Ndour P.M.S., Achouak W., Heulin T., Laplaze Laurent, Cournac Laurent. (2022). Using root-soil interactions in the rhizosphere as valuable traits for selection against drought. In :
Kane N.A. (ed.), Foncéka D. (ed.), Dalton T.J. (ed.). Crop adaptation and improvement for drought-prone environments. Manhattan : New Prairie Press, 283-304. ISBN 978-1-944548-47-6.
Titre du document
Using root-soil interactions in the rhizosphere as valuable traits for selection against drought
Année de publication
2022
Type de document
Partie d'ouvrage
Auteurs
Ndour P.M.S., Achouak W., Heulin T., Laplaze Laurent, Cournac Laurent
In
Kane N.A. (ed.), Foncéka D. (ed.), Dalton T.J. (ed.), Crop adaptation and improvement for drought-prone environments
Source
Manhattan : New Prairie Press, 2022,
283-304 ISBN 978-1-944548-47-6
The rhizosphere, meaning the soil volume influenced by the living roots, hosts several important ecological processes implicating the soil, the root system and active microbiota. These various interactions often impact soil carbon (C) content and nutrient dynamics, as well as soil water retention, by modifying its biological and physico-chemical properties. Well-known root adaptive traits for drought tolerance include deep rooting and increased root development, both of which ensure better exploration of the soil volume required for greater water uptake. However, the intensity of root-soil-microbiota interactions shape the size of the rhizosheath (i.e., the soil mass that remains attached to roots after plant excavation), which could modulate the water retention capacity of soil. Indeed, genotypes with larger rhizosheath respond better to drought stress than those with a smaller rhizosheath in several plant species. From a breeding perspective, intra-specific variation in rhizosheath size has recently been demonstrated in two important crops in West Africa: pearl millet and maize. Therefore, genotypes with large rhizosheath could be considered for varietal selection for adaptation to drought. Ongoing genome wide association studies (GWAS) should confirm genetic control of rhizosheath size and map candidate genes and investigations should be performed on the mechanisms that support this genetically complex trait.
Plan de classement
Interaction plante-sol [076AGRO10]
;
Ecologie végétale [076BOTA05]
;
Mécanismes physiologique et biochimiques des plantes [076PHYBIO]
