A mutually inhibitory interaction between auxin and cytokinin specifies vascular pattern in roots

A. Bishopp, H. Help, S. El Showk, D. Weijers, B. Scheres, J. Friml, E. Benková, A. Mähönen, Y. Helariutta, Current Biology 21 (2011) 917–926.

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Abstract
Background: Whereas the majority of animals develop toward a predetermined body plan, plants show iterative growth and continually produce new organs and structures from actively dividing meristems. This raises an intriguing question: How are these newly developed organs patterned? In Arabidopsis embryos, radial symmetry is broken by the bisymmetric specification of the cotyledons in the apical domain. Subsequently, this bisymmetry is propagated to the root promeristem. Results: Here we present a mutually inhibitory feedback loop between auxin and cytokinin that sets distinct boundaries of hormonal output. Cytokinins promote the bisymmetric distribution of the PIN-FORMED (PIN) auxin efflux proteins, which channel auxin toward a central domain. High auxin promotes transcription of the cytokinin signaling inhibitor AHP6, which closes the interaction loop. This bisymmetric auxin response domain specifies the differentiation of protoxylem in a bisymmetric pattern. In embryonic roots, cytokinin is required to translate a bisymmetric auxin response in the cotyledons to a bisymmetric vascular pattern in the root promeristem. Conclusions: Our results present an interactive feedback loop between hormonal signaling and transport by which small biases in hormonal input are propagated into distinct signaling domains to specify the vascular pattern in the root meristem. It is an intriguing possibility that such a mechanism could transform radial patterns and allow continuous vascular connections between other newly emerging organs.
Publishing Year
Date Published
2011-06-07
Journal Title
Current Biology
Volume
21
Issue
11
Page
917 - 926
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Bishopp A, Help H, El Showk S, et al. A mutually inhibitory interaction between auxin and cytokinin specifies vascular pattern in roots. Current Biology. 2011;21(11):917-926. doi:10.1016/j.cub.2011.04.017
Bishopp, A., Help, H., El Showk, S., Weijers, D., Scheres, B., Friml, J., … Helariutta, Y. (2011). A mutually inhibitory interaction between auxin and cytokinin specifies vascular pattern in roots. Current Biology, 21(11), 917–926. https://doi.org/10.1016/j.cub.2011.04.017
Bishopp, Anthony, Hanna Help, Sedeer El Showk, Dolf Weijers, Ben Scheres, Jirí Friml, Eva Benková, Ari Mähönen, and Ykä Helariutta. “A Mutually Inhibitory Interaction between Auxin and Cytokinin Specifies Vascular Pattern in Roots.” Current Biology 21, no. 11 (2011): 917–26. https://doi.org/10.1016/j.cub.2011.04.017.
A. Bishopp et al., “A mutually inhibitory interaction between auxin and cytokinin specifies vascular pattern in roots,” Current Biology, vol. 21, no. 11, pp. 917–926, 2011.
Bishopp A, Help H, El Showk S, Weijers D, Scheres B, Friml J, Benková E, Mähönen A, Helariutta Y. 2011. A mutually inhibitory interaction between auxin and cytokinin specifies vascular pattern in roots. Current Biology. 21(11), 917–926.
Bishopp, Anthony, et al. “A Mutually Inhibitory Interaction between Auxin and Cytokinin Specifies Vascular Pattern in Roots.” Current Biology, vol. 21, no. 11, Cell Press, 2011, pp. 917–26, doi:10.1016/j.cub.2011.04.017.

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