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Effect of soil temperature on root resistance: implications for different trees under Mediterranean conditions

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Author
García-Tejera, Omar
López-Bernal, Álvaro
Villalobos, Francisco
Orgaz, Francisco
Testi, Luca
Publisher
Oxford University Press
Date
2016
Subject
GF677
Olive
Radial specific resistance
Rootstock
Transpiration
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Abstract
The effect of temperature on radial root hydraulic specific resistance (Rp) is a known phenomenon; however, the impact of Rp variations expected from soil temperature changes over the tree root system is unknown. The present article analyses the relationship of Rp with temperature in olive ‘Picual’ and a hybrid rootstock, GF677, at five different temperatures, showing that a variation of 3- and 4.5-folds exists for olive ‘Picual’ and GF677 in the range from 10 to 20 °C. The functions obtained were scaled up to show the theoretical changes of total radial root system resistance in a common tree orchard in a Mediterranean climate at a daily and seasonal scale, using recorded soil temperature values: a difference between summer and winter of 3.5-fold for olive ‘Picual’ and 9-fold for GF677 was observed. Nevertheless, Rp changes are not only related to temperature, as cavitation or circadian rhythms in aquaporin expression may also play a role. The results obtained from an experiment with the two cultivars submitted to constant pressure and temperature during several hours exhibited a variation in Rp, but this was of lower magnitude than that observed due to temperature changes. Finally, a comparison of Rp at 25 °C between GF677 and GN15 (another rootstock obtained from the same parental as GF677) showed significant differences. According to our results, diurnal and seasonal changes in Rp due to temperature variations are of significant importance, and it would therefore be advisable to assess them explicitly into soil–plant–atmosphere continuum models.
URI
http://hdl.handle.net/10396/31798
Fuente
Omar García-Tejera, Álvaro López-Bernal, Francisco J. Villalobos, Francisco Orgaz, Luca Testi, Effect of soil temperature on root resistance: implications for different trees under Mediterranean conditions, Tree Physiology, Volume 36, Issue 4, April 2016, Pages 469–478, https://doi.org/10.1093/treephys/tpv126
Versión del Editor
https://doi.org/10.1093/treephys/tpv126
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