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Abstract
The rhizosheath, the layer of soil that adheres strongly to roots, influences water and nutrients acquisition. Pearl millet is a cereal crop that plays a major role for food security in arid regions of sub-Saharan Africa and India. We previously showed that root-adhering soil mass is a heritable trait in pearl millet and that it correlates with changes in rhizosphere microbiota structure and functions. Here, we studied the correlation between root-adhering soil mass and root hair development, root architecture, and symbiosis with arbuscular mycorrhizal fungi and we analysed the genetic control of this trait using genome wide association (GWAS) combined with bulk segregant analysis and gene expression studies. Root-adhering soil mass was weakly correlated only to root hairs traits in pearl millet. Twelve QTLs for rhizosheath formation were identified by GWAS. Bulk segregant analysis on a biparental population validated five of these QTLs. Combining genetics with a comparison of global gene expression in the root tip of contrasted inbred lines revealed candidate genes that might control rhizosheath formation in pearl millet. Our study indicates that rhizosheath formation is under complex genetic control in pearl millet and suggests that it is mainly regulated by root exudation.
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Details
1 Université de Montpellier, IRD, CIRAD, DIADE, Montpellier, France (GRID:grid.121334.6) (ISNI:0000 0001 2097 0141)
2 Eco&Sols, Université de Montpellier, IRD, CIRAD, INRAE, Institut Agro, Montpellier, France (GRID:grid.503166.7); Laboratoire Mixte International Intensification Écologique Des Sols Cultivés en Afrique de L’Ouest (IESOL), Dakar, Senegal (GRID:grid.503166.7); Université Cheikh Anta Diop, Département de Biologie Végétale, Faculté Des Sciences Et Techniques, Dakar, Sénégal (GRID:grid.8191.1) (ISNI:0000 0001 2186 9619)
3 Eco&Sols, Université de Montpellier, IRD, CIRAD, INRAE, Institut Agro, Montpellier, France (GRID:grid.503166.7); Laboratoire Mixte International Intensification Écologique Des Sols Cultivés en Afrique de L’Ouest (IESOL), Dakar, Senegal (GRID:grid.503166.7)
4 Université de Montpellier, IRD, CIRAD, DIADE, Montpellier, France (GRID:grid.121334.6) (ISNI:0000 0001 2097 0141); Laboratoire Mixte International Adaptation Des Plantes Et Microorganismes Associés Aux Stress Environnementaux (LAPSE), Dakar, Senegal (GRID:grid.511280.f); CERAAS, Thiès, Senegal (GRID:grid.463156.3) (ISNI:0000 0004 1791 3754)
5 Montpellier GenomiX, Montpellier, France (GRID:grid.509520.b)
6 Laboratoire Mixte International Adaptation Des Plantes Et Microorganismes Associés Aux Stress Environnementaux (LAPSE), Dakar, Senegal (GRID:grid.511280.f)
7 Laboratoire Mixte International Adaptation Des Plantes Et Microorganismes Associés Aux Stress Environnementaux (LAPSE), Dakar, Senegal (GRID:grid.511280.f); Université Cheikh Anta Diop, Département de Biologie Végétale, Faculté Des Sciences Et Techniques, Dakar, Sénégal (GRID:grid.8191.1) (ISNI:0000 0001 2186 9619)
8 Aix Marseille Univ, CEA, CNRS, BIAM, LEMiRE, Laboratory of Microbial Ecology of the Rhizosphere, ECCOREV FR 3098, Saint Paul-Lez-Durance, France (GRID:grid.5399.6) (ISNI:0000 0001 2176 4817)
9 Eco&Sols, Université de Montpellier, IRD, CIRAD, INRAE, Institut Agro, Montpellier, France (GRID:grid.503166.7)
10 Université de Montpellier, IRD, CIRAD, DIADE, Montpellier, France (GRID:grid.121334.6) (ISNI:0000 0001 2097 0141); Laboratoire Mixte International Adaptation Des Plantes Et Microorganismes Associés Aux Stress Environnementaux (LAPSE), Dakar, Senegal (GRID:grid.511280.f)