Auxin depletion from leaf primordia contributes to organ patterning - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Journal Articles Proceedings of the National Academy of Sciences of the United States of America Year : 2014

Auxin depletion from leaf primordia contributes to organ patterning

Abstract

Stem cells are responsible for organogenesis, but it is largely unknown whether and how information from stem cells acts to direct organ patterning after organ primordia are formed. It has long been proposed that the stem cells at the plant shoot apex produce a signal, which promotes leaf adaxial-abaxial (dorsoventral) patterning. Here we show the existence of a transient low auxin zone in the adaxial domain of early leaf primordia. We also demonstrate that this adaxial low auxin domain contributes to leaf adaxial-abaxial patterning. The auxin signal is mediated by the auxin-responsive transcription factor MONOPTEROS (MP), whose constitutive activation in the adaxial domain promotes abaxial cell fate. Furthermore, we show that auxin flow from emerging leaf primordia to the shoot apical meristem establishes the low auxin zone, and that this auxin flow contributes to leaf polarity. Our results provide an explanation for the hypothetical meristem-derived leaf polarity signal. Opposite to the original proposal, instead of a signal derived from the meristem, we show that a signaling molecule is departing from the primordium to the meristem to promote robustness in leaf patterning.

Dates and versions

hal-02639954 , version 1 (28-05-2020)

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Jiyan Qi, Ying Wang, Ting Yu, Alexandre Cunha, Binbin Wu, et al.. Auxin depletion from leaf primordia contributes to organ patterning. Proceedings of the National Academy of Sciences of the United States of America, 2014, 111 (52), pp.18769 - 18774. ⟨10.1073/pnas.1421878112⟩. ⟨hal-02639954⟩
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