Use este identificador para citar ou linkar para este item: https://locus.ufv.br//handle/123456789/22047
Tipo: Artigo
Título: Reciprocal grafting between clones with contrasting drought tolerance suggests a key role of abscisic acid in coffee acclimation to drought stress
Autor(es): Silva, Vânia Aparecida
Prado, Fernanda Manso
Antunes, Werner Camargos
Paiva, Rita Márcia Cardoso
Ferrão, Maria Amélia Gava
Andrade, Alan Carvalho
Mascio, Paolo Di
Loureiro, Marcelo Ehlers
DaMatta, Fábio Murilo
Almeida, Andréa Miyasaka
Abstract: The role of abscisic acid (ABA) in drought tolerance of Coffea canephora is unknown. To determine whether ABA is associated with drought tolerance and if the use of tolerant rootstocks could increase ABA and drought tolerance, we performed reciprocal grafting experiments between clones with contrasting tolerance to drought (clone 109, sensitive; and clone 120, tolerant). Plants were grown in large (120 L) pots in a greenhouse and subjected to drought stress by withholding irrigation. The non-grafted 120 plants and graft treatments with 120 as a rootstock showed a slower reduction of predawn leaf water potential (Ψpd) and a lower negative carbon isotopic composition ratio compared with the other grafting combinations in response to drought. The same 120 graft treatments also showed higher leaf ABA concentrations, lower levels of electrolyte leakage, and lower activities of ascorbate peroxidase and catalase under moderate (Ψpd = − 1.0 or − 1.5 MPa) and severe (Ψpd = − 3.0 MPa) drought. Root ABA concentrations were higher in plants with the 120 rootstocks regardless of watering regime. The 120 shoots could also contribute to drought tolerance because treatment with 120/109 rootstock/scion combination showed postponed dehydration, higher leaf ABA concentration, and lower leaf electrolyte leakage compared with the sensitive clone. We conclude that both the shoot and root systems of the tolerant clone can increase the concentrations of ABA in leaves in response to drought. This further suggests that ABA is associated with a delayed onset of severe water deficit and decreased oxidative damage in C. canephora.
Palavras-chave: ABA
Coffee
Oxidative stress
Photosynthesis
Water deficit
Mass spectrometry
Editor: Plant Growth Regulation
Tipo de Acesso: Springer Nature Switzerland AG.
URI: http://dx.doi.org/10.1007/s10725-018-0385-5
http://www.locus.ufv.br/handle/123456789/22047
Data do documento: 8-Mar-2018
Aparece nas coleções:Artigos

Arquivos associados a este item:
Arquivo Descrição TamanhoFormato 
artigo.pdf
  Until 2100-12-31
texto completo1,5 MBAdobe PDFVisualizar/Abrir    Solictar uma cópia


Os itens no repositório estão protegidos por copyright, com todos os direitos reservados, salvo quando é indicado o contrário.