[Seminars] PSB event reminder
contact at psb.vib-ugent.be
contact at psb.vib-ugent.be
Wed Dec 15 11:10:01 CET 2010
Calendar Name: seminars
Scheduled for: Friday, December 17 2010, 11:00 - 12:30
Event text: Alexis Maizel
Department of Stem Cell Biology
Center for organismal studies
University of Heidelberg
Heidelberg
GERMANY
Details: "Control of developmental plasticity and robustness by
small RNAs in Arabidopsis"
ABSTRACT
Plants adapt to their environment by forming new organs
throughout their entire postembryonic life. The
harmonious growth of these organs in response to
morphogenetic signals is essential. Lateral roots
unceasingly branch from the main root in response to
local auxin maxima. How a local maximum translates to a
robust pattern of gene activation ensuring the proper
growth of the newly formed root is not known. The
TAS3-derived trans-acting siRNAs (ta-siRNAs) belong to a
plant-specific class of endogenous small RNAs, whose
biogenesis requires the initial microRNA 390
(miR390)-mediated cleavage of the TAS3 precursor by
AGO7. The ta-siRNAs target mRNAs encoding ARF3/ETTIN and
ARF4 which are transcription factors of the AUXIN
RESPONSE FACTORs that mediate the effects of auxin. I
will present recent results establishing that auxin
maxima at the sites of lateral root initiation promote
localised production of miR390, allowing the formation
of ta-siARFs to subsequently inhibit ARF3/4 activity in
the incipient primordia. In turn, ARF3 and ARF4
contribute both positively and negatively to miR390
accumulation. These results support a model in which
small RNAs employ target genes to regulate their own
production.
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