Evaluation of the adaptation of citrus polyploid (rootstocks/varieties Associations) to water deficit

Calvez Lény, Sivager Gary, Andypain Sandrine, Bruyère Saturnin, Gros Olivier, Brat Pierre, Morillon Raphaël. 2019. Evaluation of the adaptation of citrus polyploid (rootstocks/varieties Associations) to water deficit. In : Abstract book of the Caribbean Science and Innovation Meeting : Coopérer sur les problématiques communes au territoires Caribéens. UAG. Le Gosier : UAG, Résumé, 22. Caribbean Science and Innovation Meeting (CSIM 2019), Le Gosier, Chine, 19 Octobre 2019/22 Octobre 2019.

Url - autre : https://www.guadeloupe-parcnational.fr/sites/guadeloupe-parcnational.fr/files/atoms/files/csim_-_abstracts_book.pdf

Résumé : Huanglongbing (HLB) is a bacterial disease caused by the phloem restricted bacteria Candidatus liberibacter spp. In Guadeloupe, the disease has been present since 2012 and is responsible of the eradication of most of the orchards. In the field, trees in water deficit condition are more sensitive to the disease. Various studies showed that tetraploid (4x) rootstocks confer a better adaptation to drought condition. Also, recent work of CIRAD showed that triploid (3x) Tahiti lime are more tolerant to HLB than the respective diploid (2x) Mexican lime. Thus, we initiated a study to verify whether the use of 4x rootstocks in association with 3x lime can improve tree adaptation to water deficit. 2x and 3x limes grafted onto 2x and 4x rootstocks were evaluated. Physiological and biochemical traits were investigated. Preliminary results suggest that 4x rootstock confer a better tolerance to the scion. Also, better detoxification seems to occur in the triploid scion. This experiment will be coupled to gene expression studies in roots and leaves.

Auteurs et affiliations

• Calvez Lény, CIRAD-BIOS-UMR AGAP (GLP)
• Sivager Gary, CIRAD-BIOS-UMR AGAP (GLP)
• Andypain Sandrine, CIRAD-PERSYST-UMR Qualisud (GLP)
• Bruyère Saturnin, CIRAD-BIOS-UMR AGAP (GLP)
• Gros Olivier, UAG (GLP)
• Brat Pierre, CIRAD-PERSYST-UMR Qualisud (FRA) ORCID: 0000-0003-0429-9575
• Morillon Raphaël, CIRAD-BIOS-UMR AGAP (GLP)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/595670/)

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