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

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Relation http://oar.icrisat.org/12741/
https://elifesciences.org/articles/86169
https://doi.org/10.7554/eLife.86169.3
 
Title Glutaredoxin regulation of primary root growth is associated with early drought stress tolerance in pearl millet
 
Creator Fuente, C de la
Grondin, A
Sine, B
Debieu, M
Belin, C
Hajjarpoor, A
Atkinson, J A
Passot, S
Salson, M
Orjuela, J
Tranchant-Dubreuil, C
Brossier, J
Steffen, M
Morgado, C
Dinh, H N
Pandey, B K
Darmau, J
Champion, A
Petitot, A
Barrachina, C
Pratlong, M
Mounier, T
Nakombo-Gbassault, P
Gantet, P
Gangashetty, P I
Guedon, Y
Vadez, V
Reichheld, J
Bennett, M J
Kane, N A
Guyomarc'H, S
Wells, D M
Vigouroux, Y
Laplaze, L
 
Subject Drought Tolerance
Pearl Millet
 
Description 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 modeling, 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 genome-wide association study and quantitative trait loci (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.
 
Publisher eLife Sciences Publications
 
Date 2024-01-31
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Rights cc_attribution
 
Identifier http://oar.icrisat.org/12741/1/elife_12_1-21_2024.pdf
Fuente, C de la and Grondin, A and Sine, B and Debieu, M and Belin, C and Hajjarpoor, A and Atkinson, J A and Passot, S and Salson, M and Orjuela, J and Tranchant-Dubreuil, C and Brossier, J and Steffen, M and Morgado, C and Dinh, H N and Pandey, B K and Darmau, J and Champion, A and Petitot, A and Barrachina, C and Pratlong, M and Mounier, T and Nakombo-Gbassault, P and Gantet, P and Gangashetty, P I and Guedon, Y and Vadez, V and Reichheld, J and Bennett, M J and Kane, N A and Guyomarc'H, S and Wells, D M and Vigouroux, Y and Laplaze, L (2024) Glutaredoxin regulation of primary root growth is associated with early drought stress tolerance in pearl millet. eLife, 12. pp. 1-21. ISSN 2050-084X