Marker-assisted introgression of the salinity tolerance locus Saltol in temperate Japonica rice

Maré Caterina, Zampieri Elisa, Cavallaro Viviana, Frouin Julien, Grenier Cécile, Courtois Brigitte, Brottier Laurent, Tacconi Gianni, Finocchiaro Franca, Serrat Xavier, Nogués Salvador, Bundó Mireia, San Segundo Blanca, Negrini Noemi, Pesenti Michele, Sacchi Gian Attilio, Gavina Giacomo, Bovina Riccardo, Monaco Stefano, Tondelli Alessandro, Cattivelli Luigi, Valè Giampiero. 2023. Marker-assisted introgression of the salinity tolerance locus Saltol in temperate Japonica rice. Rice, 16:2, 18 p.

https://doi.org/10.1186/s12284-023-00619-2

Article de revue ; Article de recherche ; Article de revue à facteur d'impact

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Résumé : Background: Rice is one of the most salt sensitive crops at seedling, early vegetative and reproductive stages. Varieties with salinity tolerance at seedling stage promote an efficient growth at early stages in salt affected soils, leading to healthy vegetative growth that protects crop yield. Saltol major QTL confers capacity to young rice plants growing under salt condition by maintaining a low Na+/K+ molar ratio in the shoots. Results: Marker-assisted backcross (MABC) procedure was adopted to transfer Saltol locus conferring salt tolerance at seedling stage from donor indica IR64-Saltol to two temperate japonica varieties, Vialone Nano and Onice. Forward and background selections were accomplished using polymorphic KASP markers and a final evaluation of genetic background recovery of the selected lines was conducted using 15,580 SNP markers obtained from Genotyping by Sequencing. Three MABC generations followed by two selfing, allowed the identification of introgression lines achieving a recovery of the recurrent parent (RP) genome up to 100% (based on KASP markers) or 98.97% (based on GBS). Lines with highest RP genome recovery (RPGR) were evaluated for agronomical-phenological traits in field under non-salinized conditions. VN1, VN4, O1 lines were selected considering the agronomic evaluations and the RPGR% results as the most interesting for commercial exploitation. A physiological characterization was conducted by evaluating salt tolerance under hydroponic conditions. The selected lines showed lower standard evaluation system (SES) scores: 62% of VN4, and 57% of O1 plants reaching SES 3 or SES 5 respectively, while only 40% of Vialone Nano and 25% of Onice plants recorded scores from 3 to 5, respectively. VN1, VN4 and O1 showed a reduced electrolyte leakage values, and limited negative effects on relative water content and shoot/root fresh weight ratio. Conclusion: The Saltol locus was successfully transferred to two elite varieties by MABC in a time frame of three years. The application of background selection until BC3F3 allowed the selection of lines with a RPGR up to 98.97%. Physiological evaluations for the selected lines indicate an improved salinity tolerance at seedling stage. The results supported the effectiveness of the Saltol locus in temperate japonica and of the MABC procedure for recovering of the RP favorable traits.

Mots-clés Agrovoc : Oryza sativa, tolérance au sel, marqueur génétique, polymorphisme génétique, rendement des cultures, sélection récurrente, variété, stress osmotique, Introgression, sélection, variation génétique, génotype

Mots-clés libres : Rice, Breeding, Salt tolerance, MABC

Classification Agris : F30 - Génétique et amélioration des plantes
F60 - Physiologie et biochimie végétale
H50 - Troubles divers des plantes

Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques

Agences de financement européennes : European Commission

Programme de financement européen : H2020

Projets sur financement : (EU) New commercial EUropean RICE (Oryza sativa) harbouring salt tolerance alleles to protect the rice sector against climate change and apple snail (Pomacea insularum) invasion

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