Regulation of planar growth by the Arabidopsis AGC protein kinase UNICORN - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Accéder directement au contenu
Article Dans Une Revue Proceedings of the National Academy of Sciences of the United States of America Année : 2012

Regulation of planar growth by the Arabidopsis AGC protein kinase UNICORN

Balaji Enugutti
  • Fonction : Auteur
Maxi Oelschner
  • Fonction : Auteur
Ramón Angel Torres Ruiz
  • Fonction : Auteur
Ivo Schliebner
  • Fonction : Auteur
Kay Schneitz
  • Fonction : Auteur

Résumé

The spatial coordination of growth is of central importance for the regulation of plant tissue architecture. Individual layers, such as the epidermis, are clonally propagated and structurally maintained by symmetric cell divisions that are oriented along the plane of the layer. The developmental control of this process is poorly understood. The simple cellular basis and sheet-like structure of Arabidopsis integuments make them an attractive model system to address planar growth. Here we report on the characterization of the Arabidopsis UNICORN ( UCN ) gene. Analysis of ucn integuments reveals localized distortion of planar growth, eventually resulting in an ectopic multicellular protrusion. In addition, ucn mutants exhibit ectopic growth in filaments and petals, as well as aberrant embryogenesis. We further show that UCN encodes an active AGC VIII kinase. Genetic, biochemical, and cell biological data suggest that UCN suppresses ectopic growth in integuments by directly repressing the KANADI transcription factor ABERRANT TESTA SHAPE. Our findings indicate that UCN represents a unique plant growth regulator that maintains planar growth of integuments by repressing a developmental regulator involved in the control of early integument growth and polarity.

Dates et versions

hal-03695916 , version 1 (15-06-2022)

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Citer

Balaji Enugutti, Charlotte Kirchhelle, Maxi Oelschner, Ramón Angel Torres Ruiz, Ivo Schliebner, et al.. Regulation of planar growth by the Arabidopsis AGC protein kinase UNICORN. Proceedings of the National Academy of Sciences of the United States of America, 2012, 109 (37), pp.15060-15065. ⟨10.1073/pnas.1205089109⟩. ⟨hal-03695916⟩

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