Year: 2016
Type: preprint
Abstract: Growth of a complex multicellular organism requires coordinated changes in diverse cell types. These cellular changes generate organs of the correct size, shape, and functionality. In plants, the growth hormone auxin induces stem elongation in response to shade; however, which cell types of the stem perceive the auxin signal and contribute to organ growth is poorly understood. Here, we blocked the transcriptional response to auxin within specific tissues to show that auxin signaling is required in many cell types for correct hypocotyl growth in shade, with a key role for the epidermis. Combining genetic manipulations in Arabidopsis thaliana with transcriptional profiling of the hypocotyl epidermis from Brassica rapa, we show that auxin acts in the epidermis in part by inducing activity of the locally acting, growth-promoting brassinosteroid pathway. Our findings clarify cell-specific auxin function in the hypocotyl and highlight the complexity of cell type interactions within a growing organ.
Source: Genes & Development
Language: English
Subfield: Plant Science
Domain: Life Sciences
Open Access status: hybrid
Funders: National Science Foundation, U.S. Department of Energy, Leona M. and Harry B. Helmsley Charitable Trust, Joint Genome Institute, VINNOVA, Vetenskapsrådet, Forskningsrådet om Hälsa, Arbetsliv och Välfärd, Marcus och Amalia Wallenbergs minnesfond, National Institutes of Health, National Cancer Institute, National Institute of General Medical Sciences, H2020 European Research Council
Awards: The iPlant Collaborative: Cyberinfrastructure for the Life Sciences, Molecular Mechanisms of Steroid Hormone Perception at the Cell Surface, Quantifying Small Molecules in Cells of Live Organisms, Initial Events in Photoreceptor Signaling, G4066625888, Cell-specific analysis of plant shade avoidance responses, G4801963049, PSCIC Full Proposal: The iPlant Collaborative: A Cyberinfrastructure-Centered Community for a New Plant Biology
OpenAlex ID: W2472431700