Center for Infectious Disease and Vector Research

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CEPCEB Seminars BPSC 252

Jose Dinneney

Friday, June 7, 2013
Noon1 p.m.


Genomics Building , Genomics Auditorium RM 1102A
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José R. Dinneny
Department of Plant Biolog
Carnegie Institution for Sciencey

Title:"A spatiotemporal understanding of environmental response in plants"

Abstract: Upon germination, a seedling will need to perceive and respond appropriately to a complex assortment of environmental variables.  A large component of this response will involve changes in the growth and patterning of tissues.  While years of research on plants has led to tremendous insight into the core signaling pathways utilized during environmental response, we still have a poor understanding of the actual mechanisms responsible for perceiving most stimuli, the spatial scale at which response decisions are made and the mechanisms used to coordinate responses from the cell type to the whole plant level.  In the Dinneny lab, we have pioneered the use of tissue-specific methods to probe the mechanisms that control responses to high salinity and moisture.  Through the use of fluorescence activated cell sorting, we had previously profiled each of the core cell types of the root under standard or salt stress conditions.  Recently, we have extended this work by profiling each cell layer of the root at multiple time points during the response from the first phases associated with growth repression, to late phases involving growth recovery and transcriptional homeostasis.  We have developed methods to disrupt response to the stress hormone Abscisic Acid with tissue-specificity and have used this tool to identify the endodermis as a critical signaling center for regulating growth of the primary and lateral root. A new area of research in the lab is focused on understanding how roots interpret micro-scale heterogeneity in environmental stimuli.  We have discovered that plants are able to perceive and respond at the transcriptional and developmental level to differences in moisture content across the circumferential axis of the root.  We will present data showing that these responses are conserved across flowering plants and are important for controlling root system architecture.

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Institute for Integrative Genome Biology

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