Genotypic variability in radial resistance to water flow in olive roots and its response to temperature variations
Autor/a
López-Bernal, A.
García-Tejera, O.
Testi, L.
Villalobos, F.J.
Fecha de publicación
2020-02-06ISBN
0829-318X
Resumen
As radial root resistance (Rp) represents one of the key components of the soil–plant–atmosphere continuum resistance catena modulating water transport, understanding its control is essential for physiologists, modelers and breeders. Reports of Rp, however, are still scarce and scattered in the scientific literature. In this study, we assessed genetic variability in Rp and its dependence on temperature in five widely used olive cultivars. In a first experiment, cultivar differences in Rp at 25 °C were evaluated from flow–pressure measurements in excised roots and subsequent analysis of root traits. In a second experiment, similar determinations were performed continually over a 5-h period in which temperature was gradually increased from 12 to 32 °C, enabling the assessment of Rp response to changing temperature. Despite some variability, our results did not show statistical differences in Rp among cultivars in the first experiment. In the second, cultivar differences in Rp were not significant at 12 °C, but they became so as temperature increased. Furthermore, the changes in Rp between 12 and 32 °C were higher than those expected by the temperature-driven decrease in water viscosity, with the degree of that change differing among cultivars. Also, Rp at 25 °C reached momentarily in the second experiment was consistently higher than in the first at that same, but fixed, temperature. Overall, our results suggest that there is limited variability in Rp among the studied cultivars when plants have been exposed to a given temperature for sufficient time. Temperature-induced variation in Rp might thus be partly explained by changes in membrane permeability that occur slowly, which explains why our values at 25 °C differed between experiments. The observed cultivar differences in Rp with warming also indicate faster acclimation of Rp to temperature changes in some cultivars than others.
Tipo de documento
Artículo
Versión del documento
Versión aceptada
Lengua
English
Materias (CDU)
631 - Agricultura. Agronomía. Maquinaria agrícola. Suelos. Edafología agrícola
633 - Cultivos y producciones
Páginas
27
Publicado por
Oxford University Press (OUP)
Publicado en
Tree Physiology
Citación
López-Bernal, Á, O García-Tejera, L Testi, and F J Villalobos. 2020. "Genotypic Variability In Radial Resistance To Water Flow In Olive Roots And Its Response To Temperature Variations". Tree Physiology 40 (4): 445-453. doi:10.1093/treephys/tpaa010.
Número del acuerdo de la subvención
MINECO/Programa Estatal de I+D+I orientada a los retos de la sociedad/AGL2015-69822-R/ES/Simulación de la productividad del olivo: Calibración de cultivares y adaptación a nuevas areas y condiciones ambientales/
EC/H2020/652615/EU/Sustainable and Resilient agriculture for food and non-food systems/FACCE SURPLUS
MINECO/Programa Estatal de I+D+I orientada a los retos de la sociedad/PCIN-2015-259/ES/SISTEMA DE TOMA DE DECISIONES PARA EL MANEJO DEL AGUA EN LA AGRICULTURA MEDIANTE SENSORES REMOTOS Y DE CAMPO/
MINECO/Programa Estatal de promoción del talento y su empleabilidad en I+D+I/FJCI-2015-24109/ES/ /
MINECO/Programa Estatal de promoción del talento y su empleabilidad en I+D+I/FJCI-2017-34086/ES/ /
Program
Ús Eficient de l'Aigua en Agricultura
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