Identifying developmental zones in maize lateral root cell length profiles using multiple change-point models

Moreno-Ortega Beatriz, Fort Guillaume, Muller Bertrand Lionel, Guédon Yann. 2017. Identifying developmental zones in maize lateral root cell length profiles using multiple change-point models. Frontiers in Plant Science, 8:1750, 19 p.

Quartile : Q1, Sujet : PLANT SCIENCES

Résumé : The identification of the limits between the cell division, elongation and mature zones in the root apex is still a matter of controversy when methods based on cellular features, molecular markers or kinematics are compared while methods based on cell length profiles have been comparatively underexplored. Segmentation models were developed to identify developmental zones within a root apex on the basis of epidermal cell length profiles. Heteroscedastic piecewise linear models were estimated for maize lateral roots of various lengths of both wild type and two mutants affected in auxin signaling (rtcs and rum-1). The outputs of these individual root analyses combined with morphological features (first root hair position and root diameter) were then globally analyzed using principal component analysis. Three zones corresponding to the division zone, the elongation zone and the mature zone were identified in most lateral roots while division zone and sometimes elongation zone were missing in arrested roots. Our results are consistent with an auxin-dependent coordination between cell flux, cell elongation and cell differentiation. The proposed segmentation models could extend our knowledge of developmental regulations in longitudinally organized plant organs such as roots, monocot leaves or internodes.

Mots-clés Agrovoc : rhizosphère, élongation cellulaire, marqueur génétique, racine, cinématique

Classification Agris : F62 - Physiologie végétale - Croissance et développement
U10 - Informatique, mathématiques et statistiques

Champ stratégique Cirad : Axe 1 (2014-2018) - Agriculture écologiquement intensive

Agences de financement européennes : European Commission

Programme de financement européen : FP7

Projets sur financement : (EU) Enhancing resource Uptake from Roots under stress in cereal crops

Auteurs et affiliations

• Moreno-Ortega Beatriz, INRA (FRA)
• Fort Guillaume, INRA (FRA)
• Muller Bertrand Lionel, INRA (FRA)
• Guédon Yann, CIRAD-BIOS-UMR AGAP (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/585926/)

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