Fruit load governs transpiration of olive trees

Tree Physiology
Amnon BustanAlon Ben-Gal

Abstract

We tested the hypothesis that whole-tree water consumption of olives (Olea europaea L.) is fruit load-dependent and investigated the driving physiological mechanisms. Fruit load was manipulated in mature olives grown in weighing-drainage lysimeters. Fruit was thinned or entirely removed from trees at three separate stages of growth: early, mid and late in the season. Tree-scale transpiration, calculated from lysimeter water balance, was found to be a function of fruit load, canopy size and weather conditions. Fruit removal caused an immediate decline in water consumption, measured as whole-plant transpiration normalized to tree size, which persisted until the end of the season. The later the execution of fruit removal, the greater was the response. The amount of water transpired by a fruit-loaded tree was found to be roughly 30% greater than that of an equivalent low- or nonyielding tree. The tree-scale response to fruit was reflected in stem water potential but was not mirrored in leaf-scale physiological measurements of stomatal conductance or photosynthesis. Trees with low or no fruit load had higher vegetative growth rates. However, no significant difference was observed in the overall aboveground dry biomass among groups, ...Continue Reading

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Citations

Oct 5, 2018·Tree Physiology·Michael G RyanRichard H Waring
May 21, 2020·Journal of Experimental Botany·Gregory A GambettaSimone D Castellarin
Oct 22, 2019·Frontiers in Plant Science·Andrea MiserereMaria Cecilia Rousseaux

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