[Seminars] PSB event reminder
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Sat Sep 4 11:10:01 CEST 2010
Calendar Name: seminars
Scheduled for: Monday, September 6 2010, 11:00 - 12:30
Event text: Prof Maria Helena S. Goldman
Department of Biology, FFCLRP, University of São Paulo
BRAZIL
Details: "SCI1, A TISSUE-SPECIFIC CELL CYCLE REGULATOR THAT
CONTROLS STIGMA/STYLE DEVELOPMENT"
ABSTRACT
The success of plant reproduction depends on the
appropriate development of the reproductive organs,
which involves general and specific regulatory networks.
We have characterized a gene, SCI1 (stigma/style cell
cycle inhibitor 1), encoding a nuclear small lysine-rich
protein that exerts an inhibitory action on cell cycle.
qRT-PCR and in situ hybridization experiments showed
that SCI1 is stigma/style-specific and developmentally
regulated. SCI1 RNAi knockdown and overexpression
transgenic plants exhibited stigmas/styles with
remarkably enlarged and reduced areas, respectively, due
to differences in cell numbers. Alterations on SCI1
expression affected cell divisions on the stigmatic
secretory zone (SSZ) and the differentiation timing of
the papillar cells. Taken together, our results reveal
that SCI1 is a novel tissue-specific negative cell cycle
regulator that couples stigma cell division and
differentiation. Additionally, two-hybrid and BiFC
experiments showed that SCI1 interacts with A-type
cyclins. We conclude that SCI1 represents a novel
developmentally regulated tissue-specific gene that
controls cell proliferation/differentiation, probably as
a component of a signaling pathway involved in upper
pistil development.
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