Auxin, stomatal patterning and development.

 

Auxin transport and activity regulate stomatal patterning and development

by Le J., Liu X.-G., Yang K.-Y., Chen X.-L., Zou J.-J., Wang H.-Z., Wang M., Vanneste S., Morita M., Tasaka M., Ding Z.-J., Friml J., Beeckman T., Sack F. (2014)

  • Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
  • Department of Botany, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z4

in Nature Communications 5, – doi:10.1038/ncomms4090 –

http://www.nature.com/articles/ncomms4090

Abstract

Stomata are two-celled valves that control epidermal pores whose spacing optimizes shoot-atmosphere gas exchange. They develop from protodermal cells after unequal divisions followed by an equal division and differentiation.

The concentration of the hormone auxin, a master plant developmental regulator, is tightly controlled in time and space, but its role, if any, in stomatal formation is obscure.

Here dynamic changes of auxin activity during stomatal development are monitored using auxin input (DII-VENUS) and output (DR5:VENUS) markers by time-lapse imaging.

A decrease in auxin levels in the smaller daughter cell after unequal division presages the acquisition of a guard mother cell fate whose equal division produces the two guard cells.

Thus, stomatal patterning requires auxin pathway control of stem cell compartment size, as well as auxin depletion that triggers a developmental switch from unequal to equal division.

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Published by

Willem Van Cotthem

Honorary Professor of Botany, University of Ghent (Belgium). Scientific Consultant for Desertification and Sustainable Development.

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