Water competition in the soil by rootstocks is used to assess drought tolerance in citrus

Rodrigues de Oliveira Sousa Andressa, Coelho Filho Mauricio Antonio, Rodrigues da Silva Adielle, Marques dos Santos Liziane, de Carvalho Silva Matheus, Silva da Cruz Elaine, da Silva Ledo Carlos Alberto, dos Santos Soares Filho Walter, Cardoso Costa Marcio Gilberto, Micheli Fabienne, Da Silva Gesteira Abelmon. 2024. Water competition in the soil by rootstocks is used to assess drought tolerance in citrus. South African Journal of Botany, 164 : 23-30.

https://doi.org/10.1016/j.sajb.2023.11.036

Article de revue ; Article de recherche ; Article de revue à facteur d'impact

Version publiée - Anglais
Accès réservé aux personnels Cirad
Utilisation soumise à autorisation de l'auteur ou du Cirad.
2024 Souza et al South African Journal of Botany.pdf
Télécharger (1MB) | Demander une copie

Résumé : Brazil is a country focused on agribusiness and is the world's largest producer of orange juice. However, citrus production in certain regions of the world is affected by irregular rainfall, which imposes drought stress conditions and causes behavioral changes in plant survival, growth, and productivity. In this context, the objective of this work was to assess a methodology for the selection of citrus rootstocks tolerant to drought when exposed to water deficit regimes. This work was conceived with prior knowledge of the responses to drought tolerance of three rootstocks: Rangpur Lime (RL), Sunki Tropical (ST) and Sunki Maravilha (SM). The study was carried out with Valencia Orange (VO) scion varieties grafted on these three rootstocks. Two plants were conditioned per pot, forcing competition for available water in the soil, and all combinations were exposed to three different water regimes (irrigated, water deficit, and rehydrated). The hydric and physiological relationships were then evaluated. The results showed that in addition to the availability of water, the association between genotypes in the same pot caused different physiological responses. In view of the contrasting strategies of survival/tolerance adopted by these genotypes in response to water deficit, the combination with RL allowed a higher tolerance, showing less water extraction, lower leaf water potential, and relative water content, as well as an increase in the photosynthetic parameters when combined mainly with SM. The methodology used is a promising and more effective tool for analyses of citrus plants under drought stress conditions.

Mots-clés Agrovoc : stress dû à la sécheresse, Citrus, porte greffe, physiologie végétale, tolérance à la sécheresse, résistance à la sécheresse, génotype, déficit d'humidité du sol, greffon, greffage, sécheresse, régime hydrique du sol, méthodologie, réponse de la plante