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Cytokinin signalling inhibitory fields provide robustness to phyllotaxis

Besnard Fabrice, Refahi Yassin, Morin Valérie, Marteaux Benjamin, Brunoud Géraldine, Chambrier Pierre, Rozier Frédérique, Mirabet Vincent, Legrand Jonathan, Lainé Stéphanie, Thévenon Emmanuel, Farcot Etienne, Cellier Coralie, Das Pradeep, Bishopp Anthony, Dumas Renaud, Parcy François, Helariutta Ykä, Boudaoud Arezki, Godin Christophe, Traas Jan, Guédon Yann, Vernoux Teva. 2014. Cytokinin signalling inhibitory fields provide robustness to phyllotaxis. Nature, 505n.7483 : 417-421.

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Quartile : Outlier, Sujet : MULTIDISCIPLINARY SCIENCES

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Economie-gestion; Psychologie-éthologie-ergonomie

Résumé : How biological systems generate reproducible patterns with high precision is a central question in science1. The shoot apical meristem (SAM), a specialized tissue producing plant aerial organs, is a developmental system of choice to address this question. Organs are periodically initiated at the SAM at specific spatial positions and this spatiotemporal pattern defines phyllotaxis. Accumulation of the plant hormone auxin triggers organ initiation2, 3, 4, 5, whereas auxin depletion around organs generates inhibitory fields that are thought to be sufficient to maintain these patterns and their dynamics4, 6, 7, 8, 9, 10, 11, 12, 13. Here we show that another type of hormone-based inhibitory fields, generated directly downstream of auxin by intercellular movement of the cytokinin signalling inhibitor ARABIDOPSIS HISTIDINE PHOSPHOTRANSFER PROTEIN 6 (AHP6)14, is involved in regulating phyllotactic patterns. We demonstrate that AHP6-based fields establish patterns of cytokinin signalling in the meristem that contribute to the robustness of phyllotaxis by imposing a temporal sequence on organ initiation. Our findings indicate that not one but two distinct hormone-based fields may be required for achieving temporal precision during formation of reiterative structures at the SAM, thus indicating an original mechanism for providing robustness to a dynamic developmental system.

Classification Agris : F60 - Physiologie et biochimie végétale
F62 - Physiologie végétale - Croissance et développement

Champ stratégique Cirad : Axe 1 (2014-2018) - Agriculture écologiquement intensive

Auteurs et affiliations

  • Besnard Fabrice, UCLB (FRA)
  • Refahi Yassin, INRIA (FRA)
  • Morin Valérie, ENS Lyon (FRA)
  • Marteaux Benjamin, ENS Lyon (FRA)
  • Brunoud Géraldine, ENS Lyon (FRA)
  • Chambrier Pierre, ENS Lyon (FRA)
  • Rozier Frédérique, ENS Lyon (FRA)
  • Mirabet Vincent, ENS Lyon (FRA)
  • Legrand Jonathan, INRIA (FRA)
  • Lainé Stéphanie, ENS Lyon (FRA)
  • Thévenon Emmanuel, CEA (FRA)
  • Farcot Etienne, INRIA (FRA)
  • Cellier Coralie, ENS Lyon (FRA)
  • Das Pradeep, ENS Lyon (FRA)
  • Bishopp Anthony, University of Helsinki (FIN)
  • Dumas Renaud, CEA (FRA)
  • Parcy François, CEA (FRA)
  • Helariutta Ykä, University of Helsinki (FIN)
  • Boudaoud Arezki, ENS Lyon (FRA)
  • Godin Christophe, INRIA (FRA)
  • Traas Jan, ENS Lyon (FRA)
  • Guédon Yann, CIRAD-BIOS-UMR AGAP (FRA)
  • Vernoux Teva, ENS Lyon (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/572009/)

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