Dynamic development of white lupin rootlets along a cluster root

Le Thanh Tamara, Hufnagel Maciel Bárbara, Soriano Alexandre, Divol Fanchon, Brottier Laurent, Casset Célia, Péret Benjamin, Doumas Patrick, Marquès Laurence. 2021. Dynamic development of white lupin rootlets along a cluster root. Frontiers in Plant Science, 12:738172, 15 p.

https://doi.org/10.3389/fpls.2021.738172

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Quartile : Q1, Sujet : PLANT SCIENCES

Résumé : White lupin produces cluster roots in response to phosphorus deficiency. Along the cluster root, numerous short rootlets successively appear, creating a spatial and temporal gradient of developmental stages that constitutes a powerful biological model to study the dynamics of the structural and functional evolution of these organs. The present study proposes a fine histochemical, transcriptomic and functional analysis of the rootlet development from its emergence to its final length. Between these two stages, the tissue structures of the rootlets were observed, the course of transcript expressions for the genes differentially expressed was monitored and some physiological events linked to Pi nutrition were followed. A switch between (i) a growing phase, in which a normal apical meristem is present and (ii) a specialized phase for nutrition, in which the rootlet is completely differentiated, was highlighted. In the final stage of its determinate growth, the rootlet is an organ with a very active metabolism, especially for the solubilization and absorption of several nutrients. This work discusses how the transition between a growing to a determinate state in response to nutritional stresses is found in other species and underlines the fundamental dilemma of roots between soil exploration and soil exploitation.

Mots-clés Agrovoc : expression des gènes, système racinaire, Transcription génique, physiologie végétale, adaptation physiologique, physiologie de la nutrition, nutrition des plantes, racine

Mots-clés géographiques Agrovoc : France

Mots-clés libres : White lupin, Rootlet, Cluster root, Determinate growth, Mineral nutrition

Agences de financement européennes : European Research Council, European Commission

Programme de financement européen : H2020

Projets sur financement : (EU) Unravelling cluster root development in white lupin

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