Calcium signals are necessary to establish auxin transporter polarity in a plant stem cell niche

Ting Li, An Yan, Neha Bhatia, Alphan Altinok, Eldad Afik, Pauline Durand-Smet, Paul T. Tarr, Julian I. Schroeder, Marcus G. Heisler () and Elliot M. Meyerowitz ()
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Ting Li: California Institute of Technology
An Yan: California Institute of Technology
Neha Bhatia: The University of Sydney
Alphan Altinok: California Institute of Technology
Eldad Afik: California Institute of Technology
Pauline Durand-Smet: California Institute of Technology
Paul T. Tarr: California Institute of Technology
Julian I. Schroeder: University of California, San Diego
Marcus G. Heisler: The University of Sydney
Elliot M. Meyerowitz: California Institute of Technology

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract In plants mechanical signals pattern morphogenesis through the polar transport of the hormone auxin and through regulation of interphase microtubule (MT) orientation. To date, the mechanisms by which such signals induce changes in cell polarity remain unknown. Through a combination of time-lapse imaging, and chemical and mechanical perturbations, we show that mechanical stimulation of the SAM causes transient changes in cytoplasmic calcium ion concentration (Ca2+) and that transient Ca2+ response is required for downstream changes in PIN-FORMED 1 (PIN1) polarity. We also find that dynamic changes in Ca2+ occur during development of the SAM and this Ca2+ response is required for changes in PIN1 polarity, though not sufficient. In contrast, we find that Ca2+ is not necessary for the response of MTs to mechanical perturbations revealing that Ca2+ specifically acts downstream of mechanics to regulate PIN1 polarity response.

Date: 2019
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DOI: 10.1038/s41467-019-08575-6

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