Sensitivity to high salinity in tetraploid citrus seedlings increases with water availability and correlates with expression of candidate genes

Mouhaya Wafa, Allario Thierry, Brumos Javier, Andres Fernando, Froelicher Yann, Luro François, Talon Manuel, Ollitrault Patrick, Morillon Raphaël. 2010. Sensitivity to high salinity in tetraploid citrus seedlings increases with water availability and correlates with expression of candidate genes. Functional Plant Biology, 37 (7) : 674-685.

Résumé : We investigated tolerance to high salinity in well-irrigated diploid and tetraploid citrus. Comparisons were made between two diploids (2×) of trifoliate orange (Poncirus trifoliata (L.) Raf.) and willow leaf mandarin (Citrus deliciosa Ten), their respective doubled diploids (4×) and the allotetraploid (FLHORAG1) obtained from the protoplast fusion of trifoliate orange and Willow leaf mandarin. Salinity stress was applied by progressively increasing the concentration of NaCl from 50 mM to 400 mM for 8 weeks. Two-year-old plants were watered daily. Maximum quantum yield of PSII, and leaf and root chloride and sodium content were monitored. We previously reported that under moderate saline stress, citrus 4× genotypes were more tolerant that the 2×, but under these experimental conditions, 4× seedlings were certainly more sensitive to salt stress than 2×, as they accumulated more toxic ions and were more affected than 2×. Chloride accumulation in 4× leaves was greater and the maximum quantum yield of PSII was more reduced in 4× than in 2×. The expression of several candidate genes involved in signal transduction, sodium and chloride transport, osmotic adjustment, regulation of the stomata opening and detoxification processes were also investigated by quantitative real-time reverse transcription-PCR. A high correlation was observed between phenotype of sensitivity to stress and gene expression changes.

Mots-clés Agrovoc : Poncirus trifoliata, Citrus

Mots-clés géographiques Agrovoc : Corse, France

Mots-clés complémentaires : Citrus deliciosa

Classification Agris : F30 - Génétique et amélioration des plantes
F62 - Physiologie végétale - Croissance et développement
H50 - Troubles divers des plantes

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

• Mouhaya Wafa, IVIA (ESP)
• Allario Thierry, IVIA (ESP)
• Brumos Javier, IVIA (ESP)
• Andres Fernando, IVIA (ESP)
• Froelicher Yann, CIRAD-BIOS-UPR Multiplication végétative (FRA)
• Luro François, INRA (FRA)
• Talon Manuel, IVIA (ESP)
• Ollitrault Patrick, CIRAD-BIOS-UPR Multiplication végétative (ESP) ORCID: 0000-0002-9456-5517
• Morillon Raphaël, CIRAD-BIOS-UPR Multiplication végétative (ESP)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/556473/)

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