Horizon / Plein textes La base de ressources documentaires de l'IRD

IRD

Publications des scientifiques de l'IRD

Grondin Alexandre, Dixit S., Torres R., Venkateshwarlu C., Rogers E., Mitchell-Olds T., Benfey P. N., Kumar A., Henry A. (2018). Physiological mechanisms contributing to the QTL qDTY(3.2) effects on improved performance of rice Moroberekan x Swarna BC2F(3:4) lines under drought. Rice, 11, art. 43 [25 p.]. ISSN 1939-8425

Fichier PDF disponible http://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers18-09/010073704.pdf

Lien direct chez l'éditeur doi:10.1186/s12284-018-0234-1

Titre
Physiological mechanisms contributing to the QTL qDTY(3.2) effects on improved performance of rice Moroberekan x Swarna BC2F(3:4) lines under drought
Année de publication2018
Type de documentArticle référencé dans le Web of Science WOS:000440447500001
AuteursGrondin Alexandre, Dixit S., Torres R., Venkateshwarlu C., Rogers E., Mitchell-Olds T., Benfey P. N., Kumar A., Henry A.
SourceRice, 2018, 11, p. art. 43 [25 p.]. p. art. 43 [25 p.] ISSN 1939-8425
RésuméBackground: Traditional rice (Oryza sativa) varieties are valuable resources for the improvement of drought resistance. qDTY(3.2) is a drought-yield quantitative trait locus that was identified in a population derived from the traditional variety Moroberekan and the drought-susceptible variety Swarna. In this study, our aim was to characterize the physiological mechanisms associated with qDTY(3.2). Our approach was to phenotype fifteen BC2F3:4 lines for shoot and root drought resistance-related traits as compared to Swarna in the field under well-watered and drought stress conditions. Four BC2F3:4 lines contrasting for yield under drought were selected for detailed characterization of shoot morphology, water use related traits, flowering time and root system architecture in the field as well as in controlled environments (lysimeters in a greenhouse, and gel imaging platform in a growth chamber). Results: Across five field experiments, grain yield correlated significantly with root growth along the soil profile, flowering time, and canopy temperature under drought conditions. The four selected BC2F3:4 lines showed earlier flowering time, reduced distribution of root growth to shallow soil layers which resulted in lower water uptake (between 0 and 30 cm) and drought-induced increased distribution of root growth to deep soil layers (between 30 and 60 cm) as compared to Swarna in the field. Root system architecture phenotypes were confirmed in whole root systems in lysimeters, and corresponded to higher numbers of root tips in a gel imaging platform, highlighting the potential stability of some root traits across different growth stages and systems. Conclusions: We conclude that earlier flowering time, reduced shallow root growth, and drought-induced increased deep root growth are associated with the presence of qDTY(3.2) since these phenotypes were consistently observed in the selected QTL lines with full introgression of qDTY(3.2). We hypothesize that the qDTY(3.2) associated RSA phenotypes led to better use of water and metabolic resources which, combined with earlier flowering time, improved yield under drought.
Plan de classementSciences du monde végétal [076]
LocalisationFonds IRD [F B010073704]
Identifiant IRDfdi:010073704
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010073704

Export des données

Disponibilité des documents

Télechargment fichier PDF téléchargeable

Lien sur le Web lien chez l'éditeur

Accès réservé en accès réservé

HAL en libre accès sur HAL


Accès aux documents originaux :

Le FDI est labellisé CollEx

Accès direct

Bureau du chercheur

Site de la documentation

Espace intranet IST (accès réservé)

Suivi des publications IRD (accès réservé)

Mentions légales

Services Horizon

Poser une question

Consulter l'aide en ligne

Déposer une publication (accès réservé)

S'abonner au flux RSS

Voir les tableaux chronologiques et thématiques

Centres de documentation

Bondy

Montpellier (centre IRD)

Montpellier (MSE)

Nouméa

Papeete

Niamey

Ouagadougou

Tunis

La Paz

Quito