Computational and Experimental Evidence That Auxin Accumulation in Nodule and Lateral Root Primordia Occurs by Different Mechanisms

Eva E. Deinum*, René Geurts, Marijke Hartog, Ton Bisseling, Bela M. Mulder

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapterAcademicpeer-review

3 Citations (Scopus)

Abstract

The formation of root lateral organ formation typically requires the de novo generation of a primordium, initiated at the site of local auxin accumulation. Legume roots are a particularly interesting example in this respect, as they can give rise to both lateral roots and root nodules. The initiation of the latter primordium is much less understood. Using computer simulations we start with an unbiased comparison of different mechanisms that a priori seemed capable of producing local auxin accumulation. These mechanisms all produce different characteristic signatures, of which a reduction of auxin efflux best matches the morphology of nodule primordia. This leads to the prediction that root nodule positions would not be affected by root curvature - contrary to lateral root primordia that are initiated by increased influx - which we experimentally confirmed. We further investigate how changes in the in silico root segment affect the induction and shape of local auxin maxima and discuss the functional implications of these findings with respect to nodule type and bounding the developmental zone where nodulation takes place.

Original languageEnglish
Title of host publicationBiological Nitrogen Fixation
EditorsFrans J. de Bruijn
PublisherWiley-Blackwell
Pages659-668
Number of pages10
Volume2
EditionFirst Edition
ISBN (Electronic)9781119053095
ISBN (Print)9781118637043
DOIs
Publication statusPublished - 1 Jan 2015

Keywords

  • Auxin
  • Computer simulation
  • Nodule primordium
  • PIN efflux carriers

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