Triploidy in citrus genotypes improved leaf gas exchange and antioxidant recovery from water deficit

Lourkisti Radia, Froelicher Yann, Herbette Stéphane, Morillon Raphaël, Giannettini Jean, Berti Liliane, Santini Jérémie. 2021. Triploidy in citrus genotypes improved leaf gas exchange and antioxidant recovery from water deficit. Frontiers in Plant Science, 11:615335, 14 p.

https://doi.org/10.3389/fpls.2020.615335

Article de revue ; Article de recherche ; Article de revue à facteur d'impact Revue en libre accès total

Prévisualisation

Version publiée - Anglais
Sous licence

.
Lourkisti et al 2021.pdf
Télécharger (6MB) | Prévisualisation

Quartile : Q1, Sujet : PLANT SCIENCES

Résumé : The triploidy has proved to be a powerful approach breeding programs, especially in Citrus since seedlessness is one of the main consumer expectations. Citrus plants face numerous abiotic stresses including water deficit, which negatively impact growth and crop yield. In this study, we evaluated the physiological and biochemical responses to water deficit and recovery capacity of new triploid hybrids, in comparison with diploid hybrids, their parents (“Fortune” mandarin and “Ellendale” tangor) and one clementine tree used as reference. The water deficit significantly decreased the relative water content (RWC) and leaf gas exchange (Pnet and gs) and it increased the levels of oxidative markers (H2O2 and MDA) and antioxidants. Compared to diploid varieties, triploid hybrids limited water loss by osmotic adjustment as reflected by higher RWC, intrinsic water use efficiency (iWUE Pnet/gs) iWUE and leaf proline levels. These had been associated with an effective thermal dissipation of excess energy (NPQ) and lower oxidative damage. Our results showed that triploidy in citrus enhances the recovery capacity after a water deficit in comparison with diploids due to better carboxylation efficiency, restored water-related parameters and efficient antioxidant system.

Mots-clés Agrovoc : Citrus, triploïdie, stress dû à la sécheresse, réponse de la plante, osmorégulation, échange gazeux, antioxydant, tolérance à la sécheresse, résistance à la sécheresse

Mots-clés libres : Osmotic adjustment, Oxidative status, Photosynthesis, Polyploidy, Water deficit

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

Auteurs et affiliations