Metabolic responses to drought stress and rehydration in leaves and roots of three Citrus scion/rootstock combinations

Rodrigues de Oliveira Sousa Andressa, De Andrade Silva Edson Mario, Coelho Filho Mauricio Antonio, Cardoso Costa Marcio Gilberto, dos Santos Soares Filho Walter, Micheli Fabienne, Maserti Bianca Elena, Da Silva Gesteira Abelmon. 2022. Metabolic responses to drought stress and rehydration in leaves and roots of three Citrus scion/rootstock combinations. Scientia Horticulturae, 292:110490, 13 p.

Résumé : Drought is one of the most destructive environmental challenges for agriculture, and citrus trees are cultivated in semiarid areas. The current study used physiological and untarget mass spectrometry analysis to assess the differential response to drought and rehydration in leaves and roots of three scion/rootstock combinations in which the same scion Valencia Orange was grafted onto three different rootstocks, namely, 'Rangpur Lime', 'Sunki Maravilha' and 'Sunki Tropical', known to have a different response to drought. The main question to be answer was whether the soil disease tolerant 'Sunki Tropical' could be used as alternative to the drought tolerant/disease susceptible rootstock 'Rangpur lime' to cultivate citrus in semiarid areas. Thirty-seven metabolites in leaves and forty-six in roots, mainly amino acids, as well as a few carbohydrates and organic acids were found differentially expressed after drought and/or rehydration in the three combinations. Overall, the results demonstrated that the three scion/rootstock combinations responded differently at metabolite levels to water changes. The few leaf metabolites found in the scion grafted on 'Rangpur Lime' and 'Sunki Maravilha' support the respective drought avoidance and tolerance strategy, already observed in those rootstocks.'Rangur Lime' and 'Sunki Tropical' shared at roots levels several common drought response mechanisms. Moreover, the high number of differential metabolites triggered in the scion by 'Sunki Tropical' seems to be useful for overcoming the drought effects without depleting the fruit quality. From our data, we argue that 'Sunki Tropical' is a drought tolerant genotypes that could be used as alternative to 'Ranpur Lime' to sustain citrus production in semiarid areas.

Mots-clés Agrovoc : tolérance à la sécheresse, réponse de la plante, stress dû à la sécheresse, Citrus, porte greffe, greffon, feuille, racine, métabolite, mécanisme de défense, potentiel hydrique foliaire, potentiel hydrique des racines

Mots-clés libres : Amino acids, Carbohydrates, Citrus, Metabolic profile, Drought, Rootstock

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

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

Auteurs et affiliations

• Rodrigues de Oliveira Sousa Andressa, UESC (BRA)
• De Andrade Silva Edson Mario, UESC (BRA)
• Coelho Filho Mauricio Antonio, EMBRAPA (BRA)
• Cardoso Costa Marcio Gilberto, UESC (BRA)
• dos Santos Soares Filho Walter, EMBRAPA (BRA)
• Micheli Fabienne, CIRAD-BIOS-UMR AGAP (FRA)
• Maserti Bianca Elena, CNR (ITA) - auteur correspondant
• Da Silva Gesteira Abelmon, UESC (BRA) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/599461/)

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