The epidermis coordinates auxin-induced stem growth in response to shade
2016
Procko, Carl | Burko, Yogev | Jaillais, Yvon | Ljung, Karin | Long, Jeff A. | Chory, Joanne | The Salk Institute for Biological Studies | Reproduction et développement des plantes (RDP) ; École normale supérieure de Lyon (ENS de Lyon) ; Université de Lyon-Université de Lyon-Institut National de la Recherche Agronomique (INRA)-Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Centre National de la Recherche Scientifique (CNRS) | Department of Forest Genetics and Plant Physiology ; Swedish University of Agricultural Sciences = Sveriges lantbruksuniversitet (SLU) | Department of Molecular, Cell, and Developmental Biology ; University of California [Los Angeles] (UCLA) ; University of California (UC)-University of California (UC) | Salk Institute for Biological Studies ; Plant Molecular and Cellular Biology Laboratory | NIH-National Cancer Institute Cancer Center P30 014195, Chapman Foundation, Helmsley Charitable Trust, NSF DBI-0735191 DBI-1265383, National Institutes of Health (NIH) 1F32GM101876-01, NIH GM52413 GM94428, National Science Foundation (NSF) EAGER grant IOS-1045256, Swedish Research Council (VR),Marianne and Marcus Wallenberg Foundation, Swedish Governmental Agency for Innovation Systems (Vinnova)
International audience
Afficher plus [+] Moins [-]anglais. 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.
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