Cytokinin functions as an asymmetric and anti-gravitropic signal in lateral roots
| Autor: | Elizabeth Sarkel, Kai Dünser, Heike Lindner, Ondrej Novak, Michel Ruiz Rosquete, José R. Dinneny, Krzysztof Wabnik, Shanice Martopawiro, Sascha Waidmann, Therese LaRue, Rashmi Sasidharan, Jürgen Kleine-Vehn, Ivan Petřík, Maria Schöller |
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| Přispěvatelé: | Sub Plant Ecophysiology, Plant Ecophysiology |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
Cytokinins Chemistry(all) Cytokinin oxidase Science Biología Arabidopsis Root system Physics and Astronomy(all) Signal peptide processing 01 natural sciences Signal Plant Roots 03 medical and health sciences chemistry.chemical_compound Gravitropism Plant Growth Regulators Auxin Arabidopsis thaliana lcsh:Science 030304 developmental biology chemistry.chemical_classification 0303 health sciences biology Chemistry Arabidopsis Proteins Biochemistry Genetics and Molecular Biology(all) Systems Biology Lateral root fungi food and beverages biology.organism_classification Plants Genetically Modified Cytokinin Proteolysis Biophysics lcsh:Q Oxidoreductases Genome Plant 010606 plant biology & botany Genome-Wide Association Study |
| Zdroj: | Nature Communications, ISSN 2041-1723, 2019, Vol. 10 Archivo Digital UPM Universidad Politécnica de Madrid Nature Communications, Vol 10, Iss 1, Pp 1-14 (2019) |
| Popis: | Directional organ growth allows the plant root system to strategically cover its surroundings. Intercellular auxin transport is aligned with the gravity vector in the primary root tips, facilitating downward organ bending at the lower root flank. Here we show that cytokinin signaling functions as a lateral root specific anti-gravitropic component, promoting the radial distribution of the root system. We performed a genome-wide association study and revealed that signal peptide processing of Cytokinin Oxidase 2 (CKX2) affects its enzymatic activity and, thereby, determines the degradation of cytokinins in naturalArabidopsis thalianaaccessions. Cytokinin signaling interferes with growth at the upper lateral root flank and thereby prevents downward bending. Our interdisciplinary approach revealed that two phytohormonal cues at opposite organ flanks counterbalance each other’s negative impact on growth, suppressing organ growth towards gravity and allow for radial expansion of the root system. |
| Databáze: | OpenAIRE |
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