Reciprocal grafting between clones with contrasting drought tolerance suggests a key role of abscisic acid in coffee acclimation to drought stress
| Autor: | Rita Márcia Cardoso Paiva, Paolo Di Mascio, Fábio M. DaMatta, Vânia Aparecida Silva, Alan Carvalho Andrade, Andrea Miyasaka Almeida, Marcelo Ehlers Loureiro, Werner Camargos Antunes, Fernanda M. Prado, Maria Amélia Gava Ferrão |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
0301 basic medicine Physiology Canephora Drought tolerance Plant Science Biology Coffea canephora 01 natural sciences Acclimatization Coffee 03 medical and health sciences chemistry.chemical_compound Photosynthesis Abscisic acid Water deficit Mass spectrometry fungi food and beverages Plant physiology ESPECTROMETRIA DE MASSAS biology.organism_classification Horticulture 030104 developmental biology chemistry ABA Oxidative stress Shoot Rootstock Agronomy and Crop Science 010606 plant biology & botany |
| Zdroj: | LOCUS Repositório Institucional da UFV Universidade Federal de Viçosa (UFV) instacron:UFV Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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