Interaction of reserves and osmoprotection in dwarf cashew clones under water stress

Authors

  • Anselmo Ferreira da Silva
  • Valéria Fernandes de Oliveira Sousa
  • Rejane Maria Nunes Mendonça
  • Josemir Moura Maia
  • Agda Malany Forte de Oliveira
  • Francisco Hélio Alves de Andrade
  • Marília Hortência Batista Silva Rodrigues
  • Franciscleudo Bezerra da Costa

Abstract

Adverse conditions such as low rainfall have led to a reduction in cashew productive areas in the Brazilian Northeast region. The use of rootstocks and scions with characteristic metabolites associated with drought tolerance influences the plant responses. This study aimed to evaluate the interaction between energetic reserves and osmoprotection in grafted dwarf cashew clones under water restriction. The experiment followed a randomized block design, in a 4 × 4 factorial scheme, consisting of four irrigation levels (25, 50, 75 and 100 % of the crop evapotranspiration - ETc) and four scion/rootstock combinations: CCP76/CCP76 (self-graft of CCP76), CCP76/BRS226 (CCP76 grafted onto BRS226), BRS226/BRS226 (self-graft of BRS226) and BRS226/CCP76 (BRS226 grafted onto CCP76), with three replications. Measurements included scion and rootstock stem diameter, relative water content, leaf moisture percentage, membrane damage, carbohydrates, total free amino acids, total soluble proteins, glycine betaine, proline and ionic content. The CCP76/BRS226 combination was efficient under water-restricted conditions (25 and 50 % of the ETc), as evidenced by a significant reduction in the oxidative damages to leaf membranes and a concomitant increase in osmoprotectants such as total free amino acids and proline. Proline emerges as a potential molecular marker for drought tolerance in early dwarf cashew trees. The self-grafted BRS226 and the BRS226/CCP76 combination under the irrigation with 25 % of the ETc were the most affected, exhibiting greater membrane damage, lower foliar potassium accumulation, moisture content and relative water content, and are therefore not recommended under water-restricted conditions.

KEYWORDS: Anacardium occidentale L., osmoprotectants, grafting.

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Published

2025-05-27

How to Cite

SILVA, Anselmo Ferreira da; SOUSA, Valéria Fernandes de Oliveira; MENDONÇA, Rejane Maria Nunes; MAIA, Josemir Moura; OLIVEIRA, Agda Malany Forte de; ANDRADE, Francisco Hélio Alves de; RODRIGUES, Marília Hortência Batista Silva; COSTA, Franciscleudo Bezerra da. Interaction of reserves and osmoprotection in dwarf cashew clones under water stress. Pesquisa Agropecuária Tropical [Agricultural Research in the Tropics], Goiânia, p. e81500, 2025. Disponível em: https://revistas.ufg.br/pat/article/view/81500. Acesso em: 19 dec. 2025.

Issue

v. 55 (2025)

Section

Research Article

License

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