Comparison of photosynthesis and antioxidant performance of several Citrus and Fortunella species under natural chilling stress : S08P24

Santini Jérémie, Giannettini Jean, Pailly Olivier, Herbette Stéphane, Ollitrault Patrick, Berti Liliane, Luro François. 2012. Comparison of photosynthesis and antioxidant performance of several Citrus and Fortunella species under natural chilling stress : S08P24. In : XII International Citrus Congress : Book of abstract. Navarro Luis (ed.). ISC, IVIA, Fundación agroalimed. Riverside : ISC, Résumé, 129-130. International Citrus congress "Citrus and health. 12, Valence, Espagne, 18 Novembre 2012/23 Novembre 2012.

Résumé : Citrus plants originate from southeastern Asia, in a large area with various climates characterized by a broad range of temperatures. Temperature is assumed to be a key factor in Citrus species adaptation and diversification. In a field experiment, the tolerance of the three fundamental Citrus species (C. medica -citron-, C. reticulata -mandarin- and C. maxima -pummelo-) and Fortunella japonica -kumquat- to photooxidative stress caused by seasonal climatic changes was evaluated on adult trees by measuring net photosynthesis (Pnet), stomatal conductance (Gs), maximum photosynthesis (Pmax) and chlorophyll fluorescence (Fv/Fm). In addition, seasonal changes in oxidative status, antioxidant enzymes and antioxidant metabolites were monitored. Mandarin and pummelo appeared to be the most tolerant, showing the lowest down-regulation of photosynthetic parameters, and the lowest accumulation of oxidized compounds associated with efficiency of their antioxidant system. Kumquat showed intermediate behaviour, with a large diminution of photosynthetic parameters and marked accumulation of hydrogen peroxide, whereas the malondialdehyde content remained low, with a strong induction of glutathione synthesis. Finally, citron appeared to be the most sensitive genotype with a marked decrease in photosynthetic performance, the largest accumulation of oxidative parameters, insufficient induction of antioxidant enzymes and down-regulation of ascorbate and glutathione synthesis. (Texte integral)

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

Auteurs et affiliations

• Santini Jérémie, INRA (FRA)
• Giannettini Jean, CNRS (FRA)
• Pailly Olivier, INRA (FRA)
• Herbette Stéphane, INRA (FRA)
• Ollitrault Patrick, CIRAD-BIOS-UMR AGAP (ESP) ORCID: 0000-0002-9456-5517
• Berti Liliane, CNRS (FRA)
• Luro François, INRA (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/567344/)

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