| Texto completo | |
| Autor(es): |
Miranda, Marcela T.
;
Espinoza-Nunez, Erick
;
Silva, Simone F.
;
Pereira, Luciano
;
Hayashi, Adriana H.
;
Boscariol-Camargo, Raquel L.
;
Carvalho, Sergio A.
;
Machado, Eduardo C.
;
Ribeiro, Rafael, V
Número total de Autores: 9
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Plant Science; v. 319, p. 9-pg., 2022-03-22. |
| Resumo | |
Morpho-physiological strategies to deal with water deficit vary among citrus species and the chemical signaling through ABA and anatomical, hydraulic, and physiological traits were evaluated in saplings of Rangpur lime, Swingle citrumelo and Valencia sweet orange. Trunk and roots of Swingle citrumelo presented lower vessel diameter and higher vessel frequency as compared to the other species. However, relative water content at the turgor loss point (RWCTLP), the osmotic potential at full turgor (Psi(0)), the osmotic potential at the turgor loss point (Psi(TLP)), bulk modulus of elasticity (epsilon) and the xylem water potential when hydraulic conductivity is reduced by 50% (Psi(50)) and 88% (Psi(88)) indicated similar hydraulic traits among citrus species, with Rangpur lime showing the highest hydraulic safety margin. Roots of Rangpur lime and Swingle citrumelo were more water conductive than ones of Valencia sweet orange, which was linked to higher stomatal conductance. Chemical signaling through ABA prevented shoot dehydration in Rangpur lime under water deficit, with this species showing a more conservative stomatal behavior, sensing, and responding rapidly to low soil moisture. Taken together, our results suggest that Rangpur lime - the drought tolerant species - has an improved control of leaf water status due to chemical signaling and effective stomatal regulation for reducing water loss as well as decreased root hydraulic conductivity for saving water resources under limiting conditions. (AU) | |
| Processo FAPESP: | 18/09834-5 - Vulnerabilidade ao embolismo em espécies cítricas: características hidráulicas, variação sazonal e relações entre copa e porta-enxerto |
| Beneficiário: | Marcela Trevenzoli Miranda |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 19/15276-8 - Vulnerabilidade ao embolismo em espécies cítricas: características hidráulicas, variação sazonal e relações entre copa e porta-enxerto |
| Beneficiário: | Eduardo Caruso Machado |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 11/16263-5 - Papel do porta-enxerto na tolerância à seca: sinalização, relações hídricas, fotossíntese e crescimento |
| Beneficiário: | Erick Espinoza Nuñez |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |