2026-04-13T12:31:27Zhttps://recercat.cat/oai/requestoai:recercat.cat:20.500.12327/11112025-10-22T11:09:26Zcom_2072_4428com_2072_4427col_2072_487898
RECERCAT
author
López-Bernal, A.
author
García-Tejera, O.
author
Testi, L.
author
Villalobos, F.J.
other
Producció Vegetal
group
Ús Eficient de l'Aigua en Agricultura
2025-10-22T11:09:26Z
2025-10-22T11:09:26Z
2020-02-06
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.
0829-318X
http://hdl.handle.net/20.500.12327/1111
https://doi.org/10.1093/treephys/tpaa010
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.
eng
Copyright © 2020, Oxford University Press
Genotypic variability in radial resistance to water flow in olive roots and its response to temperature variations
info:eu-repo/semantics/article