Water stress tolerance is coordinated with water use capacity and growth under water deficit across six fruit tree species

Author:

Opazo Ismael1,Pimentel Paula1,Salvatierra Ariel1,Ortiz Mauricio1,Toro Guillermo1,Garrido Marco2

Affiliation:

1. Centro de Estudios Avanzados en Fruticultura

2. University of Chile

Abstract

Abstract Compare water stress tolerance traits between different fruit tree species under the same experimental conditions can provide valuable information for understanding the mechanisms underlying water stress tolerance. This work aimed to determine and compare the water stress tolerance of six fruit tree species typically cultivated in Mediterranean regions and evaluate its association with water use and growth under water deficit. Six fruit tree species were used in this study: pomegranate, fig, mandarin, avocado, and two Prunus species ('R40' and 'R20'). Iso-anisohydric behavior (low to high water stress tolerance) was assessed through a multi-trait approach and associated with growth and water use under well-watered and water deficit conditions. Avocado and mandarin were classified as species with more strict stomatal control over water potential, while pomegranate, fig, and Prunus spp. showed less stomatal control. This classification was supported by the multi-traits analysis, which showed that avocado and mandarin, in contrast to the rest of the species, were characterized by higher gas-exchange thresholds (more sensitive). A more isohydric behavior was associated with lower water, but higher root hydraulic conductivity, and a lower growth capacity. Some traits, such as the FTSWthreshold to the drop of relative transpiration, root hydraulic conductivity, and residual soil water content, provide valuable information to discriminate between species or genotypes that are better adapted to water deficits. These traits explain the position of the species in the iso-anisohydric spectrum and allow us to understand and develop better strategies for water management in agricultural systems.

Publisher

Research Square Platform LLC

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