Cadmium accumulation in cacao plants (Theobroma cacao L.) under drought stress

Ortiz-Álvarez Antonio, Magnitskiy Stanislav, Silva-Arero Elías Alexander, Rodriguez-Medina Caren, Argout Xavier, Castaño-Marín Ángela María. 2023. Cadmium accumulation in cacao plants (Theobroma cacao L.) under drought stress. Agronomy (Basel), 13 (10):2490, 18 p.

Résumé : The objective of this study was to determine Cd accumulation under water-deficit conditions by young cacao plants. The study was conducted under greenhouse conditions. Two full-sib families (IMC67 × PA121 and SCA6 × PA121), obtained through controlled crosses, and an open pollinated half-sib seedling family of IMC67, widely used as rootstock in Colombia, were employed. Plants were grown in Cd-contaminated soil (0.356 mg kg−1) without external sources of the metal. They were subjected to water deficit by suspending irrigation for consecutive periods of 19 and 27 days (D19 and D27), followed by rehydration. Water stress reduced leaf water potential (Ψleaf) with values from −1.51 to −2.09 MPa, with full-sib family SCA6 × PA121 being the most tolerant to water deficit. Cd concentration was influenced by biomass reduction (observed in IMC67 × PA121 and SCA6 × PA121) and transpiration rate (evident in IMC67) caused by water deficit. Full-sib progenies IMC67 × PA121 and SCA6 × PA121 accumulated more Cd in the plants than open pollinated IMC67, with higher Cd accumulation in leaves. The translocation factor (TF) revealed that the aboveground organs of the progenies were enriched with Cd (TF > 4). Water deficit increased Cd translocation from roots to leaves in IMC67 × PA121 and IMC 67, while there were no significant changes in SCA6 × PA121. Full-sib family SCA6 × PA121 stood out as the most promising progenies due to their water-stress tolerance and Cd accumulation stability. This study introduces a discussion about the influence of water stress on Cd accumulation in Theobroma cacao.

Mots-clés Agrovoc : Theobroma cacao, stress dû à la sécheresse, physiologie végétale, porte greffe, cadmium, fève de cacao, tolérance à la sécheresse, résistance à la sécheresse, translocation, métal lourd

Mots-clés géographiques Agrovoc : Colombie

Mots-clés libres : Theobroma cacao, Water stress, Genotype, Progeny, Tolerance, Cd uptake, Cd translocation

Classification Agris : P02 - Pollution
F60 - Physiologie et biochimie végétale
Q03 - Contamination et toxicologie alimentaires

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

Agences de financement européennes : European Commission

Projets sur financement : (EU) Development Smart Innovation through Research in Agriculture, (EU) Clima-LoCa

Auteurs et affiliations

• Ortiz-Álvarez Antonio, Universidad Nacional de Colombia (COL) - auteur correspondant
• Magnitskiy Stanislav, Universidad Nacional de Colombia (COL)
• Silva-Arero Elías Alexander, CORPOICA (COL)
• Rodriguez-Medina Caren, CORPOICA (COL)
• Argout Xavier, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0002-0100-5511
• Castaño-Marín Ángela María, CORPOICA (COL)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/607528/)

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