Data from: A spatio-temporal understanding of growth regulation during the salt-stress response in Arabidopsis

Plant environmental responses involve dynamic changes in growth and
signaling, yet little is understood as to how progress through these
events is regulated. Here, we explored the phenotypic and transcriptional
events involved in the acclimation of the Arabidopsis thaliana seedling
root to a rapid change in salinity. Using live-imaging analysis, we show
that growth is dynamically regulated with a period of quiescence followed
by recovery then homeostasis. Through the use of a new high-resolution
spatio-temporal transcriptional map, we identify the key hormone signaling
pathways that regulate specific transcriptional programs, predict their
spatial domain of action, and link the activity of these pathways to the
regulation of specific phases of growth. We use tissue-specific approaches
to suppress the abscisic acid (ABA) signaling pathway and demonstrate that
ABA likely acts in select tissue layers to regulate spatially localized
transcriptional programs and promote growth recovery. Finally, we show
that salt also regulates many tissue-specific and time point–specific
transcriptional responses that are expected to modify water transport,
Casparian strip formation, and protein translation. Together, our data
reveal a sophisticated assortment of regulatory programs acting together
to coordinate spatially patterned biological changes involved in the
immediate and long-term response to a stressful shift in environment.