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Author Response: Glutaredoxin regulation of primary root growth is associated with early drought stress tolerance in pearl millet

de la Fuente, Carla; Grondin, Alexandre; Sine, Bassirou; Debieu, Marilyne; Belin, Christophe; Hajjarpoor, Amir; Atkinson, Jonathan A.; Passot, Sixtine; Salson, Marine; Orjuela, Julie; Tranchant-Dubreuil, Christine; Brossier, Jean-Rémy; Steffen, Maxime; Morgado, Charlotte; Dinh, Hang Ngan; Pandey, Bipin K.; Darmau, Julie; Champion, Antony; Petitot, Anne-Sophie; Barrachina, Celia; Pratlong, Marine; Mounier, Thibault; Nakombo-Gbassault, Princia; Gantet, Pascal; Gangashetty, Prakash; Guédon, Yann; Vadez, Vincent; Reichheld, Jean-Philippe; Bennett, Malcolm J.; Kane, Ndjido; Guyomarc’h, Soazig; Wells, Darren M.; Vigouroux, Yves; Laplaze, Laurent

Author Response: Glutaredoxin regulation of primary root growth is associated with early drought stress tolerance in pearl millet Thumbnail


Authors

Carla de la Fuente

Alexandre Grondin

Bassirou Sine

Marilyne Debieu

Christophe Belin

Amir Hajjarpoor

Sixtine Passot

Marine Salson

Julie Orjuela

Christine Tranchant-Dubreuil

Jean-Rémy Brossier

Maxime Steffen

Charlotte Morgado

Hang Ngan Dinh

Julie Darmau

Antony Champion

Anne-Sophie Petitot

Celia Barrachina

Marine Pratlong

Thibault Mounier

Princia Nakombo-Gbassault

Pascal Gantet

Prakash Gangashetty

Yann Guédon

Vincent Vadez

Jean-Philippe Reichheld

Ndjido Kane

Soazig Guyomarc’h

DARREN WELLS DARREN.WELLS@NOTTINGHAM.AC.UK
Principal Research Fellow

Yves Vigouroux

Laurent Laplaze



Abstract

Seedling root traits impact plant establishment under challenging environments. Pearl millet is one of the most heat and drought tolerant cereal crops that provides a vital food source across the sub-Saharan Sahel region. Pearl millet’s early root system features a single fast-growing primary root which we hypothesize is an adaptation to the Sahelian climate. Using crop modelling, we demonstrate that early drought stress is an important constraint in agrosystems in the Sahel where pearl millet was domesticated. Furthermore, we show that increased pearl millet primary root growth is correlated with increased early water stress tolerance in field conditions. Genetics including GWAS and QTL approaches identify genomic regions controlling this key root trait. Combining gene expression data, re-sequencing and re-annotation of one of these genomic regions identified a glutaredoxin-encoding gene PgGRXC9 as the candidate stress resilience root growth regulator. Functional characterization of its closest Arabidopsis homolog AtROXY19 revealed a novel role for this glutaredoxin (GRX) gene clade in regulating cell elongation. In summary, our study suggests a conserved function for GRX genes in conferring root cell elongation and enhancing resilience of pearl millet to its Sahelian environment.

Citation

de la Fuente, C., Grondin, A., Sine, B., Debieu, M., Belin, C., Hajjarpoor, A., …Laplaze, L. Author Response: Glutaredoxin regulation of primary root growth is associated with early drought stress tolerance in pearl millet

Working Paper Type Working Paper
Deposit Date Feb 24, 2024
Publicly Available Date Feb 26, 2024
Public URL https://nottingham-repository.worktribe.com/output/29841991
Publisher URL https://elifesciences.org/reviewed-preprints/86169v2/reviews

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