Better tolerance to water deficit in doubled diploid 'Carrizo citrange' compared to diploid seedlings is associated with more limited water consumption and better H2O2 scavenging

Oliveira Tahise M., Ben Yahmed Jihane, Dutra Joadson, Maserti Bianca Elena, Talon Manuel, Navarro Luis, Ollitrault Patrick, Gesteira Abelmon S., Morillon Raphaël. 2017. Better tolerance to water deficit in doubled diploid 'Carrizo citrange' compared to diploid seedlings is associated with more limited water consumption and better H2O2 scavenging. Acta Physiologiae Plantarum, 39:e204, 13 p.

https://doi.org/10.1007/s11738-017-2497-3

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

Version publiée - Anglais
Accès réservé aux personnels Cirad
Utilisation soumise à autorisation de l'auteur ou du Cirad.
Oliveira et al 2017 .pdf
Télécharger (950kB) | Demander une copie

Quartile : Q2, Sujet : PLANT SCIENCES

Résumé : Tolerance to water deficit in diploid (2x) and doubled diploid (4x) 'Carrizo citrange' (Citrus sinensis [L.] Osbeck × Poncirus trifoliata [L.] Raf) was investigated. Water deficit was applied for 4 weeks. Physiological parameters, including stomatal conductance (gs), photosynthesis (A), transpiration (E), leaf and soil water potentials (Ψleaf; Ψsoil), and pot water loss, were monitored throughout the stress. Moreover, ABA, H2O2 contents, and the expression of genes involved in ABA biosynthesis (NCED3), regulation of abscisic acid signaling (ABI1), and coding for a catalase enzyme (CAT2) known to favor H2O2 scavenging were monitored. During the experiment gs, A, and E values were most of the time higher in 2x compared to 4x. During the water deficit period, pot water loss decreased faster in 2x compared to 4x, leading to a faster decrease in all physiological parameters in 2x. The higher sensitivity of 2x compared to 4x was correlated with more numerous thinner roots, higher leaf ABA and H2O2 contents, and with the lower leaf water potential. ABI1 and NCED3 expression was not strictly correlated with the ABA content. However, the higher CAT2 expression in 4x was correlated with the lower leaf H2O2 contents. Therefore, the better tolerance observed in 4x 'Carrizo citrange' compared to 2x was associated with more limited water consumption and better and H2O2 scavenging.

Mots-clés Agrovoc : Citrus sinensis, Poncirus trifoliata, photosynthèse, citrange, expression des gènes, stress dû à la sécheresse, tolérance à l'eau, catalase, Citrus, biosynthèse, consommation, physiologie végétale