Robust organ size requires robust timing of initiation orchestrated by focused auxin and cytokinin signalling - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement
Article Dans Une Revue Nature Plants Année : 2020

Robust organ size requires robust timing of initiation orchestrated by focused auxin and cytokinin signalling

Mingyuan Zhu
  • Fonction : Auteur
Weiwei Chen
  • Fonction : Auteur
Lilan Hong
  • Fonction : Auteur
Simone Bovio
Soeren Strauss
  • Fonction : Auteur
Erich Schwarz
  • Fonction : Auteur
Satoru Tsugawa
  • Fonction : Auteur
Zhou Wang
  • Fonction : Auteur
Richard Smith
Chun-Biu Li
  • Fonction : Auteur
Olivier Hamant
Adrienne Roeder
  • Fonction : Auteur

Résumé

The shape of plant organs shows low variability. Sepals of the same age look the same. Here the authors identify one transcription factor (DRMY1) crucial for sepal size reproducibility, and its effect on initiation timing and growth of the organ.Organ size and shape are precisely regulated to ensure proper function. The four sepals in each Arabidopsis thaliana flower must maintain the same size throughout their growth to continuously enclose and protect the developing bud. Here we show that DEVELOPMENT RELATED MYB-LIKE 1 (DRMY1) is required for both timing of organ initiation and proper growth, leading to robust sepal size in Arabidopsis. Within each drmy1 flower, the initiation of some sepals is variably delayed. Late-initiating sepals in drmy1 mutants remain smaller throughout development, resulting in variability in sepal size. DRMY1 focuses the spatiotemporal signalling patterns of the plant hormones auxin and cytokinin, which jointly control the timing of sepal initiation. Our findings demonstrate that timing of organ initiation, together with growth and maturation, contribute to robust organ size.
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Dates et versions

hal-03153115 , version 1 (20-01-2024)

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Mingyuan Zhu, Weiwei Chen, Vincent Mirabet, Lilan Hong, Simone Bovio, et al.. Robust organ size requires robust timing of initiation orchestrated by focused auxin and cytokinin signalling. Nature Plants, 2020, 6 (6), pp.686-698. ⟨10.1038/s41477-020-0666-7⟩. ⟨hal-03153115⟩
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