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Effect of propagation method and ploidy level of various rootstocks on the response of the common clementine (Citrus clementina Hort. ex Tan) to a mild water deficit

Oustric Julie, Lourkisti Radia, Herbette Stéphane, Morillon Raphaël, Paolacci Gilles, Gonzalez Noémie, Berti Liliane, Santini Jérémie. 2020. Effect of propagation method and ploidy level of various rootstocks on the response of the common clementine (Citrus clementina Hort. ex Tan) to a mild water deficit. Agriculture (Basel), 10 (8):321, 21 p.

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Abstract : Current climatic upheavals reduce water availability which impacts the growth and fruit quality of plants. In citrus crops, scion/rootstock combinations are used to ensure high fruit production and quality and a stress tolerance/resistance. Our objective was to assess the e_ect on the clementine scion (C) under natural mild water deficit of (i) polyploid rootstocks by comparing the allotetraploid FlhorAG1 (C/4xFLs; trifoliate orange +Willowleaf mandarin) with its diploid parents, trifoliate orange (C/2xTOs), and Willowleaf mandarin (C/2xWLs), and with a diploid genotype used as reference (Carrizo citrange, C/2xCCs), (ii) rootstock propagation methods by comparing trifoliate orange seedling (C/2xTOs) with cutting (C/2xTOc). A mild water deficit observed under orchard conditions during the summer period (July–August) induced a significant change in yield (except in C/2xTOs), fruit size, and quality. C/2xCCs, C/2xTOs, and C/2xWLs appeared less a_ected by water deficit as indicated by their lower reduction of predawn leaf water potential (Ypd), relative water content (RWC), transpiration (E), and photosynthetic parameters (Pnet and gs). Their greater redox balance was probably due to their better antioxidant e_ciency. Seedling rootstocks lead to a better adaptation of clementine scions to water deficit than cutting or allotetraploid rootstock. Improving the tolerance to water deficit requires taking into consideration the rootstock genotype, propagation method, and ploidy level.

Mots-clés Agrovoc : Citrus, Porte greffe, Poncirus trifoliata, Citrus sinensis, Stress dû à la sécheresse, Verger, Rendement des cultures, Fruit, Propriété organoleptique, Photosynthèse

Mots-clés géographiques Agrovoc : Corse, France

Mots-clés complémentaires : Citrus deliciosa

Mots-clés libres : Antioxidant, Citrus, Fruit parameters, Oxidative stress, Photosynthetic capacity, Water deficit

Classification Agris : F62 - Plant physiology - Growth and development

Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques

Auteurs et affiliations

  • Oustric Julie, CNRS (FRA) - auteur correspondant
  • Lourkisti Radia, CNRS (FRA)
  • Herbette Stéphane, INRAE (FRA)
  • Morillon Raphaël, CIRAD-BIOS-UMR AGAP (GLP)
  • Paolacci Gilles, AREFLEC (FRA)
  • Gonzalez Noémie, CNRS (FRA)
  • Berti Liliane, CNRS (FRA)
  • Santini Jérémie, CNRS (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/597489/)

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