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Revisiting Citrus Rootstocks Polyploidy as a Means to Improve Drought Resilience: Sometimes Less Is More.
da Silva Costa, Lucas; Coelho Filho, Maurício Antonio; Araújo da Silva, Monique Ayala; Moreira, Alécio Souza; Dos Santos Soares Filho, Walter; Freschi, Luciano; da Silva Gesteira, Abelmon.
Afiliação
  • da Silva Costa L; Departamento de Biologia, Centro de Genética e Biologia Molecular, Universidade Estadual de Santa Cruz, Ilhéus, Brazil.
  • Coelho Filho MA; Embrapa Mandioca e Fruticultura, Cruz das Almas, Brazil.
  • Araújo da Silva MA; Departamento de Biologia, Centro de Genética e Biologia Molecular, Universidade Estadual de Santa Cruz, Ilhéus, Brazil.
  • Moreira AS; Embrapa Mandioca e Fruticultura, Cruz das Almas, Brazil.
  • Dos Santos Soares Filho W; Embrapa Mandioca e Fruticultura, Cruz das Almas, Brazil.
  • Freschi L; Departamento de Botânica, Instituto de Biociências, Universidade de São Paulo, São Paulo, Brazil.
  • da Silva Gesteira A; Departamento de Biologia, Centro de Genética e Biologia Molecular, Universidade Estadual de Santa Cruz, Ilhéus, Brazil.
Plant Cell Environ ; 2024 Sep 10.
Article em En | MEDLINE | ID: mdl-39254282
ABSTRACT
Polyploid varieties have been suggested as an alternative approach to promote drought tolerance in citrus crops. In this study, we compared the responses of diploid and tetraploid Sunki 'Tropical' rootstocks to water deficit when grafted onto 'Valencia' sweet orange trees and subjected to water withholding in isolation or competition experiments under potted conditions. Our results revealed that, when grown in isolation, tetraploid rootstocks took longer to show drought symptoms, but this advantage disappeared when grown in competition under the same soil moisture conditions. The differences in drought responses were mainly associated with variations in endogenous leaf levels of abscisic acid (ABA), hydrogen peroxide (H2O2) and carbohydrates among treatments. Overall, tetraploids were more affected by drought in individual experiments, showing higher H2O2 production, and in competition experiments, rapidly increasing ABA production to regulate stomatal closure and reduce water loss through transpiration. Therefore, our results highlight the crucial importance of evaluating diploid and tetraploid rootstocks under the same soil moisture conditions to better simulate field conditions, providing important insights to improve selection strategies for more resilient citrus rootstocks.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Plant Cell Environ Assunto da revista: BOTANICA Ano de publicação: 2024 Tipo de documento: Article País de afiliação: Brasil País de publicação: Estados Unidos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Plant Cell Environ Assunto da revista: BOTANICA Ano de publicação: 2024 Tipo de documento: Article País de afiliação: Brasil País de publicação: Estados Unidos