Interaction between Meristem Tissue Layers Controls Phyllotaxis

Kierzkowski, Daniel; Lenhard, Michael; Smith, Richard; Kuhlemeier, Cris (2013). Interaction between Meristem Tissue Layers Controls Phyllotaxis. Developmental cell, 26(6), pp. 616-628. Cell Press 10.1016/j.devcel.2013.08.017

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Phyllotaxis and vein formation are among the most conspicuous patterning processes in plants. The expression and polarization of the auxin efflux carrier PIN1 is the earliest marker for both processes, with mathematical models indicating that PIN1 can respond to auxin gradients and/or auxin flux. Here, we use cell-layer-specific PIN1 knockouts and partial complementation of auxin transport mutants to examine the interaction between phyllotactic patterning, which occurs primarily in the L1 surface layer of the meristem, and midvein specification in the inner tissues. We show that PIN1 expression in the L1 is sufficient for correct organ positioning, as long as the L1-specific influx carriers are present. Thus, differentiation of inner tissues can proceed without PIN1 or any of the known polar transporters. On theoretical grounds, we suggest that canalization of auxin flux between an auxin source and an auxin sink may involve facilitated diffusion rather than polar transport.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Plant Development
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)

UniBE Contributor:

Kierzkowski, Daniel; Smith, Richard Simon and Kuhlemeier, Cris

Subjects:

500 Science > 580 Plants (Botany)

ISSN:

1534-5807

Publisher:

Cell Press

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

17 Feb 2014 17:19

Last Modified:

08 Sep 2015 12:06

Publisher DOI:

10.1016/j.devcel.2013.08.017

PubMed ID:

24091013

BORIS DOI:

10.7892/boris.40917

URI:

https://boris.unibe.ch/id/eprint/40917

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