Effects of the acclimation to high salinity on intestinal ion and peptide transporters in two tilapia species that differ in their salinity tolerance

Chourasia Tapan Kumar, D'Cotta Helena, Baroiller Jean-François, Slosman Tatiana, Cnaani Avner. 2018. Effects of the acclimation to high salinity on intestinal ion and peptide transporters in two tilapia species that differ in their salinity tolerance. Comparative Biochemistry and Physiology. Part A, Molecular and Integrative Physiology, 218 : 16-23.

Quartile : Q1, Sujet : ZOOLOGY / Quartile : Q3, Sujet : PHYSIOLOGY / Quartile : Q3, Sujet : BIOCHEMISTRY & MOLECULAR BIOLOGY

Résumé : Tilapiine species, widely distributed across habitats with diverse water salinities, are important to aquaculture as well as a laboratory model. The effects of water salinity on two tilapia species, that differ in their salinity tolerance, was evaluated. Oreochromis niloticus reared in brackish-water, showed a significant decrease in growth and feed efficiency, whereas O. mossambicus reared in seawater did not show any significant changes. The expression and activity of Na+/K+-ATPase (NKA), V-type H+-ATPase (VHA) and carbonic anhydrase (CA), as well as expression levels of genes encoding two HCO3− and three peptide transporters (nbc1, slc26a6, slc15a1a, slc15a1b and slc15a2) were measured in three intestinal sections of these two species, grown in freshwater and brackish/sea-water. Overall, the spatial distribution along the intestine of the genes examined in this study was similar between the two species, with the exception of tcaIV. The salinity response, on the other hand, varied greatly between these species. In O. mossambicus, there was a salinity-dependent increased expression of most of the examined genes (except slc26a6 and slc15a2), while in O. niloticus the expression of most genes did not change, or even decreased (tcaIV, nbc1 and slc15a1b). This study highlighted differences in the intestinal response to salinity acclimation between closely- related species that differ in their salinity tolerance. O. mossambicus, which has a high salinity tolerance, showed expression patterns and responses similar to marine species, and differed from the low-salinity-tolerance O. niloticus, which showed a response that differed from the accepted models, that are based on marine and diadromous fishes.

Mots-clés Agrovoc : Oreochromis mossambicus, Oreochromis niloticus, tolérance au sel, Tilapia, poisson diadrome, tolérance à l'eau, aquaculture, carbonate déshydratase

Mots-clés libres : Oreochromis mossambicus, Oreochromis niloticus, Salinity challenge, Ion transporters, PepT1, PepT2

Classification Agris : L50 - Physiologie et biochimie animales
M12 - Production de l'aquaculture

Champ stratégique Cirad : Axe 1 (2014-2018) - Agriculture écologiquement intensive

Auteurs et affiliations

• Chourasia Tapan Kumar, ARO (ISR)
• D'Cotta Helena, CIRAD-PERSYST-UMR ISEM (FRA) ORCID: 0000-0003-2739-3476
• Baroiller Jean-François, CIRAD-PERSYST-UMR ISEM (FRA) ORCID: 0000-0002-0992-1725
• Slosman Tatiana, ARO (ISR)
• Cnaani Avner, ARO (ISR) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/587098/)

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