Spatial specificity of auxin responses coordinates wood formation

Klaus Brackmann, Jiyan Qi, Michael Gebert, Virginie Jouannet, Theresa Schlamp, Karin Grünwald, Eva-Sophie Wallner, Daria D. Novikova, Victor G. Levitsky, Javier Agustí, Pablo Sanchez, Jan U. Lohmann and Thomas Greb ()
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Klaus Brackmann: Vienna Biocenter (VBC)
Jiyan Qi: Heidelberg University
Michael Gebert: Heidelberg University
Virginie Jouannet: Heidelberg University
Theresa Schlamp: Heidelberg University
Karin Grünwald: Vienna Biocenter (VBC)
Eva-Sophie Wallner: Heidelberg University
Daria D. Novikova: Novosibirsk State University
Victor G. Levitsky: Novosibirsk State University
Javier Agustí: Vienna Biocenter (VBC)
Pablo Sanchez: Vienna Biocenter (VBC)
Jan U. Lohmann: Heidelberg University
Thomas Greb: Heidelberg University

Nature Communications, 2018, vol. 9, issue 1, 1-15

Abstract: Abstract Spatial organization of signalling events of the phytohormone auxin is fundamental for maintaining a dynamic transition from plant stem cells to differentiated descendants. The cambium, the stem cell niche mediating wood formation, fundamentally depends on auxin signalling but its exact role and spatial organization is obscure. Here we show that, while auxin signalling levels increase in differentiating cambium descendants, a moderate level of signalling in cambial stem cells is essential for cambium activity. We identify the auxin-dependent transcription factor ARF5/MONOPTEROS to cell-autonomously restrict the number of stem cells by directly attenuating the activity of the stem cell-promoting WOX4 gene. In contrast, ARF3 and ARF4 function as cambium activators in a redundant fashion from outside of WOX4-expressing cells. Our results reveal an influence of auxin signalling on distinct cambium features by specific signalling components and allow the conceptual integration of plant stem cell systems with distinct anatomies.

Date: 2018
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-03256-2

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DOI: 10.1038/s41467-018-03256-2

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