Drought tolerance shapes the distribution of plant species, and it is mainly determined by the osmotic potential at full turgor (π 0 ) and the water potential at turgor loss point (Ψ tlp ). We provide a simplified framework for π 0 and Ψ tlp measurements based on osmometer determination of π 0 (π 0_osm ). Specifically, we ran regression models to i) improve the predictive power of the estimation of π 0 from π 0_osm and morpho-anatomical traits; ii) obtain the most accurate model to predict Ψ tlp on the basis of the global relationship between π 0 and Ψ tlp. The inclusion of the leaf dry matter content (LDMC), an easy-to-measure trait, in the regression model improved the predictive power of the estimation of π 0 from π 0_osm . When π 0_osm was used as a simple predictor of Ψ tlp , discrepancies arose in comparison with global relationship between π 0 and Ψ tlp. Ψ tlp values calculated as a function of the π 0 derived from π 0_osm and LDMC (π 0_fit ) were consistent with the global relationship between π 0 and Ψ tlp . The simplified framework provided here could encourage the inclusion of mechanistically sound drought tolerance traits in ecological studies.
A simplified framework for fast and reliable measurement of leaf turgor loss point
Petruzzellis F.
;
2019
Abstract
Drought tolerance shapes the distribution of plant species, and it is mainly determined by the osmotic potential at full turgor (π 0 ) and the water potential at turgor loss point (Ψ tlp ). We provide a simplified framework for π 0 and Ψ tlp measurements based on osmometer determination of π 0 (π 0_osm ). Specifically, we ran regression models to i) improve the predictive power of the estimation of π 0 from π 0_osm and morpho-anatomical traits; ii) obtain the most accurate model to predict Ψ tlp on the basis of the global relationship between π 0 and Ψ tlp. The inclusion of the leaf dry matter content (LDMC), an easy-to-measure trait, in the regression model improved the predictive power of the estimation of π 0 from π 0_osm . When π 0_osm was used as a simple predictor of Ψ tlp , discrepancies arose in comparison with global relationship between π 0 and Ψ tlp. Ψ tlp values calculated as a function of the π 0 derived from π 0_osm and LDMC (π 0_fit ) were consistent with the global relationship between π 0 and Ψ tlp . The simplified framework provided here could encourage the inclusion of mechanistically sound drought tolerance traits in ecological studies.
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