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

Tree Physiology
Omar García-TejeraLuca Testi

Abstract

The effect of temperature on radial root hydraulic specific resistance (Rp) is a known phenomenon; however, the impact ofRpvariations expected from soil temperature changes over the tree root system is unknown. The present article analyses the relations hip ofRpwith 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,Rpchanges 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 inRp, but this was of lower magnitude than that observed due to temperature changes. Finally, a comparison ofRpat 25 °C between GF677 and GN15 (...Continue Reading

References

Aug 11, 2000·Journal of Experimental Botany·H CochardM B Bogeat-Triboulot
Aug 12, 2000·Journal of Experimental Botany·M Tsuda, M T Tyree
Apr 1, 1980·Plant Physiology·S W Running, C P Reid
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Nov 1, 1996·Oecologia·R B JacksonE D Schulze

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