Edinburgh, Scotland, United Kingdom - TAIR

ABA and G-protein signaling in Arabidopsis
guard cells
Regulation of stomatal apertures by the phytohormone abscisic acid (ABA)
promotes plant water conservation under drought conditions. ABA induces
stomatal closure via an intricate cellular signaling network. We have applied
systems biology methods to model this process (Li et al, PLoS Biology, 2006),
and have recently characterized the Arabidopsis guard cell proteome with the
goal of identifying new candidate stomatal signaling proteins (Zhao et al, Plant
Cell, 2008). Heterotrimeric G proteins, composed of alpha, beta, and gamma
subunits, are important secondary messengers in ABA signaling (e.g. Fan et al,
PNAS, 2008). Most recently, we have identified two new ABA receptors that
exhibit attributes of both G-protein-coupled receptors (GPCRs) and classic
G-protein alpha subunits (Pandey et al, Cell, 2009). The biochemical and
molecular genetic characterization of these proteins will be described.
33
L08
Thursday 09:30 - 10:00
Environmental Responses
Sarah Assmann
Biology Department
Penn State University
University Park
PA
16802
USA