopic expression of WUS and CLAVATA3 (CLV3). Many of the mRNAs that function in apical meristem maintenance possess upstream open reading frames (uORFs), translational attenuators that render translation partially dependent on eIF3h. Specifically, the mRNA for the receptor kinase, CLV1, is undertranslated in the eif3h mutant as shown by transient and transgenic expression assays. Concordant phenotypic observations include defects in organ polarity and in translation of another uORF-containing mRNA, ASYMMETRIC LEAVES 1 (AS1), in eif3h. In summary, the expression of developmental regulatory mRNAs is attenuated by uORFs, and this attenuation is balanced in part by the translation initiation factor, eIF3h. Thus, translational control plays a key role in Arabidopsis stem cell regulation and organogenesis.

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Research Organization:: Univ. of Tennessee, Knoxville, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-96ER20223; IS3901-06C

OSTI ID:: 1904581

Journal Information:: PLoS ONE, Vol. 9, Issue 4; ISSN 1932-6203

Publisher:: Public Library of ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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