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Communication Dans Un Congrès Année : 2022

De novo stem cell establishment in meristems requires repression of organ boundary cell fate

Antoine Nicolas
Aude Maugarny-Calès
Bernard Adroher
Liudmila Chelysheva
Jasmine Burguet
Anne-Maarit Bågman
Siobhan M Brady
  • Fonction : Auteur
  • PersonId : 909707
Yunhai Li
Patrick Laufs

Résumé

Meristems are the ultimate source of all plant organs and tissues, whether roots, stems, leaves or flowers. These multicellular structures are either formed during embryogenesis or arise throughout the life of the plant. In particular, axillary meristems that produce lateral shoots arise from the division of boundary domain cells at the leaf base. The CUP-SHAPED COTYLEDON (CUC) genes are major determinants of the boundary domain and are required for axillary meristem initiation. However, how axillary meristems get structured and how stem cells become established de novo remain elusive. Here, we show that two NGATHA-LIKE transcription factors, DPA4 and SOD7, redundantly repress CUC expression in initiating axillary meristems of Arabidopsis thaliana. Ectopic boundary fate leads to abnormal growth and organisation of the axillary meristem and prevents de novo stem cell establishment. Floral meristems of the dpa4 sod7 double mutant show a similar delay in de novo stem cell establishment. Although the shoot apical meristems shares with axillary meristem a phase of CUC gene repression during the early stages of their formation, we found that stem cell specification is not affectd in dpa4 sod7 double mutant. Altogether, our work reveals a pathway facilitating stem cell formation in post-embryonic formed meristems and stresses the difference in the regulatory networks leading to meristem formation during the embryonic and post-embryonic phases.
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Dates et versions

hal-04122164 , version 1 (08-06-2023)

Identifiants

  • HAL Id : hal-04122164 , version 1

Citer

Antoine Nicolas, Aude Maugarny-Calès, Bernard Adroher, Liudmila Chelysheva, Yu Li, et al.. De novo stem cell establishment in meristems requires repression of organ boundary cell fate. From genes to plant architecture: the shoot apical meristem in all ist states, Nov 2022, Poitiers, France. ⟨hal-04122164⟩
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